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  #1  
Old 09-24-2012, 10:44 PM
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Default Rear disc brake conversion kits?

Does anyone know of a rear disc brake conversion kit?
Is it do-able and worth it? Will ABS still work?
I need to do the rear brakes on my truck and this came to mind, I can't do it now, it just came to mind.
Thanks
Rick
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Old 09-24-2012, 11:05 PM
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There are a couple out there, but what I don't like is they use GM parts....sucks for me.
You may like them so just Google it and you will see them:
Blackbirds and TSM.

What I did on my 86 was had a machine shop cut 2 rings that I welded on to my axle tubes to allow me to bolt on the same calipers I had up front.
They only cost me like $80.

So now I have all 4 corners using the same parts...it's cool.
I also added a Wilwood adjustable line pressure valve for the rear so I could equalize things myself.
My next addition is hydro boost running off the power steering.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-24-2012, 11:20 PM
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That's a good idea, but how did you get the rotor on the axles. It would be nice to use the same pads front and rear. Do you think they'd work under a heavy load?
Do you need to remove all the internal parts to keep them from possibly welding them if there is an arc inside?
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Old 09-24-2012, 11:24 PM
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They work incredibly well.
The rotors are just off the front and slip over the rear IIRC.
I will have to do some research with my receipt folder to see what I did there.
I will take some pics and post them.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-24-2012, 11:37 PM
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Am I right in assuming I want to use rotors from a 2wd front on the rear?
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Old 09-25-2012, 12:29 AM
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The rotors used in the kits are from a 2000 single rear wheel E-350 van (Motorcraft BRR-71, about $85 each at RockAuto). The Blackbird and TSM kits use the 70's Caddy El Dorado rear calipers for the parking brake provision or the 1/2 ton Chevy pickup fronts if you don't want parking brakes. As Rosyruby says, the problem seems to be the 1/2 ton calipers are not heavy duty enough for use on a F-250/350 and some have had rear axle seal problems.

There has been a couple of writeups for adapting the SD rear disc/calipers to the OBS axles on other forums, all different in approach. This gives you a HD caliper/parking brake without any downside.

The F-SuperDuty hydroboost conversion has been written up on PSArmy complete with pictures and parts numbers and there is another writeup on PSNation about the factory proportioning valve. You may want to do this before converting to rear discs.
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Last edited by old man dave; 09-25-2012 at 12:39 AM.
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Old 09-25-2012, 01:07 AM
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I am installing a driveline parking brake on mine.
If you get the hydro boost system from a 1990-91 F450 SD, it's a bolt in on an OBS.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-25-2012, 01:27 AM
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Quote:
Originally Posted by rosyruby View Post
They work incredibly well.
The rotors are just off the front and slip over the rear IIRC.
I will have to do some research with my receipt folder to see what I did there.
I will take some pics and post them.
Pics please because if It can be done with out a kit then I think it would be worth it.

What is the real benefit with hydro boost when just adding disc to the rear?
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Old 09-25-2012, 04:46 AM
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Quote:
Originally Posted by Fattz View Post
Pics please because if It can be done with out a kit then I think it would be worth it.

What is the real benefit with hydro boost when just adding disc to the rear?
Pics will come tomorrow when I get loose.
You can add hydro boost to drums or disc, it just give you a lot more pedal power to stand on.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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  #10  
Old 09-25-2012, 03:06 PM
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Doug, are you sure about the years on the F-450? A friend of mine has a 92 2wd that he's considering parting out. Said I can have what ever I need.
How does a driveline p-brake work? Will it allow the truck to move at all if engaged? I think a p-brake should not allow the vehicle to move until released. Old man Dave, Thanks, good info. I'll check into the hydro boost.
Fattz, I'm with ya brother. If I have to turn the drums,or replace them, the springs and wheel cylinders, it may not be much more to find the parts and convert it over.
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Old 09-25-2012, 03:54 PM
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Quote:
Originally Posted by ridgerunner View Post
Doug, are you sure about the years on the F-450? A friend of mine has a 92 2wd that he's considering parting out. Said I can have what ever I need.
How does a driveline p-brake work? Will it allow the truck to move at all if engaged? I think a p-brake should not allow the vehicle to move until released. Old man Dave, Thanks, good info. I'll check into the hydro boost.
Fattz, I'm with ya brother. If I have to turn the drums,or replace them, the springs and wheel cylinders, it may not be much more to find the parts and convert it over.
The drive pin into the booster is longer on the later years, but not sure when they did it....could be 99+
Just check with a local parts store like Oreilly or NAPA and even Ford themselves for P/Ns on the different years.
They all bolt up to the firewall no problem, but the shaft is 2 different lengths.

