Re: unbalanced urquattro braking

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <9809041559.AA41368@fluhr.austin.ibm.com> ejfluhr@austin.ibm.com (Fluhr) writes:

> The front brakes calipers are stock, the rear brake calipers are from
> a 1986 4000 quattro.  I know that the brake proportioning valve is
> the original, and it shows no signs of leaking brake fluid.  I believe
> that the brake M/C is original, as well.  Brake pedal pressure and
> response is good, no softness or excessive travel when braking.

As long as the rear piston diameter is the same as stock, it shouldn't
matter.

I would suggest flushing the rear brake lines twice - left, right, left,
right.  This seems to push something around in the proportioning valve.

> Is this likely to be a bad brake proportioning valve (I have no
> experience with the quattro-style valve, is it adjustable)?

It's _not_ adjustable.

> Potentially a bad brake M/C?

No.  Either a dead proportioning valve, or too small a piston diameter
or sewpt area in the 4000q calipers.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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