[urq] Brake Booster Rebuild Kit

[Bill Bennett]

Justin, my son has been running an MC conversion on his '86 4000 CSQ for a year with no vacuum assist pump to the brake booster other than available manifold vacuum and no brake complaints, and he is 1. a very aggressive and capable driver and 2. very quick to point out problems. 3. brakes ain't one of them 4. yeah the windshield leaks water 5. yeah the door seal noise with body flex went away when lubed with "rubber care" from Wurth. Bill 
  ----- Original Message ----- 
  From: Justin 
  To: urq at audifans.com 
  Sent: Monday, February 23, 2004 8:34 PM
  Subject: Re: [urq] Brake Booster Rebuild Kit


  All this talk about brake boosters has motivated me to give some
  input/questions.  I'm currently doing a turbo conversion on my 4kq with an
  WR engine.  Since I know of many who have done this without an external
  vacuum pump, I have assumed that turbo engines produce enough manifold
  vacuum to supply the brake booster.  Does anyone know this to be true?
  Also, I've have thought of using a Idle stablizer valve to work in
  (parallel) and in place of a cam driven vacuum pump..(like on the 4kq's)..
  Has anyone else tried this, or is this even necessary on high vacuum turbo
  engines?
  Justin
  ----- Original Message -----
  From: "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>
  To: <urq at audifans.com>
  Sent: Monday, February 23, 2004 6:17 PM
  Subject: RE: [urq] Brake Booster Rebuild Kit


  > ... while it is not likely I would end up doing the mod myself, I can see
  > the motivation to do so on the cars that were imported to the USA.  Parts
  > are getting more and more difficult to come by and considerably more
  > expensive too!
  >
  > In effect what you would be doing is simplifying the hydraulic system so
  > that it becomes a simple power steering setup ... like the GT Coupe, with
  > the vacuum boosted brakes like the Coupe too.  The reason Audi installed
  the
  > hydraulic brake assist is because you can't always count on a supply of
  > vacuum on a boosted engine, but you can solve that problem with an
  auxiliary
  > vacuum pump (as other marques did to for turbocharged engines).  Think
  about
  > it ... no more valve body ... no more bomb and no more pressure switches
  to
  > leak ...
  >
  > As I write this post I am starting to wonder if I shouldn't go ahead and
  do
  > this too ... I know my brake booster is seeping into the passenger
  > compartment ... anyone have any recommendations for vacuum pumps?
  >
  > Steve B
  > San Jose, Kaleefohnia (USA)
  > >
  > > ...  I've considered doing the same but would shy away from it in
  > > the case of anything short of an engine replacement.
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