proportional valve: how important to have working one?

[Kneale Brownson]

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I believe the rear brake proportioning valve is on all the Type 44
cars.  It's in the line from the ABS box.  It's where the line divides to
go to each rear wheel (in other words, there's one brake line from the
front of the car to the valve and two from the valve, one to each rear
wheel).  It is mounted in front of the driver side rear wheel and attached
to the suspension with a spring-loaded lever that reacts to the suspension
being compressed, I believe.  It's item #6 in this
image:  http://catalog.exist.ru/pic/parts/VAG07210.gif


At 03:51 PM 02/26/2002 -0800, Brian Devlin wrote:

>I didn't know that quattros got the active proportioning valve
>thingies. Wouldn't the 89's have ABS anyway? So wouldn't we be taking
>about the proportioning valve situated under the master cylinder? The
>one you're not supposed to be adjusting anyway? Or am I just confused?
>
>And what functional test/drivability issue are we really talking about?
>
>-Brian
>-86 5ktq
>
>>--
>>Proportioning valve is supposed to adjust rear braking for load, I
>>believe.  Don't know what that adjustment would be, though.  If your rotors
>>are remaining rust-free, your rear brakes are working, probably at least
>>for minimum loading of the car.
>>
>>
>>At 05:31 PM 02/26/2002 -0500, Konstantin Bogach wrote:
>>
>>>Hi listers.
>>>
>>>Proportional valves on both my cars do not work.  They are frozen.  How
>>>significantly it affects braking?  Can it freeze in such position that
>>>reduce overall braking power?
>>>
>>>Thank you.
>>>
>>>Konstantin Bogach
>>>200tq '89
>>>200tqa '89
>>--
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>
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