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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 01-31-2013, 07:50 PM   #1
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HI all,

As with the title, I'm having trouble with my bonneville.

The brakes all of a sudden stopped working. At least the passenger side.

I pulled off both rear tires, and I can spin the drum on the driver side but not the passenger side.

I checked the passenger side brake cylinder and it'* not leaking. I can see it push forward and then it releases.

I tried checkign the front piston, but I don't have the right allen wrench.

Anybody knows what size it is? 8mm is too small and 10mm is too big.

Also the only place I see brake fluid is on the master cylinder where it connects to the reservoir.

Any idea what my problem might be? is the the master cylinder again? this would be the 3rd time I'm replacing it in 2 years. the last time, I went to Napa and got one of theirs.

Thanks

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Old 01-31-2013, 07:52 PM   #2
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Forgot to mention, yesterday when this first happened, I checked the fluid and it was empty. so I topped it off today.

Of course, it'* come down a little.
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Old 01-31-2013, 08:49 PM   #3
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its got to be going somewhere, sometimes it helps to have someone pump them while you look for fluid. you could put down clean cardboard and look for spots
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Old 01-31-2013, 08:52 PM   #4
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I think the front caliper is 3/8" allen.

Hope the master cylinder isn't leaking into the booster. Or is that not possible?
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