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Old 08-02-2011, 05:01 PM
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HELP HELP can't figure out failing brakes more than confused!!

ok here we go, i've owned this car since 1984 this is a 69 camaro disc front drum rear. i restored the car in 1993 and changed the rear from a 10 bolt to a 12 bolt rear 3.31. had the front end off replaced all the brake lines, hoses, cylinders, master, booster, the list goes on. since the restor. i can use the car after bleeding the system for about 6 times or possibly 100 miles? and the brake pedal gradually gets lower to the floor board til eventually there is no pedal and no brakes at all. at this point the master is totally full of fluid, no signs of leaks at all. i can bleed the brkaes either with a bleeder ball or the old fashinoed way and get air coming out of the lines. then some brakes and the process starts all over again. it seems that this started after changing the rear end? like i mentioned all the brake parts have been changed in fact the i'm on my 3rd master if i recall? we love the car in fact it is beautiful but hard to use with no brakes any ideas i'm listening thanks so much look forward to your responses.

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Old 08-04-2011, 12:04 AM
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A few ideas - try this

1. I had the same problem with one of my cars and it turned out the actuating rod of the master cylinder was not coming back all the way when you took your foot off the brake pedal. Check the pedal, linkage, master cylinder to make sure the pedal is coming all the way back on release.

2. It sounds like your master cylinder may be leaking internally. You said you have had 3 different ones on the car. If they were rebuilt master cylinders that can sure be an issue. If the rod is coming back all the way, I would try to find a completely new master cylinder instead of the rebuilt version. I had this problem on another car of mine. I had two bad rebuilt master cylinders in a row, then went to the new one and that solved the problem.

3. Use a different method of bleeding the brakes. If your master cylinder is in the stock location, it should be higher than your wheels. If this is the case I would try gravity bleeding the brakes. I have found this is a much better method for getting rid of air in the brake system.

4. In an effort to locate the problem, bleed the system of air until you have a firm peddle. Cut a piece of lumber the right length and place it between the brake pedal and the seat so that it will maintain pressure on the system. Check the level of the master cylinder and clean all fittings, then let it set up over night. Get a good light and check everything the next day for loss of fluid, leaks, pressure on the pedal, etc.
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Old 08-04-2011, 07:27 AM
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Years ago I had an older Vette in the shop doing this and it was drawing air past the seals in the brake calipers when the brake pedal was released. Bleed it, good brakes. After a few days, full of air with air coming out of the brake bleeders. That one eventually required all new calipers.
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Old 08-04-2011, 05:28 PM
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I had a Olds 88 that would not bleed out even with a pressure bleeder. Left the master cylinder cap off and the bleeds open..... That was the only thing to ever given me such a problem..... Up, Down for years then a professional bleeder that held over 1 gallon of fluid... All disc break cups rebuilt, and wheel cylinders rebuilt. All rebuilt by me.... I have done 100's of them.

So this might be worth a try.
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Old 08-04-2011, 05:45 PM
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Quote:
Originally Posted by PapaG
I had a Olds 88 that would not bleed out even with a pressure bleeder. Left the master cylinder cap off and the bleeds open..... That was the only thing to ever given me such a problem..... Up, Down for years then a professional bleeder that held over 1 gallon of fluid... All disc break cups rebuilt, and wheel cylinders rebuilt. All rebuilt by me.... I have done 100's of them.

So this might be worth a try.
X2 This Has worked for me also.



Cole
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