1983 Volkswagen Gti Master Cylinder Leaking Fluid Into Booster Fitted New

1983 VOLKSWAGEN GTI
160,000 MILES
Avatar
DAVIDGTI
  • MEMBER
  • 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.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Oct 25, 2012 at 5:18 AM
Advertisement
Avatar
DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
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 25, 2012 at 5:21 AM
Avatar
EXOVCDS
  • ✓ASE Certified Mechanic
  • 1,883 POSTS
  • ASE Certified Mechanic
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 28, 2012 at 5:47 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.