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Re: type 44 brake question - long answer
At 08:30 PM 10/13/98 GMT, Phil Payne wrote:
>In message <email@example.com> "Frank J.
>> >Roger's car is the only one I'm really familiar with, and his
>> >proportioning valve is under the master cylinder in the engine bay.
>> the device being referred to is a valve that is actuated by a lever
>> connected to the lower rear control arm that reduces braking pressure when
>> the rear lifts (unweights) under braking.
>> not likely to be located in the engine room...
>Non-quattros have a rear torsion bar suspension, to which the device
>you mention is attached.
>Quattros have full rear Macpherson/wishbone suspension. What do you
>attach your device to?
on the type 44 quattro, the bpr is attached to the rear subframe.
the actuating lever on the brake pressure regulator is attached to a lever
on the trapezoidal (lower control) arm with a stiff spring.
>The engine bay device contains a large mass ...
perhaps you are thinking of the abs unit.
i cannot picture any device resident in an audi engine bay that is capable
of judging the attitude of the rear suspension...
ps - perhaps a later evolution of abs controlled the rear bias with the
help of an accelerometer...