[T3] Master Brake Cylinder

Dave Hall dave at hallvw.clara.co.uk
Wed Nov 15 18:10:02 PST 2017

First a warning:  Unless they have been used with silicone brake fluid, they
may be unserviceable anyway, due to internal rust or seal deterioration. 
Bus and Beetle M/Cs are quite different from Type 3.

Second, the holes for the brake light switches do not have the same bore as
the brake line holes (union size is the same but the fluid hole is
different). It makes sense to ensure the lines and switches are connected to
the right size fluid hole.  The VW manual B (Bremse = brake) warns of this.

UK VW Type 3&4 Club

-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of J. Jonik
Sent: 16 November 2017 01:45
To: type3 at vwtype3.org
Subject: [T3] Master Brake Cylinder

Re '71 Sqbk.  Master brake cylinder is obviously shot.  It's a wonder it
stops the car, but it does.   Unexpected benefit is that one DOES drive
Quite Carefully with minimal brakes.
  I have four or five spare master cylinders, all removed from past cars
when they were working.   BUT...there's differences...besides some being
more rusty than others.
Just one has an electrical plug connection at the end (facing front) of the
cylinder, not on the side.  It looks like the electrical plug has enough
room so it won't bump into the axle beam.  Was that from a bus, or beetle?
Some others have electrical plugs removed.  Others have plugs, but in
different plug holes than the others OR the one still in the car.
Bottom line question:  Does it matter which hole takes an electric plug...or
a brake fluid line?    Interchangeable? 
 That is, I'd rather have the three brake lines going to the same hole
arrangement as the one in the car, to minimize metal tube bending
contortions....then just put the electrical plugs in the remaining two
holes.   Is that the right path?   Bentley says nothing about this.
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