[T3] 69 Master Cylinder?

Jim Adney jadney at vwtype3.org
Mon Sep 27 10:47:12 PDT 2021

On 27 Sep 2021 at 8:57, Mike Fisher wrote:

> We put a new German ATE master cylinder on my '69 FI/AT square that fit.

It certainly fits, but the key is getting it plumbed up right and getting the 
brake light and brake warning light working correctly is not as straigthforward 
as many have assumed.

There are 2 different types of M10 x 1 tapped ports on these MCs: The three 
that feed the brakes at the wheels have ~1 mm restrictive drillings at the 
bottom, while the 2 for the brake light switches have ~3 mm holes, to make it 
easier to get more of the  air out of the switches. VW supplied a different 
hard line for the LF wheel when they introduced the late MC. That hard line 
feeds the LF wheel from the odd angled port that points down and to the 
right from the front of the MC. It may seem odd, but it's the correct way to do 

You can also reuse the early 2-pin brake light switches and eliminate the 
brake warning light. That light doesn't do much, so there's not much loss 
there, but I like to stick with VW's solution and enable the light.

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

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