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Old 04-27-2004, 05:08 PM
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Rear disk break problems on camaro

On my 85 Iroc camaro, the rear breaks arn't working (same with the parking break) and it has a very mushy break feel. What is causing this? I've heard that this is a common problem with rear disk breaks on a third gen. Also, is this going to be expensive to fix? Thanks for any help, I need it.

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Old 04-27-2004, 06:35 PM
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give me a brake....
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Old 04-27-2004, 07:33 PM
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If you dont have anything good to say...pis$ off!
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Old 04-27-2004, 08:14 PM
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Don't know about the Camaro disks, but the later Lumina rear disks, which may be the same, were a real bear to work on. The caliper was a real poor design and the parts were expensive.

Your parking brake adjustment is probably the problem. How do the pads and rotors look?
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Old 04-27-2004, 11:28 PM
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Arrow

From -Third Gen.org-

Quote:
A technical service bulletin described this for early-mid '80s rear disk brakes. It seems that the rear disks in these cars would be adjusted by applying the emergency brake. When you pull the emergency brake lever up, the lever turns this little device called an actuator screw. This little screw type device is also on a ratchet, so that pulling the e-brake up, turns the screw. But letting go allows the ratchet part to function and set the pads at that time. So, using the emergency brake is mandatory for maintaining the rear disk setting on early model rear disk units.

But, here's the problem with them. There's a little spring on the actuator screw assembly that allows the pads to back-off from the disk a little bit before the ratchet mechanism is engaged. This must be done, otherwise full brake pressure would be left on the pads when the e-brake is released. Well, that little return spring K-factor was not correctly chosen from the factory, and the result is that the ratchet NEVER functions after the actuator screw gets a little dirty. Hence, the pads simply work their way out all the way when the e-brake is used. Using the e-brake all the time seems to keep the actuator free for a longer period of time, but even with the correct spring weight and screw, the e-brake is required to adjust the parking brake actuator.

The TSB states that cars with a manual tranny are eligible for a free fix as the e-brake is required to park the car, but the auto is not eligible. Why? Only GM knows. However, fixing it yourself should be relatively easy. The rear wheels are removed, and there is a nut on the back side of the brake caliper that holds the parking brake lever. Remove the nut, lever, and soft grommets. Put a large washer over the shaft to act as a spacer, and then put a wrench on the hex of the shaft, and tie it down with the nut. Turn the wrench to back the brakes off. After a while, this will over travel, as if there was a one way clutch. Tighten the shaft to see where the hex is when the pads are tight agains the rotor. If it is in a spot that the parking brake lever will fit, and turn about 1/3 of its travel to tighten apply the brake, then it is good. If not, try again.

This will remove some of the brake pedal slop also. It's supposed to be self-adjusting (apply parking brake thirty times), but it is common for it not to work.
I would try and find a copy of the TSB and go from there.
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Old 04-28-2004, 10:48 PM
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Thanks guys, the calipers and rotors look good poncho, so they must have been working lately but not since winter because when I got my car stuck, trying to move it around my parents yard, with the brakes fully on the back tires where still spinning.
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