[T3] 412 Brake Caliper Question

[Dave Hall]

I don't know the answer, but here's a theory for no mechanism:-
The Type 3 Haynes manual says the compensating system was needed because the
front axle design could produce disc flexing, pushing the piston back and
increasing the gap between piston and disc, leading to a delay in braking
while the extra gap was closed up.  The Type 4 had a quite different front
axle and suspension arrangement, as well as thicker discs that may well not
show the same problem, which meant no compensation system was needed.  I
don't know what the 914 front axle was like though.

Dave 
UK VW Type 3&4 Club
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-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Jim Adney
Sent: 04 March 2016 03:27
To: type3 at vwtype3.org
Subject: [T3] 412 Brake Caliper Question

Those of you who have studied Type 3 brake calipers know about the little
spring loaded compensating mechanism that lives inside each brake caliper
piston. That mechanism was OE for all VW Type 3 calipers.

Late ('71.8-'73) Type 3 calipers have larger pads and are the same as early
Type 4 and early 914/4 front calipers, and I believe those Type
4 and 914/4 calipers came with the same mechanisms.

Late (~'72.8-'74) Type 4s and 914s came with slightly larger calipers that
take thicker pads and have longer pistons, to give longer pad life. They
have the same mounting bolt pattern, but, no, they won't fit earlier Type 4s
or any Type 3s. (The spacing from the mounting plane to the rotor is
different.)

I recently got some of those late Type 4 calipers and found that they looked
to be completely original but they didn't have the internal compensating
mechanism. Nor did they have the pistons which could have accomodated that
mechanism.

Does anyone know if these late Type 4/914 calipers would have come
originally with that mechanism?

--
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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