Go ahead get all the stuff if for nothing else than the hoses and pump.
Even the booster and master cylinder are the same.

Yes, the drive shaft parking brakes work very well, in fact they use them on F450,550 tow trucks and busses, so go figure.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-25-2012, 05:15 PM
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Drive line parking brakes keep the drive shaft from spinning. It looks like a bike disc with a mini caliper. There are also used in the off road community.
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Old 09-25-2012, 06:04 PM
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Here's the disc brake setup.
A little rusty because it's been sittin for a couple of years.

Here's the link to the tilt front-end in PB:
http://s1052.photobucket.com/albums/...20Front%20End/
Attached Images
File Type: jpg IMG_6669.jpg (105.0 KB, 27 views)
Highslide JS
File Type: jpg IMG_6670.jpg (101.8 KB, 24 views)
Highslide JS
File Type: jpg IMG_6671.jpg (92.5 KB, 23 views)
Highslide JS
File Type: jpg IMG_6672.jpg (115.1 KB, 28 views)
Highslide JS
File Type: jpg IMG_6674.jpg (98.9 KB, 26 views)
Highslide JS
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Doug
86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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  #14  
Old 09-25-2012, 06:13 PM
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Thanks Doug I will check it out when I get home tonight. Work won't let me on the site anymore for some reason.
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  #15  
Old 09-25-2012, 06:18 PM
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They feel abandoned and neglected like a wife
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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  #16  
Old 09-25-2012, 06:23 PM
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Lol! Im sure I have been using my phone but it uses a lot of battery.
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Old 09-26-2012, 01:05 AM
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Quote:
Originally Posted by rosyruby View Post
I am installing a driveline parking brake on mine.
If you get the hydro boost system from a 1990-91 F450 SD, it's a bolt in on an OBS.
Apparently, the F-Superduty OBS trucks up to and including 1997 are suitable. If you only install the hydroboost unit without changing to the rear disc master, you have to slot the mounting holes in the F250/350 master a bit to fit. You have to make sure you get the actuator rod for the hydroboost unit since it is not sold separately and not all of the new/rebuilt units come with the rod. The Motorcraft BRB-37 hydroboost unit does come with the actuator rod (the two units I bought did), the others listed at RockAuto, who knows?.
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Old 09-26-2012, 01:22 AM
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Quote:
Originally Posted by ridgerunner View Post
Doug, are you sure about the years on the F-450? A friend of mine has a 92 2wd that he's considering parting out. Said I can have what ever I need.
The Power Steering pump reservior has another tit on it for the fluid return from the hydroboost, so grab it or you could just tee into the current power steering return hose and keep your stock pump. Also, the hydroboost unit and actuator rod and disc brake master. On your '97 truck there is a build date difference in one hose, Aug.10,1997 and earlier and Aug.11,1997 and later, the steering gearbox hose fitting changes. Both hoses are still available for the hydroboost.
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Old 09-26-2012, 01:49 AM
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Went over to PSArmy and dug up the parts numbers from RockAuto

F-Super Duty 1997 7.3 Power Brake (hydroboost). RockAuto starts listing the F-Super Dutys using the hydroboost system in 1990 to 1997. The new SuperDuty truck hydroboost system is not directly interchangable with the OBS.

Motorcraft
Power steering pump STP56RM
Power Brake Booster BRB 37 (with actuator rod)
Disc Master Cylinder BRM39

Gates hoses
pump to hydroboost 366200 (or ACDelco 3636880)
bulk hose, return 5' 350010

hydroboost to gearbox
Aug.10, 1997 or earlier 365930 (or ACDelco 36365930)
Aug.11, 1997 or later 352810
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Last edited by old man dave; 09-26-2012 at 02:00 AM.
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Old 09-26-2012, 08:11 AM
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Nice homework Dave!!
Thanks for the info
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-26-2012, 11:36 AM
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Wow!! Thanks Dave, Great info. I have a message on my friends fb to give me a call. He's a machinist too, so he may be able to get those rings for me. What does the OD on those need to be? Is Mild steel what I need or something harder?2wd front rotor? How thick is the ring? looks like 3/8"
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Old 09-26-2012, 01:01 PM
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I can measure them for you, but yes, I believe they are 3/8" mild steel.
They are the same OD as the caliper bracket ring.

