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? |
Cairo94507 |
May 20 2024, 09:46 AM
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#2
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Michael Group: Members Posts: 9,860 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California |
Pressure bleeder first for a couple trips around the car. Remember you start with the furthest nipple from the master cylinder and work your way closer to the master cylinder as you go. Right rear, proportioning valve rap with rubber mallet, left rear, right front, left front. Then switch to the old-school method of having an assistant pump the brake twice and hold it down while you release the valve and let air out and then lock it down and do it again until the air in that line is out. Work your way around the car, don't forget to top off fluid as you go, then after clean fluid is coming out with no air, one more trip around the car. If you have a brake proportioning valve, don't forget to bang on it with a rubber mallet a couple times to dislodge air trapped in it as you go around the car. (IMG:style_emoticons/default/beerchug.gif)
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