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post #1 of 6 (permalink) Old Dec 18th, 00, 12:59 PM Thread Starter
 
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I have a 68’ Z/28 Camaro with front 4 piston caliper disc brakes and rear drum brakes. I sent the calipers out for overhaul and put new shoes on the rear. Replaced the master cylinder and bench bled. Pressure bled all the way around 3 times. The system builds pressure when you pump them up, but then bleeds off after you release the pedal and apply the brakes again. The pedal then goes all the way to the floor. Do you have any suggestions?
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post #2 of 6 (permalink) Old Dec 18th, 00, 01:04 PM
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We had a similar problem with a 69. Root cause was the repro brake lines. The line at the rear of the junction block would draw in air but not leak fluid. Hated to do it but all joints are now teflon taped and are as tight as possible.
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post #3 of 6 (permalink) Old Dec 18th, 00, 04:12 PM
 
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I just had a problem like this on my cavelier (i know not a camaro) the cause of my problem was also the new brake line that I put on. The fitting that went into the wheel cylinder was to short and let air in and didn't leak. I went to a mechanic that really knows his stuff and he gave the the correct brake line.
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post #4 of 6 (permalink) Old Dec 18th, 00, 06:24 PM
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Make shure the rear shoes are very close (just touching) to the drums or it will cause a low pedal.
Did you adjust the rear shoes?
David

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post #5 of 6 (permalink) Old Dec 20th, 00, 01:15 PM
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Do you have a residual pressure valve? Some aftermarket and later OEM master cylinders do not have this. On the return stroke considerable vacuum can be developed in the brake lines, sucking air in through the wheel cylinder seals.
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post #6 of 6 (permalink) Old Jan 1st, 01, 05:09 PM Thread Starter
 
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We had the front calipers on the wrong sides.Swapped them over and the pedal came right up.The bleeders were lower than the brake lines so everytime we bled them,we just put more air in the system.Seems strange they bolted up and the brake lines fit.Thanks for the input John <BLOCKQUOTE>quote:</font><HR>Originally posted by johnrose:

I have a 68’ Z/28 Camaro with front 4 piston caliper disc brakes and rear drum brakes. I sent the calipers out for overhaul and put new shoes on the rear. Replaced the master cylinder and bench bled. Pressure bled all the way around 3 times. The system builds pressure when you pump them up, but then bleeds off after you release the pedal and apply the brakes again. The pedal then goes all the way to the floor. Do you have any suggestions?
<HR></BLOCKQUOTE>

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