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11-21-2012, 03:47 PM
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#16
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Regular Member
Join Date: Jul 2010
Location: ft.worth texas
Posts: 215
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still needing some help guys..
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  SLP lm 1,shift kit,volant ram air,MSD 6AL...UMI panhard rod and LCA's, SLP subframes and strut tower brace,eibach pro drop springs,drilled & slotted rotors, 02 Z06 wheels(gun metal),Brand new interior out of a 2000 SS...needs a dyno..
full bolt on and cam and recent 6 speed swap for A4.
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11-21-2012, 04:20 PM
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#17
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Supporting Member
Join Date: Dec 2011
Location: McDonough, GA
Posts: 551
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I assume since you have a 94 you have a 3 channel ABS, so if it caused one rear wheel to lock up, they both would lock up since there's only one brake line going to the rear axle. Furthermore, the ABS module is not capable of applying more pressure than exists in the master cylinder, and cannot apply the brakes by itself.
Have you tried bleeding the brake line at the caliper? Since both rear brakes get pressure through the same brake line, it points to a mechanical issue (parking brake, caliper, something lodged behind a shoe) unless someone went in there and changed something. It is peculiar that bleeding the ABS released the brake though. Just doesn't make sense. Pressure in the rear brake line would apply both rear brakes.
Sent from my iPhone using AutoGuide.com App
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1995 Firehawk #528 resto-mod underway
Planned 383 rebuild: 195cc competition LT4 AFR heads, custom cam grind (still debating specs), 6" or 5.85" rods, forged internals
Upgraded T56: Viper mainshaft and 2nd gear, steel 3/4 shift fork, Billet keys 1-4, bronze shifter cup, internals Cryo'd and REM'd
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11-21-2012, 04:29 PM
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#18
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Regular Member
Join Date: Jul 2010
Location: ft.worth texas
Posts: 215
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it does apply both rear brakes..last time we messed with it after we drove it we jacked it up and both wheels were locked up..thats when we bled the bleeder on the abs module and it released both of them..
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SLP lm 1,shift kit,volant ram air,MSD 6AL...UMI panhard rod and LCA's, SLP subframes and strut tower brace,eibach pro drop springs,drilled & slotted rotors, 02 Z06 wheels(gun metal),Brand new interior out of a 2000 SS...needs a dyno..
full bolt on and cam and recent 6 speed swap for A4.
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11-21-2012, 04:57 PM
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#19
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Supporting Member
Join Date: Dec 2011
Location: McDonough, GA
Posts: 551
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Quote:
Originally Posted by 94Ztwentylate
it does apply both rear brakes..last time we messed with it after we drove it we jacked it up and both wheels were locked up..thats when we bled the bleeder on the abs module and it released both of them..
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Well that changes everything and brings the proportioning valve back into play.
Sent from my iPhone using AutoGuide.com App
__________________
1995 Firehawk #528 resto-mod underway
Planned 383 rebuild: 195cc competition LT4 AFR heads, custom cam grind (still debating specs), 6" or 5.85" rods, forged internals
Upgraded T56: Viper mainshaft and 2nd gear, steel 3/4 shift fork, Billet keys 1-4, bronze shifter cup, internals Cryo'd and REM'd
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11-23-2012, 05:05 AM
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#20
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Regular Member
Join Date: Nov 2012
Posts: 7
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put the rear of the car in the air, and drive the rear wheels. Just so you can see when the rear is about to start locking up. look at the parking brake setup too. make sure the parking brake is not hanging up and dragging heating up then locking the rear brakes. on your car parking brake is part of the caliper if im not wrong? you said that once you released the pressure in the abs module they unlocked? what about at the caliper?
wierd how you said its fine AFTER 3-4 miles of driving. so the rear brakes dont drag at all until you start driving it then they begin to drag?. need more info 
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99 Z28 M6
Blk/Gry lea. SS clone, SS hood, 10 spoke 17's, R.S. gear built Tranzilla T-56, Hays clutch, SLP Flopac CAI, SLP Loudmouth, Bmr LCA's, UMI APHR, Anzo Halo's, Hurst Billit Short throw.
79 Z28 355/Th400
"1/4 mile at a time, thats just fine"
nitrous till it pukes
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11-23-2012, 10:14 AM
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#21
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Global Moderator
Join Date: Sep 2008
Location: Fruitland Park,Florida
Posts: 6,879
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Since you have both rear wheels locking, the only new thing I can think of is to check the dual piston master cylinder to see if piston for rear brakes may be sticking.
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