Re: Changing the brake fluid on my '90 100

[glen.powell@smc.com]

  I've found it to be all but impossible to bleed Audi brakes with
  the "pedal pump" method if any air is allowed to enter the system.
  Also, the observed level in the resivoir does not need to go as
  low as you would think, looking at it, for air to get in. Bently gives
  a somewhat "different" order for bleeding Vs most make's
  manuals, and it is important to bleed the pressure regulator
  first. Bentley also suggests "power bleeding". I've had some
  success with the "MightyVac" unit, but I always have the same
  *$&%'n problem already mentioned with air leaking in through
  the bleeder screw threads. I've tried grease, etc. to try to seal
  the threads with little success. Eventually I can get the job done
  but not without some frustration and much wasted brake fluid.
  I have yet to discover the secret to fix this problem, but I am
  convinced that the power bleeder is the way to go. I have
  had no such problems with pedal-pump bleeding with
  'Mercan iron.

  -glen