1983 Volkswagen Gti Master Cylinder Leaking Fluid Into Booster Fitted New

1983 VOLKSWAGEN GTI
160,000 MILES
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DAVIDGTI
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  • 1 POST
Master cylinder was leaking fluid into booster. I fitted new master cylinder and drained the brake fluid from the booster. With the new master cylinder fitted the brakes lock on badly after a few applications. If I disconnect the vacum hose (I have block off the hose) the brakes release but I have no assistance. Is there any option other than replacing the booster.
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Oct 24, 2012 at 10:18 PM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Rebuilding the booster would be an option, it might be just as costly though. The brake fluid has damaged the booster and replacement is probably the only solution for this issue.
Oct 24, 2012 at 10:21 PM
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EXOVCDS
  • ✓Experienced Mechanic
  • 1,882 POSTS
Do you have the correct amount of free-play in the brake pedal?

If the pistons in the master cylinder are not able to return fully, pressure will build-up in the lines because fluid can not return into the reservoir.

Adjust the booster rod "tip" that pushes against the master cylinder to get the correct amount of free play.

Thomas
Oct 27, 2012 at 10:47 PM
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