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Old June 5th, 2008, 08:09 AM   #1
mudduck97
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rear disc brake

is there any gm part that i could use to convert my 85 rear axle brake drum to disc brake? i have rotor and caliper from 89 chev half ton which has same bolt pattern as toyota but the center hub is smaller than the toyota... i was thinking have machine shop to make the center hub fit the toyota but i thought i d check with ya all out here see if you guys know something that i could of done better than what i plan to thanks
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Old June 5th, 2008, 10:47 AM   #2
Haggar
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Yeah, you can bore those out I believe to use them. None just bolt on. Then use GM midsize car front calipers (or eldorado calipers for ebrakes).

I use Toy front discs on the back, mounted on the backside of the axle flange. Even then I needed to open up the center hole with a 4.5" grinder.

My system works very very strong, and has good bias and pedal feel/travel:

Toyota Supra dual diaphram booster with 1"/1" disc/disc master from the same car.
Summit racing adjustable prop valve
front: FJ40 vented rotors with 89 V6 4-runner 'big' calipers, ground to fit inside 15" rims
rear: solid axle front rotors with front axle small calipers

You get a lot better bias/hydraulic ratio from front to back with this setup, compared to the GM calipers in the rear, which have a larger piston area, which unbalances the system...
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Old June 20th, 2008, 10:53 AM   #3
incogrhino
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doing my rear disks on my project cruiser I used a fj80 master, a fj60 booster, chevy 1/2 ton rotors turned out the I.D. to fit over my rear axle flange, and monte carlo calipers.But it's not on the road/trail yet.Still in the project stage.
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Old June 20th, 2008, 11:28 AM   #4
roll-bar Bob
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This is how I did Mine


http://ttora.com/forum/showthread.ph...ear+disc+brake

It was cheep and they work great
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