[urq] Locking brakes

[John Koenig]

I'm not any help on the assumed master cylinder issue(s), but...

No one has mentioned this, so I'll just throw it out...  I have had
experience with brake hoses that will collapse internally when removing
hydraulic pressure (releasing the brakes), interfering with the release of
pressure from the piston(s) and causing the brakes to 'stick.'  I understand
that heat appears to be an issue with the problem being discussed, and what
I'm suggesting is probably unrelated, but I just thought I'd offer it up in
the spirit of food for thought...

~John



-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com]On
Behalf Of Patrick Carlier
Sent: Monday, March 04, 2013 12:52 PM
To: fdekat; urq at audifans.com
Subject: Re: [urq] Locking brakes


Yes  a known problem , but
what's causing it ?

There's no sign of wear or damage or anything out of the ordinary
to a "faulty"  master cilinder .

Pat



----- Original Message -----
From: "fdekat" <fdekat at sentex.net>
To: <urq at audifans.com>
Sent: Monday, March 04, 2013 10:57 AM
Subject: [urq] Locking brakes


>> Message: 1
>> Date: Sat, 2 Mar 2013 07:26:37 +1000
>> From: "Doug Rath" <drath1 at optushome.com.au>
>> To: <urq at audifans.com>
>> Subject: [urq] Locking brakes
>> Message-ID: <C018DE0524874F9181A18242F35F706D at DougPC>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi guys,
>> I have had a persistant problem with the brakes on my WR not releasing
>> after a number of aplications.
>> Master ok
>> Brake hoses ok
>> My mechanic tells me that there is a wear spot on the piston from the
>> booster which is causing the problem.
>> We are making a spacer to fit between the master and the booster so as
>> the
>> piston will operate on a diferent area of the piston.
>> Has anyone experienced this problem.
>> Cheers.
>
> Many have had problems with brakes not releasing/applying themselves *when
> master cylinder gets hot*.
>
> Usually happens in 'stop and go' driving, as underhood temps go way up.
> If you think that may be a possibilty, a very quick test is to spray down
> the
> master cylinder with a small had sprayer to cool it down.
>
> Is sort of a 'known problem' in the 5000/200/urq world.
>
> (Repair solution is replacemnt of master cylinder.)
>
> =Frank=
>
>
> _______________________________________________
> Audifans urq mailing list
> Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
> http://www.audifans.com/kb/List_information
>
> Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/
>

_______________________________________________
Audifans urq mailing list
Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
http://www.audifans.com/kb/List_information

Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/