[Vwdiesel] Brakes 91 Jetta pedal to floor

[LBaird119 at aol.com]

  When you pump the pedal the booster WILL drop out in a couple 
pumps generally because you're using up all the vacuum while pumping 
up the hydraulic system. 
  3 main possibilities for a sinking pedal:  
Bad master cylinder letting fluid past the seals.  
Bad master cylinder leaking fluid into the booster.
Worn rear brake shoes and/or drums letting the pedal 
  drop beyond what it should due to the self adjuster 
  being all the way out already.

  I had similar problems with my Jetta and replaced the MC. 
It turned out to be the rear drums, which I thought I'd already 
done.
     Loren


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