[T3] ATe Brake Caliper Question

[Jim Adney]

I'm hoping someone on this list can help me with a couple of caliper 
questions. I rebuild a lot of Ate (Alfred Teves) calipers for our 
Type 3s. They come in 2 versions: smaller early ('66-71) and larger 
late ('71-73.) These have cast steel bodies with 2 opposed 42 mm 
pistons in 2 cylinders. They are fixed, not floating, calipers. These 
both have the extra pins in the caliper body and the mechanism inside 
the piston to compensate for excess axle flex. There is also a later 
Type 4/914 caliper that is almost exactly the same as the late Type 3 
caliper except that it takes a thicker pad. This caliper does NOT 
have the compensating mechanism and will not fit any of our Type 3s. 
Once I've seen a few calipers from this era, it's clear that Ate 
machined calipers for different applications from the same castings, 
so, for example, Beetle calipers look just like ours, but have 40 mm 
bores rather than 42 mm bores. There appear to be lots of variations 
made from the same castings.

I've read references to different versions or generations of Ate 
calipers and, just out of curiosity, I'd like to know which versions 
I'm working on. I've seen references to an "M" caliper. Were all the 
Ate caliper generations assigned an alphabetical letter in order? 
Does anyone know what ours are?

Also, over the years I've accumulated a couple of calipers that 
appear to have come from different cars. If possible, I'd like to get 
those back to someone who might really want them. Here's what I have:

1) Smaller caliper, the same casting as Type 3 early ones, 42 mm 
plain pistons, with cast in BMW and Ate markings. Would these be for 
2002 or 1600, perhaps rears? This one could be built up to fit a Type 
3, but without the compensating mechanism.

2) Smaller caliper, the same casting as Type 3 early ones, 38 mm 
pistons with the special compensating mechanism inside but without 
the usual 20 deg cut on the piston face, with cast in Ate marking 
only.

Can anyone tell me what these might have come from? Is there a 
listing somewhere that calls out all the Ate caliper variations with 
their applications? I'd love to see a chart with all this info on it. 

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