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Old 12-11-2002, 08:41 PM
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Post drum to disc (85 camaro)

Last year i put in a 198x Trans am rearend. IT was a 9 bolt borg & warner with 3.23's or something in that ball park. The car had a 85 camaro 3.08 open rearend. It blew and i got a good deal on the Trans am rearend with calipers, and master cylinder & portioning valve. The only thing i dont have is the break lines on the the rear end. I have the blocked off right before the rear axle. Any idea what i can do to make these breaks work ? Can i get a custom line, maybe something out of "plastic" ( not really , but something bendable to create my one hose/line) I would also need something to screw into the back of the caliper to seal the pressure.. Anyone have any idea?

Front breaks suck! <img src="graemlins/pain.gif" border="0" alt="[pain]" />

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Old 12-11-2002, 09:36 PM
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you do know that you have to fix the propotioning vavle cuz gm messed up when they did this break setup and they had less stopping power than rear drums
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Old 12-12-2002, 04:57 PM
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I have read and re-read this post several times trying to understand it. I think he is saying that he is operating the car without rear brakes...

[quote]The only thing i dont have is the break lines on the the rear end. I have the blocked off right before the rear axle. Any idea what i can do to make these breaks work ? Can i get a custom line, maybe something out of "plastic" ( not really , but something bendable to create my one hose/line) I would also need something to screw into the back of the caliper to seal the pressure.. Anyone have any idea?

Front breaks suck!<hr></blockquote>

Uh...You will either have to make the steel lines that run along the rear axle tubes away from the juction block or find another donor car. They are what deliver brake fluid pressure to the calipers.

You are going to have to use the disc/disc master cylinder and proportioning valve off the FIREBIRD to have balanced braking.

Either go to a GM dealer and have the parts guy burn you some illustrations of how the brake lines are routed or find another donor car to get the pieces!
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Old 12-12-2002, 05:07 PM
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I swapped a 9 bolt into my 82 camaro.I cut the hard line going to the back of the car and used a compression union{not the right way to do it}to splice the line to the disc brake line end.I know that after a few hard passes at the back road raceway{this was a long time ago}the front brakes were smoking,which leads me to believe they were doing most of the stopping.I thought that the entire setup was wrong.A few years later I owned an 89 GTA with disc brakes from the factory,and just like my 82 camaro,the rear brakes did nothing.In the snow,I found that even at idle the rear wheels would spin at a stoplight even when I applied the brake as hard as I could.I put the car on a lift and found that the rear brakes didnt do anything.I would have been concerened about this,but I had an 84 trans am with factory drums in the rear,and if you tapped the brakes on wet pavement the car would switch directions instantly,so I determined that strong rear brakes on an 82 and up Fbody are not only not needed,but might be less safe the having good brakes.BTW,dont let anybody knock that 9 bolt.I ran mine into the 12's with a 406 smallblock on nitous inmy 82 camaro,and ran the butt off my GTA without any trouble.I am trying to get the guy who bought my GTA to sell it back to me when he is ready to sell it.I was thinking that mayne a nice tremec 5 speed or T56 behind the warmed over 350tpi would be nice.BTW,my 82 camaro had an early 9 bolt which used calipers similar to the front calipers of the camaro,while my GTA used the mini calipers.Good luck.
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Old 12-12-2002, 05:18 PM
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Like I said GM screwed up from the factory... they did an investigation so they could do a recall but found nothing... one of gms top mechanics finally found a solution but because it was in his spare time gm never did a recall... I remember seeing a site somewhere on how to fix it (the proportioning valve was the problem) although I never cared cuz I don't have rear discs and most likely won't for a long time
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Old 12-12-2002, 09:52 PM
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If that is the case (rear brakes not working or overly agressive) an adjustible proportioning valve should cure the problem.

Their are pressure gauges available to properly diagnose and setup any brake application.

Not running four wheel brakes is not the solution.
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Old 12-14-2002, 04:05 PM
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The problem is that the cars are unsafe.GM designed a rear suspemntion system that is designed to lift the rear tires off the ground under heavy braking.I have yet to see one of the cars that was safe to drive in the rian.I have owned many of them,but never as a daily driver.My 89 GTA had no rear brakes,but it wasnt much better then the drum brake cars that I had that worked.All of them would go sideways when negotiationg a turn at 5 mph on wet pavement.GM has horrible brake problems.We have an entoire fleet of GMC chassis cab trucks in work,and ever since the HD3500 was first made{maybe '91}.they all will skid for hundereds of feet in the rain.The front brakes lock up on even the least bit of damp pavemnt.GM never found out why,but they admitted all the trucks are pretty much usafe.We did know how serious this was until one of our guys rear ended a brand new Town Car with {you guessed it} a lawyer behind the wheel.This lawyer guy used his resources to find out why the truck skidded for 200 feet when even he knew it was only going 20 miles per hour.It turns out GM had know of this problem,but never issued a service bulletin on it.You can adjust that propotioning valve t the screw wears out,you still wont have a 3rd gen camaro that stops worth a crap on wet pavemnt.
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Old 12-14-2002, 04:10 PM
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Yup as far as I know you have to completely redo the brakes with aftermarket or 4th gen parts.... TOOO much money.. but if he wants 4 wheel discs that bad then great... I really don't give a damn how well I stop.... just always look ahead and do the speed limit and you should be pretty safe... oh yeah and keep your distance... hehe I'm a driving instructor now...
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