After we turned them on a lathe, I simply laid them over the caliper brackets to mark the holes.
To plane them, I bolted the rotors in place and used c-clamps and sockets in 4 places to position the rings correctly.

You will need to cut the old rings off and grind the axle tubes clean.
Just be careful not to over heat or cut the tube ends with the torch.

As you can see, these are a lot more meat than the wimpy GM crap for sale out there.
In fact, I would bet you would be better off sticking with your drums than to make the switch to the chicken wire and paper mache... LOL
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-26-2012, 04:13 PM
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I'm with ya on the chicken wire and paper mache!
I just talked to my buddy and he asked, since his f450 has rear disc brakes, why can't I use those? If the rotors will fit on the axles I can make the rings and brackets work. His wheel size is the same I'm thinking the part that would make a difference is the bolt pattern, He lives about 100 miles away so I can't line 'em up, but I'd think they would be the same. Turns out the truck belongs to him and his father, they're debating whether to fix it or take the front off and make a trailer from it. I'm voting make a trailer from it
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Old 09-26-2012, 05:40 PM
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Won't work, The f-450 has 10 bolts.
Mine has duals on the rear, but, they weren't originally. The previous owner put some aluminum discs on the drums and they have the lug studs on them to give the extra clearance. They are removable and I can put them on the rotors I put on the rear.
I have no torch, I'd have to use a cutting wheel or just grind it.
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Old 09-26-2012, 06:19 PM
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You can just grind the welds, just takes a little longer.

Here's the P/N for the rotors I used:
E8TZ-1125-A
I paid $94 a piece, but that was at the Ford dealership....so cross them at NAPA or Oreilly.

I don't recall what hey came off of, but they fit just fine in place of the drums, so that's all I cared about. Maybe Andrew can look them up or you can call another dealership.

All of the other parts like the calipers, pads and caliper brackets are for the 86 F350 front D60 with king pins.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 09-26-2012, 08:22 PM
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The rotor used in the TSM and Blackbird kits is from the 2000-2006(?) E-350 single rear van. The nice thing is the 2000 vans still used the Dana rear axle and not the SuperDuty late metric Sterling 10.25. The van Motorcraft BRR-71 rotors bolt right onto the OBS inch Sterling rear axles.
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Old 09-26-2012, 08:31 PM
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Dave,
Good point and they are prolly the same P/N as the one I posted.

The late model Sterling is a 10.5.
The OBS is the 10.25

The real difference related to this project is the lug pattern.
Old is 8 x 6.5"
New is 8 x 170mm

BTW, Ford says the E8TZ-1125-A was replaced by:
YC3Z-1V125-DA

So what I found out is, this rotor fits the following trucks:

1991 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1991 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl
1992 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1992 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl
1993 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1993 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl
1994 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1994 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl
1995 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1995 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl
1996 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1996 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl
1997 FORD-MEDIUM DUTY F-SUPER DUTY V8-460 7.5L
1997 FORD-MEDIUM DUTY F-SUPER DUTY V8-446 7.3L Dsl

I am now going to research to see if the rear end will interchange as well.
That would be the easiest thing to do, one would think.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.

Last edited by Doug; 09-26-2012 at 08:42 PM.
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Old 09-26-2012, 08:40 PM
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Thanks Doug and Dave, I'm wanting to at least use the same pads in the rear as the front. The front caliper bracket I have would need a ring almost as big as the rotor to bolt in. As soon as this rain stops, I'll get pics of the front and rear with the wheels off. I'm wimpy, don't feel like wollerin' around in the gravel driveway in the rain. s'posed to stop tomorrow.
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Old 09-28-2012, 12:10 AM
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The F-350 van single wheel Dana inch rear rotor has the same bolt pattern as the drum 10.25 OBS inch rear axle so the rotor is a drop-in. The vans did not switch over to the metric Sterling axle until about 2007.
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Old 09-28-2012, 02:59 AM
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I would still need this disc to keep duals on the back. Now I don't think I'll have time to switch over to disc brakes, I got a call today about a job and I'll have to travel, but I need it bad. I've got to get this back together and get a clutch in so I can go. I'll be working on turbines again and usually there is a week or two between jobs and this info will be here and I'll have more $$ to do it right.
The E-350 discs sound like the way to go. I'll have to look up the calipers and brackets to see what I need to make.
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Old 09-28-2012, 06:00 AM
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Mico is the name of the co that makes a popular disc brake drive line park brake
Very strong and uses cable actuator
Popular on older cat forklifts
10000# and 12000 # trucks
Models Tcd and Tdm I think
Not even to bad in
Price I think the caliper and pads are under 200.00 $ up here


