Re: Atypical BOM Failure Mode?

[thyrsted2@olsy.dk (Kenn Thyrsted)]

Try pouring cold water over the MC when you've got the problem.
I'm currently chasing a similar problem; dissapears (almost instantly) when
cooling the MC with 1-2 litres of cold water.
Decided a rebuild of the MC.

/Kenn
----- Original Message -----
From: Fred Munro <munrof@isys.ca>
To: <mwoodland@program4.com>; <quattro@audifans.com>
Sent: Wednesday, July 21, 1999 4:38 AM
Subject: Re: Atypical BOM Failure Mode?


> Hi Mark;
>
>     Sounds like your master cylinder may be failing. A bomb failure
results
> in a hard pedal and the feeling that the rotors are greased!
>
>     You can test your bomb by running the engine to charge the system,
> shutting the engine off, and pumping the brake pedal until it gets hard.
You
> should get at least 10 applications. A new bomb will give 30+ before
running
> out of pressurized fluid.
>
> HTH
>
> Fred Munro
> '91 200q  277k km
>
> ----- Original Message -----
> From: woodland <mwoodland@program4.com>
> To: <quattro@audifans.com>
> Sent: Tuesday, July 20, 1999 9:07 PM
> Subject: Atypical BOM Failure Mode?
>
>
> > Greetings,
> > My '87 5KTQ has developed a new symptom..
> > Brake pressure/action/pedal feel are all normal at startup, but after 30
> > min. driving, pedal gets soft and braking is drastically diminished.
Feels
> > like the rotors are greased.
> > Multiple pumps give a brake warning light at this point, but not at
> > startup. If it were the BOM, I would expect a hard pedal in the morning,
> > with things returning to normal as the pump builds pressure.
> > Any help/BTDT type experience would be appreciated.
> > Best regards,
> > Mark Woodland
> >
>