Me vs. Brakes: The Road to a Solid Pedal |
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Me vs. Brakes: The Road to a Solid Pedal |
Bwingate |
May 20 2024, 07:25 AM
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#1
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Newbie Group: Members Posts: 19 Joined: 30-March 24 From: New York Member No.: 28,029 Region Association: North East States |
I have been fighting mushy brakes since I got my 914. They are better but not great. I suspect there is a lot more bleeding to do, including finding the proportioning valve to bleed.
The PO said that they had the master cylinder changed by a local "Porsche expert" I suspect it was replaced with the 17 mm master cylinder. Can I confirm with an external inspection whether it is a 17 mm or 19 mm MC? So my plan is: 1) Bleed MC 2) Bleed proportioning valve 3) Possible replace soft lines 4) Bleed each wheel again. I saw something on this site that made sense, but I had never seen it before: Clamp off all the soft lines and test the pedal. If the pedal is solid, then the problem is at the wheels; if the pedal is soft, then it is the MC. Then unclamp each wheel one at a time - the "bad" wheel will be soft, the "good" wheels will have a firm pedal. Is this a bad idea? |
Bwingate |
May 20 2024, 10:27 AM
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#2
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Newbie Group: Members Posts: 19 Joined: 30-March 24 From: New York Member No.: 28,029 Region Association: North East States |
Thanks everyone -
I have a pressure bleeder, used it and like it. I am also a big fan of speed bleeders for one man bleeding. I used to do all the maintenance on my bikes (air and water cooled BMW's) and did most of the maintenance on my bug. I'd like to think I'm pretty good at bleeding brakes, but this car is fighting me hard. As I was concentrating on the rear brakes, I only bled them. I got some improvement but mostly I think that was from getting the vent distance closer. I did this a lot - 3 or 4 rounds, 2 quarts of fluid. I then did the front a couple of times and maybe a little more than a pint of fluid. I avoided the master cylinder just because it was hidden away and didn't feel like figuring out how to get to it. I'm going to have to attack the system component by component until I'm happy. The brake lines are old - don't know how old. I will have some lines on order from PMB, so they will be replaced soon, and then I'll have to do this all over again. |
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