Mechanics

MASTER CYLINDER OR BOOSTER

1989 Buick Lesabre

Brakes problem
1989 Buick Lesabre 6 cyl Front Wheel Drive Automatic 175000 miles

My buick has an outrageous brake fluid leak. The problem is that the leak is coming from the casing around the brake booster. I have been told that doesn't hold fluid at all. Is it possible the fluid from the master cylinder is backing up into the booster and leaking from there?
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Mhschirling
March 25, 2009.



The booster doesn't hold any fluid. But there is a seal in the M/C close to where it attaches to the B/B. More than likely the seal is damaged and is leaking. For cost effectiveness, I would suggest replacing the entire master cylinder, rather than trying to fix the seal.

Tiny
Zackman
Mar 25, 2009.