Re: What is it about the bomb?

[jgraham1@erols.com]

Steven Buchholz wrote:

> > > If it is the seals, can they be replaced?
> >
> > No, when it's dead it's dead.
> >
> > > I had my bomb tested two years ago for a small leak (which it had)
> and
> > > it
> > > has not failed. It still takes between 10 - 20 seconds for the
> brake
> > > light
> > > to go out when starting. I have never had a loss in pressure.
> > >
> > When the light go's out when the engine starts get out the bucks for
> a
> > new one.
> >
> Actually Steve Powers found out that for his S6 the brake light would
> stay
> on for a few seconds, maybe as many as 10.  The dealer tried to fix
> it,
> but the word back from Audi was that it was operating properly.  This
> may
> be BS, I'm just forwarding what I heard.

Audi was right. The light  gos out at 1261 - 1841 psi . The system
operates above 2030 psi.

> It turns out that Bentleys and Citroens use a similar hydraulic
> system.
> There is a guy at work that is a big CX(?) fan, and he tells me that
> they
> have pressure accumulators that can be recharged or rebuilt.  I don't
> know if it is possible to retrofit one of these units to an Audi.  The
>
> other thing to keep in mind is that there are different kinds of
> "bombs."
> The one on my '83 urQ screws into the valve body and is very easy to
> re-
> place.  The one on the '88 5kCSQ appears to be a little more
> integrated
> with the valve body.  The 80/90Q may be different than both ...

CX brakes had a 1/4" travel on the brake pedal. Now that power brakes.

> If you have any issues with a system as crucial as the braking system
> you really should seek out professional assistance.
>
> Steve
> Steven.Buchholz@kla-tencor.com
> San Jose, CA (USA)

  John
1990 QC