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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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fiacra |
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#2
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Person.Woman.Man.Camera.TV ![]() ![]() Group: Members Posts: 364 Joined: 1-March 19 From: East Bay Region - California Member No.: 22,920 Region Association: Northern California ![]() ![]() |
Motiv pressure bleeder, three quarts of brake fluid, periodically tap proportioning valve with a soft mallet, and tap the MC and calipers as well. I also bled both top and bottom bleeders. I know people say just to bleed the top bleeders because air should rise in the system, but I don't think it hurts to do both (someone can correct me on that if need be). Take it for a drive on a bumpy road, do it all again. That's what it took for me to get all the air out of the system after replacing my MC. Took a bit of time, but it worked perfectly. The brakes are better than ever.
This system bleeds very differently than our Bugs/Ghias do. They are much easier. |
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Lo-Fi Version | Time is now: 27th June 2024 - 11:51 PM |
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