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Old November 16th, 2013, 02:58 PM   #1
mdelbello
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Default Brake problem

I have a 1978 CJ5 258 6 cylinder. I installed a 2.5" suspension lift and realized that I needed to extend brake lines. I extended front lines and bled system with no problems. When I extended rear brakes, I had to remove back nut from proportioning valve to get line off. After replacing rear lines, I cannot keep any pedal. I have since replaced master cylinder (twice), and installed a new proportioning valve. I have bled the system countless times but still cannot keep any pedal. There are no leaks that I can see anywhere. Any thoughts or ideas would be greatly appreciated.

Thanks in advance.
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Old November 16th, 2013, 03:25 PM   #2
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bleed the system from the farthest wheel first
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Old November 16th, 2013, 06:41 PM   #3
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did u bench bleed master? there is a valve in the proportioning valve that you can pull to help bleed air from it its a pin in one end of the block
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Old November 16th, 2013, 09:09 PM   #4
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Look at your old proportioning valve and you will see a plunger that slides on a brake failure. If it is in the rear position on your new valve, it will prevent fluid from freely entering the rear line. You will need to push the valve forward. Typically on an old Jeep, after you beed the master, you can leave either of the bleeders open on the rear, and gravity will feed the lines. My other guess would be to make sure that you tightened the adjusters on the drums. If not, you will not get a firm pedal.
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Old November 17th, 2013, 12:13 PM   #5
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Yes, bled from farthest to closest. I assumed that the new proportioning valve would not require any adjustments. Also did bench bleed master.
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