Brake master cylinder

[Jay Kempf]

Depends on what your tolerance is for cheap chinese rebuilds. Anywhere from
$100-150 for rebuilds and $300-$500 for supposed new original parts.
 
Seals are basically free and the only thing that ever goes bad. I rebuild
stuff all the time that supposedly you can't rebuild. I trust my own work
more than rebuilders. I rebuilt every hydrualic unit and all of the CIS fuel
injection stuff in my 928. The fuel distributor was selling for something
like $1100 new. I rebuilt it for a handful of free orings from an autoparts
store near where I live. Took an hour of measuring.
 



jfk


-------------------------
Jay Kempf
jkempf at madriver.com
802 272 5868 

 

  _____  

From: PeterBergin at aol.com [mailto:PeterBergin at aol.com] 
Sent: Thursday, December 01, 2011 9:09 AM
To: jkempf at madriver.com; auditony at gmail.com
Cc: b.benz at charter.net; 200q20v at audifans.com
Subject: Re: Brake master cylinder


Hate to ask, but how much is a new one.  I bought one from a local auto
parts store 12 years ago for an old 5000 avant that preceded my 200 which
preceded my S6.
 
I was only $75
 
Pete
 
In a message dated 12/1/2011 8:05:44 A.M. Central Standard Time,
jkempf at madriver.com writes:


That has not been my experience with 20 year old seals. They turn to hard
plastic and stop working like a seal eventually. There are a few Dorman part
numbers for kits for different bore diameters for VWs of the same vintage. I
just need a MC off the car. For me sourcing seals is not a problem. I have
been in the trenches in engineering for decades so I know how to measure and
find the right seal even if I don't have a part number. So back to anyone
got a dead one they would like to donate to the experiment? Boils down to
two lip seals normally in Nitrile Rubber for DOT 3/4. 
 



jfk


-------------------------
Jay Kempf
jkempf at madriver.com
802 272 5868 

 

  _____  

From: Tony Hoffman [mailto:auditony at gmail.com] 
Sent: Thursday, December 01, 2011 8:25 AM
To: jkempf at madriver.com
Cc: PeterBergin at aol.com; b.benz at charter.net; 200q20v at audifans.com
Subject: Re: Brake master cylinder


Jay,
 
I'm one that agrees with Bernie on this. Take it apart and clean everything,
inspect closely. If the rubber is not torn, no reason to replace it. It will
seal well, not intermittently. If you can get a rebuild kit, by all means
replace everything if you wish. However, they are not available for any of
these older Audi's that I'm aware of, and therefore a real PITA to source
each little piece. So, I jsut dissassemble, clean out all the gunk (which is
what is giving you problems IME) and reassemble. 
 
Tony


 
 
Jay, DFWAB!
Your MC is probably OK if the pedal does not go to the floor, however
slowly.
And one does not need rebuild kits for MC or calipers unless a boot is torn
and needs replacement.
Just clean the parts well and reassemble.