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Re: '86/87 5KCSQT MC to Hydraulic assist seal?



There is a rubber seal between the master cylinder and the booster, Ben,
but I don't think it seals against hydraulic oil leaks.  I think the
booster is sealed internally, and a leak at the junction between it and the
MC is one of the symptoms the booster is shot.  I also don't believe
there's any kind of rebuild possible.

Kneale Brownson


At 10:15 AM 9/30/99 -0400, Swann, Benjamin R.  (BSWANN) wrote:
>
>Is there an O-ring or other type of seal that can easily be replaced between
>what is apparently a hydraulic Boost cylinder which the Brake Master
>cylinder is mounted on?  
>
>I discovered what apears to be a slow leak of Pentosin coming from where the
>two mate together.  I noticed a line coming from the power steering
>reserviour to a fitting connected to a cylinder that the Brake Master
>Cylinder is mounted to.  Interesting engineering here!  Must be the AUDI
>turbo answer to Vacuem assist - Correct? 
>
>Is this an easy fix, or is  there possibly something more severe wrong?  Any
>BTDT on this.  I hope this will not require compete replacement of rebuild
>of this hydraulic cylinder (pre-master/boost cylinder) - whatever it is
>called.
>
>I'm losing about a drip every 2 minutes, or enough to draw the Pentosin
>level down to min mark in about 2 days (causing the Brake warning light to
>come on).  Bet others could trace some of their liquid gold leakage to this
>rather than the steering rack.  Otherwise, Brake, steering systems work OK.
>
>Ben Swann
>'85 4KSQ
>'86 5KCSQT
>'87 5KCSQT Wagon