brake booster check valve

[Orin Eman]

> > 
> > >  <<<
> > >  >There is a check valve in the brake booster to prevent pressure from entering 
> > >  the booster on many cars.  Under boost >you loose all effects of   >>>
> > >  
> > >  On the plus side these valves are just inexpensive plastic valves available 

> Supposedly, the new Mustangs have a system called "hydroboost" that
> takes the power-brake boost from the power-steering pump instead of
> engine vacuum.  I've not investigated it, but saw mention of it in
> a Mustang magazine.

Ha ha ha!  What a lovely can of worms they've opened there.  This is one
of the less reliable features of the Audi 5000/200... wonder if they have
a hydraulic accumulator to go bad and leaky power steering pumps due
to the high pressure required too!

Orin.