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Old 04-16-2009, 06:08 AM
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Brake Issue

So I replaced the front disc brakes on my 87 yj 4.2L I had pressure but when I hit the breaks it was wasn't breaking very hard so I bled the brakes at witch I had to pull the bleeder screws and clean them out cause they were clogged with crud so the rear brakes were not adjusted just bled then in the rear no matter how long I kept bleeding them they wouldn't get a heavy flow of fluid. well when I get the brakes nice and firm and start up the jeep I loose all pressure and it's right bake to normal I know your thinking brake booster well I tested it according to the manual it said it was fine holding pressure correctly I'm clueless what could cause this pressure loss
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Old 04-16-2009, 11:43 PM   #2
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I'm having the exact same problem in my 90 2.5..Can't figure out what's going on. Except, If i am easy on the brakes for about 15 or 20 second, say rolling to a stop sign, my brake light will come on, or when im sitting at a red light for anything more then 20 seconds. I was also thinking brake booster, what manual tells you how to test it? The original Jeep manual, or a repair manual? I don't have the original one. I'm gonna check the booster tomorrow. If i come across anything else i'll let you know!

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Old 04-17-2009, 10:08 AM   #3
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You need a master cylinder! If the brake booster (it being a vac. booster) were to go out your pedal would be extremely stiff (you would have manual brake) but still have good pedal. Also, every time you pressed the pedal the engine would likely die due to large vac. leak. I have run into this prob. before. P.S. Dont forget to bench bleed the new master cylinder!
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