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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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bkrantz |
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#2
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 7,842 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains ![]() ![]() |
If the pedal never seems firm enough, check to see if the MC is flexing (rotating down at front) when you stand on the pedal. Some MC mounts are weak enough to flex, and prevent full transfer of pedal force into hydraulic pressure. If it flexes, then try adding a brace.
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