Been bleeding brakes for nearly 20 years

1998 JEEP WRANGLER
120,000 MILES • 6 CYL • 4WD • MANUAL
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DCLINE30
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Just did a drum to disc conversion on rear brakes. Been bleeding brakes for nearly 20 years. I can't get these brake to keep pressure no matter how much they are bled. There is no leak in the line anywhere. Jeep is off and I can build pressure then I turn it on to test and the pedal goes to the floor. Any thoughts?
May 10, 2008 at 1:20 PM
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BLACKOP555
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suspect a bad vacuum booster maybe, could also be the master cylinder not being able to work with the back brakes? maybe issue with ABS if equipped. Here is a video and guide below to help you bleed the brake system correctly.

https://youtu.be/w7gUsj2us0U

and

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

and

https://youtu.be/WDxvEQrMkBg

Please run down these guides and report back.
May 10, 2008 at 8:41 PM