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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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emerygt350 |
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#2
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,209 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States ![]() |
Great to hear it. I had my son pumping the brake for me this morning and we made some real good progress. I think this must be the 3rd bleed since last August and finally all the air is out. I had him really put the pressure on when we did the rears. Didn't see much for bubbles but the pedal is better than it has ever been. I really think you have to drive the crap out of it and bleed it again and again.
Speaking of that, what size are the stock front bleeders? I always end up using a vise grip. |
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