1989 Buick Lesabre Master cylinder or booster

Tiny
MHSCHIRLING
  • MEMBER
  • 1989 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 175,000 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?
Wednesday, March 25th, 2009 AT 4:19 PM

1 Reply

Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
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.
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Wednesday, March 25th, 2009 AT 10:35 PM

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