 leaking master cylinder, need to replace master cylinder |
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| jrblackbox |
 Jun 6 2016, 01:58 PM
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#1
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Member  Group: Members Posts: 285 Joined: 8-September 15 From: Easton, CT Member No.: 19,140 Region Association: None 
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The master cylinder on my 1971 1.7 is leaking. I searched and haven't been able to find a DIY fix. From what I have read, the master cylinder can't be rebuilt any longer, I also read somewhere that a 911 master is an improvement over the 914. So, I am looking for the how to DIY and where should I purchase a new one? TIA
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| mepstein |
Aug 14 2017, 04:50 AM
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#2
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914-6 GT in waiting Group: Members Posts: 19,958 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Think of master cylinder size as a lever. Pretend you are removing lug nuts from your car. A short lever (large mc) requires more effort but less total travel. A long lever (small mc) requires less effort but needs more travel to move the same amount of fluid. Put a 23mm mc on stock brake calipers and the pedal will be rock hard but like removing lug nuts with a 6" handle (require tons of force). A 23mm mc might be a perfect size on a modern 911 with huge calipers so it's important to match the mc to the calipers on the car.
I've owned and driven stock 914's with both 17 & 19mm mc's. I prefer the smaller 17 for the lighter feel but I also like a light feel with more travel on all my road and mountain bikes. Many others like the firmer pedal feel of the 19mm mc but either will work fine and the 19mm is often less expensive. |
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Posts in this topic
jrblackbox leaking master cylinder Jun 6 2016, 01:58 PM
Tom_T No, the 911 19mm MC is sized for the 911/914-6 bra... Jun 6 2016, 02:13 PM era vulgaris The 19mm 911 master cylinder will give you a bette... Jun 6 2016, 05:07 PM McMark Yup, call PMB, Eric will set you on the right path... Jun 7 2016, 04:22 AM mankowski I'm about to replace my leaking 17mm master cy... Aug 13 2017, 07:01 PM Elliot Cannon Eric Shea is the guru of brakes. I have been usin... Aug 13 2017, 10:01 PM
McMark :agree: with Mark.
You can use either 17 or 19. ... Aug 14 2017, 06:33 AM |
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