Re: UrQ brake bleeding

["Fred Munro" <munrof@isys.ca>]

Andrew;

    I just flushed the brake system on my '91 200q yesterday. I also tried
using a vacuum pump on the rear calipers with little success. I could
generate lots of vacuum ( moisture in the old fluid was vaporizing in the
cup at one point), but got little flow - I think the proportioning valve may
block the flow of fluid. I finally went back to the old tried & true pump
the brake pedal approach. This works OK for flushing because there is no air
in the system but sometimes takes a long time to clear air. A pressure
bleeder is usually the best bet for bleeding.

HTH

Fred Munro
'91 200q  262k km
-----Original Message-----
From: ANDREW FINNEY <afinney@bigplanet.com>
To: quattro@coimbra.ans.net <quattro@coimbra.ans.net>
Date: Monday, November 16, 1998 9:00 AM
Subject: UrQ brake bleeding


>Help. Yesterday I tried to bleed the UrQ brakes after replacing the
>front calipers. Here's what happened. I bled the pressure distributor,
>fine. Then I bled the master cylinder. Nothing but air. Hhmmm. So I
>decided to check the front calipers. Those bled fine. Back the
>distributor, fine. Back to the MC, nothing but air. The rears were
>giving nothing but air as well. Then I leveled the car and filled the
>reservoir right to the top. Finally I could bleed the MC. Then I bled
>the distributor. Then the right rear, nothing but air. For one hour I
>got nothing but air. I was using a vacuum bleeder which has worked OK in
>the part. It works well on the fronts and all the other places but I
>can't get fluid from the rear. I used a lot of teflon tape on the
>bleeder screws which seemed to help the air leaking past the screws.
>
>The brakes work, they just require a little more effort and have a
>little more pedal travel than they used to. This is the symptom of air
>in the lines, as I remember from the past UrQ bleedings? Anyone have any
>thoughts? Phil gets a special mention as yesterday he called me from
>England to tell me to hold the brake pedal down when bleeding. Thanks a
>lot Phil, I appreciated that help. Can someone tell me how to make a
>pressure bleeder cap that I can use a bicycle pump to pressurize the
>reservoir? HELP.
>
>Andrew Finney
>1983 UrQ.
>