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Posted by: 914Sixer Jul 20 2017, 06:50 PM

About 2 years ago, I started working on the 75 Orange car. I knew I had a larger than stock master cylinder because of the high pedal pressure. It had the number 20 on it instead of 19. I posted on the the forum and no one had ever seen one. Speculation was it was from a BMW or perhaps a Mercedes. Well, today I was reading UP-fixin der Porsche Vol IV and came across an article about 1969 911 brakes. The article stated that there was a 20.5mm master cylinder. It was only used for the one year or less when it was replaced by the 19.5mm. The part number for it is 901.355.012.04 or ATE 3.2120-3901.3. I love it when I can solve a mystery.

Posted by: rgalla9146 Jul 20 2017, 07:21 PM

QUOTE(914Sixer @ Jul 20 2017, 08:50 PM)

About 2 years ago, I started working on the 75 Orange car. I knew I had a larger than stock master cylinder because of the high pedal pressure. It had the number 20 on it instead of 19. I posted on the the forum and no one had ever seen one. Speculation was it was from a BMW or perhaps a Mercedes. Well, today I was reading UP-fixin der Porsche Vol IV and came across an article about 1969 911 brakes. The article stated that there was a 20.5mm master cylinder. It was only used for the one year or less when it was replaced by the 19.5mm. The part number for it is 901.355.012.04 or ATE 3.2120-3901.3. I love it when I can solve a mystery.

Posted by: 914Sixer Jul 20 2017, 07:49 PM

Rory,
I did not do any checking on the part. I was just excited about finding the answer.

Posted by: bdstone914 Jul 20 2017, 07:53 PM

Porsche often switches part numbers of little used parts to ones that are functionally the same.