break issue even after replacing wheel cylinders. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-13-2011, 11:42 AM   #11
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I think you should bleed all 4 wheel cylinders and see what happens. It is an inexpensive and quick proceedure, and will either fix the problem or rule air in the lines out as the cause.

That is a very polite way of saying in the length of time we have been talking about whether or not air in the lines is the problem, you could have bled the lines and found out for sure several times.
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Old 10-13-2011, 11:58 AM   #12
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2K, Bill, And every body else,

Thanks for your patience with me.

2k, The next opportunity to work on the car is Saturday. I'll definitely give it a try then along with looking at the rubber, and keep you guys posted.
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Old 10-15-2011, 11:44 PM   #13
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OK, Bled the brakes. No air came out. Fluid was dark though even though I replaced it last month.

Brakes where a little better but after driving all day, the problem returned.

I have noticed that when I reach a stop, and hold the brakes, then lift slightly and push down it goes further, and I can do it once more and the pedal is on the floor.
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Old 10-17-2011, 08:48 AM   #14
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That would probably be a master cylinder issue at this point.
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Old 10-17-2011, 09:03 AM   #15
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Thx Bill.

I was slowing down yesterday when the car started coasting again, and the pedal pressure disappeared.

Ordered a master cylinder as soon as I got home.

Thanks to everyone for their help.
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Old 10-18-2011, 12:05 PM   #16
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i would unbolt the mastercylinder and check and see if itis leaking out the back into power brake booster if u see any fluid the master cylinder is bad ihave also seen them not leak a drop out the back and still be bad where it will suck air instead of leaking .
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Old 10-18-2011, 12:10 PM   #17
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Any way to test for sucking air? I would imagine the fluid would go low if it was leaking fluid in the booster. Right?
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