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OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

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Old February 16th, 2019, 13:14
93blackxj 93blackxj is offline
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porportioning valve leak

My son wore through his front brakes, popping a piston L/F caliper. Replaced all brakes, but couldn't gravity bleed R/F caliper. Tried to force bleed the caliper to no avail. Started Jeep and depressed brake pedal feeling there was a leak to which i thought it was a bad master cylinder. saw that the porportioning valve was leaking through the light switch. Anyone have any info on this or have repaired one? Watched a couple of videos onYoutube that were helpful, but not XJ. '93 Sport
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Old February 16th, 2019, 14:10
lawsoncl lawsoncl is offline
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Re: porportioning valve leak

It's a damaged o-ring inside of the prop valve. Here's what they look like internally (pic is of an MJ valve). The switch plunger should be isolated from the brake fluid by the o-rings on the slide.
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Old February 17th, 2019, 06:46
93blackxj 93blackxj is offline
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Re: porportioning valve leak

Thanks for pic very helpful.
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