3rd Master Cylinder. - 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.

View Poll Results: How rediculas?
Very 2 40.00%
Not totally 0 0%
Sell your Bonneville and buy a Ford 0 0%
Just dont use your brakes 3 60.00%
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Old 10-11-2004, 03:51 PM   #1
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Default 3rd Master Cylinder.

How rediculas is it that Ive gone thru 3 master cylinders in just a few years... all of the seals go bad and they leak out the back... Rediculas...
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Old 10-11-2004, 04:06 PM   #2
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yes that is rather "ridiculous"
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Old 10-11-2004, 05:06 PM   #3
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Buy a different brand.
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Old 10-11-2004, 06:01 PM   #4
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Join the club. I'm on number... four... i think..
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Old 10-12-2004, 02:26 PM   #5
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Ive bought 2 differant brands...just a bad design maybe?>
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Old 01-25-2005, 10:56 AM   #6
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Mine just started leaking out the back too. It'* about 2 years old, from Auto Zone, and was new (not rebuilt). The previous one (maybe the original?) had an internal problem that caused the pedal to go to the floor...
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Old 01-25-2005, 11:11 AM   #7
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that'* pretty nuts. do they all fail in the same way?
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Old 01-25-2005, 11:16 AM   #8
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Nope, this is the first time I've ever seen a master cylinder leak out the back, onto the vacuum booster. The leaking is the only symptom; on mine, the brakes work normally.

My experience has been that usually they fail internally and the symptom is that once in a while the pedal will go all the way to the floor and you'll have no brakes but then release the pedal and push it back down and it'll seem almost normal. I've had to replace several master cylinders on different cars for that reason.
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Old 02-20-2005, 02:36 PM   #9
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Default 4th master cylinder !

95 SLE with 124K miles... on the 4th master cylinder, and yes it'* RIDICULOUS.
So far two have done the pedal goes slowly to the floor at the traffic light routine, and the latest one leaks at the seal and drips down the vacuum booster.
The original lasted aboout 60K, and about 20-25K miles for the the rebuilts (all "lifetime guaranteed" from PepBoys).
Does anyone know if it'* really worth it to buy a brand new one, GM or otherwise?
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