[T3] Type 3 front break calipers

Daniel K. Du Vall dduvall at 1peter4-10.org
Tue Mar 21 03:54:58 PDT 2017

Sorry to bother you but these seem to have the two bleeders what do you think?


-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: Monday, March 20, 2017 10:36 PM
To: type3 at vwtype3.org
Subject: Re: [T3] Type 3 front break calipers

When replying, please consider trimming your message. Thanks! :)

On 21 Mar 2017 at 2:03, Daniel K. Du Vall wrote:

> Sorry should have been more clear about the bump. I was referring to a 
> casting bump that will be found on aftermarket replacements on the 
> side that faces the rim. I have a set of original Bug clippers that 
> have no casting bump and a set of new ones that do. The set I have 
> that are in question do have duel blead valves as well as a tube that 
> connects each side of the caliper.

I'm not sure, but I suspect that external casting features can vary a lot, even with OE calipers. For example, You can find at least 3 different kinds of bolts that hold the caliper halves together. I think they just represent different eras of production, some of which may even be Brazilian. There WERE good Type 3 calipers made by ATe in Brazil, but no longer. Only Type 1s are made today.

As far as a tube that connects the 2 sides of the caliper, that doesn't sound remotely OE. I've never seen anything like that.

> Now that you mention it I think the ones on the 72 only have a single 
> blead valve will verify that in the morning. If it's true I probably 
> have the wrong ones on there to begin with yikes. I will take pictures 
> of the ones I have and post them.

All the late OE Type 3 calipers have dual bleed valves. All the early OE ones have single bleed valves. You can find other variations made for other cars. 
Current Type 1 calipers have dual bleed valves and lack the internal compensating mechanism. That means they can be either L or R, but they have
40 mm pistons, yielding 10% less braking force for the same pedal pressure, thus also changing the F to R braking balance.

If you have a caliper that's right except that it needs another bleed valve, I can add it, but that costs $$$.

Ate made lots of calipers for lots of different cars. They often did this starting from the same castings, so you can't always tell what you have until you measure the pistons. I've seen calipers that look like ours that have 37, 38, 40 and 42 mm pistons.

There's also the late Type 4/914 calipers that look like our late calipers, but they have a wider pad pocket and they won't work on our late cars because the rotor hits the casting. They're easy to confuse unless you have the other style at hand for compartison. You can shim them, but IMHO that's a very iffy thing to do.

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

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