Pierburg Pump, Brakes, etc., etc.

[Joshua van Tol]

Just a single locked brake is probably a bad flexible line, or  
possibly a bad caliper.


On May 8, 2006, at 9:14 PM, John S. Lagnese wrote:

> Does this mean all brakes lock up or could just one, such as my RF  
> brake.
> John
> ----- Original Message -----
> From: "Ben Swann" <benswann at comcast.net>
> To: "'Alex Kowalski'" <hypereutectic1 at gmail.com>
> Cc: <quattro at audifans.com>; <benswann at comcast.net>
> Sent: Sunday, May 07, 2006 11:05 PM
> Subject: Pierburg Pump, Brakes, etc., etc.
>
>
>> Alex,
>>
>>
>>
>> You'll have no problem with the Pierburg pump.  As good as the  
>> Bosch OEM
>> one.
>>
>>
>>
>> Yes - that is the master cylinder causing the problem you describe.
>> Don't
>> procrastinate, replace it and be done with it.  Purge all that old  
>> fluid
>> out
>> of the system.
>>
>>
>>
>> Ben
>>
>> benswann at comcast.net
>>
>> 83 urq, /[][] =oooo= [][]\ alpine and Inga
>>
>> '90 Coupe Quattro (==\ oooo /==) ES2 Conversion
>>
>> 91 200qa20v, [ =!\=oooo=/!= ] avant and sedan
>>
>> [Date: Sat, 6 May 2006 16:28:06 -0400
>>
>> From: "Alex Kowalski" <hypereutectic1 at gmail.com>
>>
>> Subject: Pierburg Pump, Brakes, etc., etc.
>>
>> To: quattro at audifans.com
>>
>> Message-ID:
>>
>>      <1030738a0605061328s1ed36e1fvb76918d866dd7513 at mail.gmail.com>
>>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>>
>>
>> Hi everyone,
>>
>>
>>
>> Since I'm the disreputable character who got everyone started on the
>> Pierburg pump craze (apparently) I can only say that I haven't had  
>> the
>> chance yet to install mine in the '87 5KCSTQ because of other  
>> issues.  As
>> soon as I get it in there with a new filter I will let everyone know
>> exactly
>> how it works.
>>
>>
>>
>> Since the weather has warmed up here, and I did my rear suspension  
>> and
>> brake
>> calipers, and replaced my old, decrepit bomb with Dave Kase's  
>> wonderful
>> remanufactured one (highly recommended -- installation was as much  
>> of a
>> snap
>> as you get with these cars) I have also discovered to my endless
>> consternation that I also have the infamous "brakes dragging when
>> everything
>> is hot" syndrome.
>>
>>
>>
>> I've taken the car out for several spirited rides since doing the  
>> work on
>> the rear end and the bomb, and one of the results was to get  
>> everything on
>> the car nice and toasty.  And with the warmer weather, this means  
>> that the
>> radiator cooling fan was doing its normal job, pumping hot, hot  
>> heat right
>> at the brake master cylinder.  Which in the warmer weather is now  
>> causing
>> the brakes to drag.  There are several posts in the archives about  
>> this.
>>
>>
>>
>> I tested it in a similar manner, and with another (wierder)  
>> method:  first
>> I
>> loosened the lines and got the fluid flow and the brake release to
>> demonstrate to myself that yes, in fact, the brake system was being
>> pressurized when it was hot.  Then I got a couple of those gel-pac  
>> cold
>> compresses, got everything hot again, waited for the brakes to  
>> stick, and
>> then wrapped the MC in freezing cold gel.  Voila!  After a few  
>> minutes the
>> brakes came loose (with the engine still running!) so I am 99  
>> 44/100% sure
>> the master cylinder is shot, too.  Not letting hot fluid back into  
>> the
>> reservoir, perhaps.  In any case, it beats the price of replacing the
>> servo.
>>
>>
>>
>> I should have known.  The Audi Gods always get their tithe.
>>
>>
>>
>> I'll do the M/C along with the Pierburg and give everyone a full  
>> report.
>>
>>
>>
>> Cheers,
>>
>> Alex Kowalski
>>
>> '87 5KCSTQ -- Mostly done
>>
>> '86 5KCSTQ -- Supposedly the "project" car.  ROTFL.]
>>
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