94 SSEi master brake cylinder fails, I think - Page 3 - 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 10-31-2007, 11:07 PM   #21
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Ok, with the car running, mash the brakes with someone else watching the booster line. Does it collapse?
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Old 10-31-2007, 11:29 PM   #22
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No collapsing. I'll try again in warmer weather, though. I don't actually remember that the engine was hot the second time this failed, but it was warmed up the first time.
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Old 11-01-2007, 10:31 AM   #23
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this crap is happening to me all the time too...what is weird is that i had the MC replaced at a dealership and my brakes are still ****...after they replaced it, it was good for a wile but then back to its old tricks...say im at a stop light, and im holding the brake...then the peddle slowly goes down and starts to lose grip..then the car slightly moves forward and i have to re pump the brakes again to get a tight grip...then it happens all over again...it seams tight at first but then gets real lose....i dont know it this is the same thing but i jsut thought im might add and see what happens

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Old 11-01-2007, 10:47 AM   #24
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I'd lose the pretty colored hose and replace it with the stock booster vacuum line. I was once part of the silicone hose club..
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Old 11-01-2007, 02:17 PM   #25
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What Triple X has described isn't what happens to me. Only twice did the brake pedal go all the way to the floor before the car started slowing down. I'm going to replace the blue vacuum tube and see what happens, but isn't that a bit unsafe? I've never gotten the brakes to do this while the car was sitting still.
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Old 11-01-2007, 02:31 PM   #26
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It sounds like a master cylinder...but not many change the vac hoses.
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Old 11-03-2007, 05:57 AM   #27
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I took my car out for a ride while there was no one around. It was kind of like a ghost town, but every now and then a car drove by. The car now consistently does the thing by which the brakes suck, and it also once slowed down but didn't stop until I let go of the brake and pressed again. And every time the brakes went to the floor. Definite master cylinder? I can take care of this soon, and it'* become kind of urgent now because I need to drive this to some classes on Monday. The car seems to drive very well and slows down nicely, but I'm not too comfortable with this.

I have a ride ready if I can't do this in time, but the audio system in my car is far superior and will be missed if I can't correct this braking problem soon enough. I guess now I'm guaranteed to have a bad master cylinder, so I'm cool have no potential discrepancies. Though I still haven't changed out the brake booster vacuum line. I guess it may have become so weak that it now squishes every time, but this is most possibly not the case.
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Old 11-03-2007, 06:38 AM   #28
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If it doesn't do it in the driveway in park and you are definitely not loosing any fluid I would start by troubleshooting the ABS. Have you tried it in the driveway and in gear just like you would be sitting at a stop light? My thinking is that a faulty MC would not care if the car were in park or in gear but the abs would.
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Old 11-03-2007, 12:11 PM   #29
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With his year even if the ABS failed the pedal should not drop to the floor... With a complete ABS failure it would be like a simple pass through for the fluid...

radomirthegreat,

Have you taken the time to check and adjust the rear brakes up? Are the wheel cylinders nice and dry?

Now, like Popatim said... In the driveway with the car running in park can you push the brake pedal and hit the stop?

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Old 11-04-2007, 01:24 AM   #30
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I believe I can push the pedal quite a lot more easily now than before, and even so with the car freshly started and in park. I parked my car somewhere today and with the engine running had the brake pedal squish a bit. It'* fairly easy to press, but the car still slows down just fine. There were two instances in which I slowed down from 50mph and couldn't stop the car just by letting the pedal hit the floor. It needs to be serviced very shortly. I haven't yet taken off the rear drums, but they were done 1 year, 2 months ago or so, and they shouldn't be too rough, nor would they be hard to take off. I'll have a look and let you guys know. Thanks for helping so much, though! This is great.
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