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Proprtioning valve & ABS

In message <v04003901b0f7cb33607a@[]> Brett Dikeman writes:

> I was not aware that any ABS system on the market used accelerometers,
> especially since in '90-92 they were very expensive, unreliable, and
> innaccurate.  I might expect them in traction control systems nowadays...

Well, it's _called_ an accelerometer.  It's actually a mercury switch.
They were first fitted to the Sport quattro (in transverse orientation) and 
they showed up in the ur-quattro/200/5000 in 1988/9.  It's a small black 
object mounted under the rear seat, with a prominent arrow pointing in the 
(usual) direction of travel.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club