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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?
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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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