 The Mystery 911 20.5mm Master Cylinder, I found where it came from |
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| 914Sixer |
 Jul 20 2017, 06:50 PM
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#1
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914 Guru  Group: Members Posts: 8,862 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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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. (IMG:style_emoticons/default/beerchug.gif)
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| rgalla9146 |
Jul 20 2017, 07:21 PM
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#2
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Advanced Member Group: Members Posts: 4,544 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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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. (IMG:style_emoticons/default/beerchug.gif) Hey Mark When I enter the part no. it switches over to 911 355 012 04 Is there a source ? I have a '69 S TIA Rory |
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| 914Sixer |
Jul 20 2017, 07:49 PM
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#3
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914 Guru Group: Members Posts: 8,862 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Rory,
I did not do any checking on the part. I was just excited about finding the answer. |
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| bdstone914 |
Jul 20 2017, 07:53 PM
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#4
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bdstone914 Group: Members Posts: 4,506 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
Porsche often switches part numbers of little used parts to ones that are functionally the same.
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