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Bwingate |
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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? |
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steuspeed |
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#2
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,008 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest ![]() |
I had a lot of trouble getting a hard pedal after I replaced my MC 17mm. I have bled many different cars and never had a problem. I did not bench bleed the MC. After many old school pedal pump bleeds, I final borrowed a pressure bleeder. It got better, but still from memory, not as good as before. Maybe it's the Porterfield RS4 pads I installed at the time? Maybe they don't have the initial bite when cold?
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Superhawk996 |
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#3
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,016 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch ![]() ![]() |
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