1994 Bonneville Brake Problems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-12-2009, 05:39 PM   #1
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Default 1994 Bonneville Brake Problems

Now that I (excuse me, I mean we, and you know who you are, and if you don't know, it'* Danthurs) got it started, the brakes seem to be a little stubborn from sitting for a year and a half. Way low on fluid, you can see where the fluid leaked out. It leaked out between the master cylinder and the vacuum booster. You can see the big stain mark down the front of the booster. I had this problem not too long ago and replaced the master cylinder, so it'* fairly new. The problem is that I have basically no pedal, you have to pump them a couple of times, now I realize it needs to be bled, but even after bleeding the next day it'* mushy again. Also after you pump it and it begins to stop the driver front brake caliper locks up to stop the wheel. Where should I start, New Vac Booster?, new caliper or rebuild the one there? flush lines? please let me know you ideas. Thanks 2ringer6
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Old 02-12-2009, 06:43 PM   #2
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Replace the drivers side. I suspect a bad piston and that'* letting air in the system. Also, a total change of the brake fluid. I'm sure I did a write up on changing the master cylinder. Here it is.

https://www.gmforum.com/t279220/
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Old 02-13-2009, 04:07 PM   #3
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What do I do about the leak between the master cylinder and the vacuum booster?
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Old 02-13-2009, 04:27 PM   #4
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You need to determin where it'* leaking. After you remove the master cylinder you can then see if you can rebuild it, or have to replace it.
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Old 02-13-2009, 06:53 PM   #5
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I replaced the master cylinder not long ago, do they start leaking again so quickly. Could it be the booster?
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Old 02-13-2009, 06:55 PM   #6
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Is it brake fluid that'* leaking? You will need to inspect the master to see if you can find the leak.
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