Hippie66 Posted January 20, 2017 Share Posted January 20, 2017 Most likely cause of break pedal becoming soft after a panic stop, no signs of leaks at any of the wheels? I'm thinking master cylinder... They worked great just prior the panic stop, locked up all 4. Link to comment Share on other sites More sharing options...
895XJ Posted January 20, 2017 Share Posted January 20, 2017 Sounds like you sucked the reservoir dry Sent from my XT1635-02 using Tapatalk Link to comment Share on other sites More sharing options...
desbennett004 Posted January 20, 2017 Share Posted January 20, 2017 Distorted "break" lines? Sent from my SM-N900W8 using Tapatalk Link to comment Share on other sites More sharing options...
Hippie66 Posted January 20, 2017 Author Share Posted January 20, 2017 Reservoir is almost full, no chance it was sucked dry. Brake lines are not distorted. No leaks to be seen anywhere. Link to comment Share on other sites More sharing options...
desbennett004 Posted January 20, 2017 Share Posted January 20, 2017 How old is your brake fluid? If it's got moisture in it, it would have boiled off and caused your pedal to feel spongy. If you do a flush, it might fix the problem. Sent from my SM-N900W8 using Tapatalk Link to comment Share on other sites More sharing options...
Hippie66 Posted January 20, 2017 Author Share Posted January 20, 2017 That's not going to happen from a single panic stop. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 20, 2017 Share Posted January 20, 2017 The shuttle for the switch on your brake proportioning valve is probably stuck from your slamming on the brakes and needs to be reset. Disconnect the wire from the switch on the prop valve and see if the light goes out. If it does, there's the problem. Not driving, you have to press HARD on the brake pedal until you hear a "pop". One quick stomp should reset it. Nice to know info: Possible brake warning light causes:1. parking brakes are applied2. very low pedal3. low fluid level4. excessively worn brake lining5. there's a pressure differential between the front/rear hydraulic systems Link to comment Share on other sites More sharing options...
Hippie66 Posted January 20, 2017 Author Share Posted January 20, 2017 No brake warning light. It comes in when cranking the engine, goes off as soon as it starts. Link to comment Share on other sites More sharing options...
Eagle Posted January 20, 2017 Share Posted January 20, 2017 Check the two front and one rear flex hose. The panic stop may have ruptured the inner membrane but not (yet) blown out the outer. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 20, 2017 Share Posted January 20, 2017 No brake warning light. It comes in when cranking the engine, goes off as soon as it starts. Damn - I thought I read you had a brake warning light. :headslap Yeah, probably blew a master cylinder seal. Might be a good time to do the 95/96 XJ master cylinder / brake booster upgrade if you haven't already. Link to comment Share on other sites More sharing options...
Hippie66 Posted January 20, 2017 Author Share Posted January 20, 2017 Hornbrod must have nailed it. I couldn't get it to reset at first. Applied parking brake and hit it again, pedal is back to normal. Took it out for a few hard stops at different speeds, everything seems fine. I do know the rear brakes are out of adjustment. I'm going to fix that after the insurance adjuster looks at the truck. Link to comment Share on other sites More sharing options...
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