[T3] Late Type 3 Calipers

[Dave Hall]

I think these calipers may need a bit more investigation, Jim. 
At least with only one bleed valve, there's no doubt which side they need to
be fitted, however the piston orientation may not be corrct for a Type 3.
  
Genuine calipers need the piston retaining clips and piston orientation set
correctly for a Type 3.  If not, the pads can wear unevenly.  The Type 4
calipers fit in front of the hub, while Type 3 fit behind, which needs
checking before installation, and may require the pistons turning
appropriately.
  
I've not seen any late calipers with single bleed valves.
I think the Type 3 had the disc runout ccmpensating pins in the cylinders.
Do these have them, or perhaps it was only the ones through '71 with the
thinner discs?

I've forwarded Jim separately a page from our Club Technical manual with the
Type 3 piston orientation, and some comments from a member. 

Dave
UK VW Type 3&4 Club
===================

-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Jim Adney
Sent: 18 June 2017 18:42
To: type3 at vwtype3.org
Subject: [T3] Late Type 3 Calipers

As most of you know, late Type 3 calipers are the same as early Type 4 and
early 914/4 calipers. To the best of my knowledge, all those cars came with
calipers that had 2 bleed valves. About a year ago, someone sent me one of
those calipers that had only a single bleed valve. I thought this was odd,
but it had VW cast into the caliper housing, so I accepted it as some kind
of mistake.

I worked out a way to drill and tap for the second bleed valve so that it
could be "correct." 

Recently I got another one of those "rogue" late calipers, again with a
single bleed valve and with VW cast into the housing. I'm really wondering
where these came from. Does anyone know?

My only thought is that at some late date, VW may have decided not to pay
for the extra bleed valve for spare calipers to be sold as replacements. Is
it possible that at some point VW started stocking replacements with only a
single bleed valve? Does anyone know?  

I've worked out a way to drill and tap these to make them just like the
originals, but it's a lot of extra work. Still, I think it's worth it since
these parts are so hard to find in good condition otherwise.  

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