[urq] Brake pressure regulator

Tue Jul 15 15:14:35 PDT 2008

I did the 5000 G60 upgrade and master cylinder upgrade (bigger 23,8 mm P/N 
443 611 021 also from 5000) but kept/replaced the stock pressure regulator 
(P/N 803 612 303), and I never locked the rears during emergency stops 
because of a wrong bias. FWIW.

Regards,
Maurits

1986 quattro GV

----- Original Message ----- 
From: "milisen " <milisen at hotmail.com>
To: ""urq" " <urq at audifans.com>
Sent: Tuesday, July 15, 2008 10:33 PM
Subject: Re: [urq] Brake pressure regulator

>
>
> -----Original Message-----
> From: milisen  <milisen at hotmail.com>
> Sent: 7/15/2008 4:35:01 PM
> To: wbremer  <wbremer at maine.rr.com>
> Subject: RE: [urq] Brake pressure regulator
>
>
> Hi & thanks for the answer,
>
> if its not too much bother I'd be glad if you could check the product 
> number!
>
> I'm actually very interested in this option despite I'm trying to keep the 
> urq original. Has anyone here with an adjustable valve experimented how 
> the handling changes when you apply more brake power to the back? I 
> suppose left foot braking works really nicely with more power to the back! 
> Talking of...has anyone
> dared to try left foot braking with the urq?
>
> Approximately how much did the valve cost?
>
> Cheers,
> Johan H
> Helsinki, Finland
>
> -----Original Message-----
> From: wbremer <wbremer at maine.rr.com>
> Sent: 7/15/2008 1:24:06 AM
> To: 'milisen ' <milisen at hotmail.com>
> Subject: RE: [urq] Brake pressure regulator
>
>
> Johan:
> There are manual, adjustable brake bias valves that are often used in the
> earlier urqs when someone converts the front brakes from the single-piston
> calipers to the double-piston G60 calipers.  When this conversion is done,
> the factory front/rear brake bias valve (the one that is leaking on your
> car) is somewhat dangerous in that the rear brakes can lock up in a panic
> stop.  A company called Tilton makes them here in the States.  If you want
> to investigate that approach, I'll find the model number of the one that I
> put on my Euro '82 urq.  It has a handle and five different front/rear 
> bias
> positions.  It is an easy install (maybe you need to get one extra short
> brake line made) and it has worked on my car without problems since 1996.
> Bill
>
> -----Original Message-----
> From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
> Of milisen
> Sent: Monday, July 14, 2008 12:37 PM
> To: urq at audifans.com
> Subject: [urq] Brake pressure regulator
>
> Hi q-friends,
>
> sorry I haven't been that active on the list lately. But now to my 
> question.
>
> after a spirited drive with my -88 MB on the countryside, I noticed that 
> the
> brake fluid level was low. I traced the problem to the brake pressure
> regulator (not sure thats the right name, but it is the device that sits
> below the brake master cylinder, which divides the pressure between the
> front and the back in case of a falure)
>
> well back to the problem. The pressure regulator seems to be leaking. Has
> anybody repaired this, or do I have to search for a new one? I suppose its
> NLA
>
> cheers,
>
> Johan H
> Helsinki, Finland
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