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Old 09-28-2012, 06:27 AM
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Thanks Machzx
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Old 09-28-2012, 06:33 AM
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THX Ed,
That's the one I have.
I looked thru my receipts but couldn't find it, but the Mico is a great product and an easy install. There's just no markings on mine.
Just Googled "Mico parking brake".

It still seems like there is a 10.25 axle a guy could buy and just do a swap....either the van or the OBS SD. I am going to research it and report back.
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86 F350 4x4 - Original owner
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Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
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Old 09-28-2012, 04:48 PM
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So Doug just for clarification..

You cut off the square flanges that hold the drum backing plate on, made round flanges and welded them on in the square flange place, drilled holes in the new flanges to match the stock front caliper brackets right? Is the caliper bracket mounted in front of the new flange?
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  #35  
Old 09-28-2012, 05:15 PM
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Square plug round hole
Geez


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  #36  
Old 09-28-2012, 06:20 PM
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Quote:
Originally Posted by Fattz View Post
So Doug just for clarification..

You cut off the square flanges that hold the drum backing plate on, made round flanges and welded them on in the square flange place, drilled holes in the new flanges to match the stock front caliper brackets right? Is the caliper bracket mounted in front of the new flange?
Yes, what you make is a simple ring with holes in it.
The caliper bracket is on the outside of the new flange.

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Originally Posted by machzx View Post
Square plug round hole
Geez
The axle tube is round, just the factory flanges you cut off are square.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 12-10-2012, 02:53 AM
BarNoneDiesel BarNoneDiesel is offline
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Quote:
Originally Posted by ridgerunner View Post
Does anyone know of a rear disc brake conversion kit?
Is it do-able and worth it? Will ABS still work?
I need to do the rear brakes on my truck and this came to mind, I can't do it now, it just came to mind.
Thanks
Rick
Recently did a retrofit on a 97 f350.

We used e-series van rear components, as an idea that we took from threads on the net. FordMann, and Peroni did the conversion(he followed Fordmann, who is first known to have done it). We initially created a disc brake flange to match what the e-series had but decided to do it a different way. We went ahead and used the stock drum brake flange, and just boxed it in to the width of the eseries backing plate. We then cut the stock drum brake flange to the shape of the eseries van one and then drilled holes. It bolted up great and of course the bearing spacing was right where we needed it to be. The pedal did get a bit more spongy, but the long term goals are to convert over to hydroboost, and stainless braided lines. Best of all is that all stock parts were used and they were designed to stop something heavier than a car. The mod is one of the best on an OBS.
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Old 12-10-2012, 02:55 AM
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Quote:
Originally Posted by Doug View Post
THX Ed,
That's the one I have.
I looked thru my receipts but couldn't find it, but the Mico is a great product and an easy install. There's just no markings on mine.
Just Googled "Mico parking brake".

It still seems like there is a 10.25 axle a guy could buy and just do a swap....either the van or the OBS SD. I am going to research it and report back.
SD axles change the rim over to metric, so unless you do the front it means two different sets of rims or, spacers. Van axles are a downgrade from the Sterling.
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Old 12-10-2012, 06:01 AM
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Do you have pics?
That's the E-ticket here...
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 12-10-2012, 10:44 AM
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I think I am going to go with the hydroboost deal. I am worried about the calipers clearing the duals since I have converted my SRW to DRW I can see some issues jumping up. I am one of those guys that has luck like that, LOL.
I need to get my up-pipes fixed first, they are priority #1 for my piggy bank now.
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  #41  
Old 12-10-2012, 02:49 PM
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The kits I have looked at use rear rotors from a SD van which use the 8 on 6.5 bolt pattern and use calipers and brackets from a dana 44 late 70's chevy 4x4 which are bigger than SD calipers

Seemed like a inexpensive to get rear disc brakes
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  #42  
Old 12-11-2012, 01:02 AM
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Quote:
Originally Posted by KWT2000 View Post
The kits I have looked at use rear rotors from a SD van which use the 8 on 6.5 bolt pattern and use calipers and brackets from a dana 44 late 70's chevy 4x4 which are bigger than SD calipers

Seemed like a inexpensive to get rear disc brakes
It depends. TSM or Blackbird customs usually give two choices one being the caliper you describe (with no provisions for a park brake, as it is a front caliper) or a Cadillac rear caliper, which does have an integrated, ratchet style park brake. I was going to try that option and then I was really worried about the stopping power of using a car caliper, on a truck that may haul a large amount of weight.

