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Leaky Master Cylinder woes
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Posted: 09/07/09
09:45 AM
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I just replaced my master cylinder about 6000 miles ago because it was leaking where the actuating link enters the bore. Now that replacement is leaking. It looks like the brake fluid is making it's way from the rear brake resevior to the front brake resevior and overflowing it. Has anybody got any ideas? My Jeep has discs up front, drums in back, and as far I know it came from the factory like that in '79. Could there be a problem with the proportioning valve? Am I getting crappy replacement parts? Any help would be greatly appreciated. Thanks.
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ftgiles
Addict
| Posts: 2178
| Joined: 05/08
Posted: 09/07/09
02:53 PM
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There are two places that the fluid can backfeed. One is a leak in the master cylinder between the two pistons. The other is a leak in the pressure differential switch.
The pressure differential switch is between the metering block and the proportioning valve. It will have an electrical connector. The metering block has 2 lines to the front brakes and the proportioning valve has one line to the rear brakes.
The differential switch contains a piston that slides back and forth triggering the switch if the pressure on one side of the piston is greater than the presure on the other side of the piston. So if this piston seal leaks, backfeed will occur.
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