C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Need input for brakes on 89

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Old Apr 28, 2009 | 04:06 PM
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Shaybob the builder's Avatar
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From: Acworth Georgia
Default Need input for brakes on 89

Brake pedal slowly going to the floor. If I let up and push back down it will stop but the pedal continues slowly to the floor. No leaks anywhere and no fluid missing from front or rear resevior.

Sounds like bad seals inside master cylinder to me. Before I go buy new master cylinder. Anybody care to chip in their two cents?
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Old Apr 28, 2009 | 04:26 PM
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Sounds like a bad master, also check for cracks in the booster. Disconnect the vaccum hose from booster and plug it up. Check pedal again, should be hard as a rock car running or not. More than likely not the problem but always good to check for this, very common. Good luck!

Last edited by Targa86; Apr 28, 2009 at 04:30 PM.
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Old Apr 28, 2009 | 05:10 PM
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Thats what happened on mine. So, it does sound like a master cylinder. This was several years ago. At the time, it was $600 for a new dealership unit. I hadn't discovered the aftermarket Corvette supplier's yet so I took a chance on a $100 NAPA rebuilt. I'm glad I did.

If you do it yourself, remember there's a special bleeding sequence for anti-lock brakes.
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Old Apr 28, 2009 | 08:57 PM
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Thanks for the input.

I went to Autozone and ordered reman unit for about $160. I'll be sure to check manual for bleeding procedure. Thanks for taking the time to confirm my thoughts. I'll check back in to give update.
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