brake pedal slowly goes to floor...

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Hey Everyone, My 99 XJ has a brake problem. I come to a stop with a low pedal & as I set stopped it goes on to the floor. In fact with the brakes floored it will even roll off! Just to cover the basics...Fluid-Full, No lines or wheel cylinders leaks. Vacuum line to booster is sealed with clamps. maybe some type of internal booster failure? Thanks, Dean

[spunebil]

sounds like air bubbles on lines. Bleed brake lines and it should be fine . Easies way for me , is to place containers at each wheel below bleeder valve, crack them open a little bit as brake fluid drains slowly, keep topping off master cylinder so it don't drain out . after a few minutes or whatever to drain air bubbles out, and then close back bleeder valves and then front ones. topping master cylinder when needed. Its the easiest way I have found to bleed brakes and clutch master cylinders by yourself, or if two of ya, where ya don't to PUMP pedal Over and Over ! ;)

[reward_1000]

That sounds like it could also be a master cylinder bypassing internally. When sitting at a stop and the brake pedal drops more that is a sign of a bad master cylinder.

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Sorry for the very delayed reply. It was the master cylinder slowly bleeding off. I went ahead & replaced the booster too. Thanks for the help.

[reward_1000]

That was a long delay, glad to know that you have brakes now though!