Sure someone can get into the proportion ratio between front and rear, but even with going to a rear disc conversion, it is a better idea to go with a hydroboost setup which is proportioned for running rear discs (if you choose an f-superduty, version).


From my understanding there has been some issues with the park brake on those calipers not working correctly (a lot of it is user error from what I've heard).

The way I did requires a lot of work, and skill with welding. But it uses all factory Ford parts, made for a much similar class of vehicle. There are already good writeups on the style of rear conversion I did, but for ya'll considering it would pics help?
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  #43  
Old 12-11-2012, 02:26 AM
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Should have my Blackbird kit in a few days. I never use my parking brake, but I believe it has something there.
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Old 12-11-2012, 03:26 AM
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Quote:
Originally Posted by Terminator Engineering View Post
Should have my Blackbird kit in a few days. I never use my parking brake, but I believe it has something there.
They do top notch work and like I said I was real close to purchasing from them. If it is the Cadillac caliper it will have a park brake, from what I've heard they are getting super pricey on core charges for those things.
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  #45  
Old 12-11-2012, 07:42 PM
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Quote:
Originally Posted by Terminator Engineering View Post
Should have my Blackbird kit in a few days. I never use my parking brake, but I believe it has something there.
Been looking at there kit for years. Let us know how you like it.
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  #46  
Old 12-11-2012, 11:04 PM
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Would you guys be interested in a factory Ford disc brake kit?
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  #47  
Old 12-11-2012, 11:24 PM
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Yes, how would that work?
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86 F350 4x4 - Original owner
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Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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Old 12-11-2012, 11:34 PM
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Quote:
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Been looking at there kit for years. Let us know how you like it.
We'll do.
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Old 12-12-2012, 08:15 PM
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Quote:
Originally Posted by BarNoneDiesel View Post
Would you guys be interested in a factory Ford disc brake kit?
If it is priced right and was bolt on. Whacha got?


Quote:
Originally Posted by Terminator Engineering View Post
We'll do.
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Old 12-12-2012, 08:25 PM
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I would like to see something put together for all ford part kit?
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  #51  
Old 12-12-2012, 09:19 PM
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I think maybe he is talking about a custom bracket that would use Ford parts.
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86 F350 4x4 - Original owner
Was a 460 and will be a 00 SD 7.3, 550HP
Superlift 6", tilt front-end, dump bed, ARB lockers front and rear, 4 wheel discs, E40D

97 F350 PSD
E4OD, stock DD.
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  #52  
Old 07-23-2013, 01:53 AM
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A late followup for those interested in installing the F-SuperDuty hydroboost into a F-250-350.

Got4WD discovered that the F-SuperDuty uses a different pedal box assembly than the F-250-350 trucks. He looked at several F-SuperDuty brake pedals and saw there was a difference. The point where the master cylinder linkage attaches to the brake pedal is in a different location that reduces the leverage of the brake pedal resulting in reduced braking performance and a hard pedal. The cure is to relocate the pin on the brake pedal closer to the pedal pivot point by about an inch. All of the details are in a sticky on PSArmy as a sticky in the OBS aftermarket section.
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  #53  
Old 07-24-2013, 07:16 AM
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Nice thanks Dave.
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  #54  
Old 11-13-2013, 04:01 AM
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When switching to rear discs, the 4 disc proportioning valve is F8-2C161-AA. It mounts inline between the master cylinder and the brake line and replaces the 2 disc/2 drum proportioning valve.

The brake pedal linkage pin has to be relocated 2-5/8" center to center from the pedal pivot when using the hydroboost unit. The original location of the F-250/350 pin is about 3-1/4" and does not give enough leverage to make the hydroboost unit work. There were complaints about a hard pedal until Got4wd found several original F-SuperDuty trucks and measured the distance of the pin to the pedal pivot.
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