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Old 06-16-2011, 11:59 AM   #1
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no rear brakes..

hey guys..so my gf's jeep has been acting up..first the brake light came on..and wont turn off.so i checked fluid..then decided to blead the brakes..so i started on the rear..and to my luck..nothing came out..im assuming its the proportioning valve.??! if so..can i reset it someohow...or would i have to replace it? thanks for the input..

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Old 06-16-2011, 01:15 PM   #2
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Maybe. Could also be a faulty ABS unit (if equipped), a broken line, or faulty master cylinder too.

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Old 06-16-2011, 01:21 PM   #3
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Quote:
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Maybe. Could also be a faulty ABS unit (if equipped), a broken line, or faulty master cylinder too.
well it doesnt have ABS. i checked all the lines..they all look good and no leaks. is there any way to check the proportioning valve?
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Old 06-16-2011, 01:21 PM   #4
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I read this on a truck forum, but should apply:
Open all 4 brake bleeders and pump the brakes. The thinking would be if it was leaking on one side it would adjust to the good side. if both sides were leaking it should center itself as it tries to close both sides off.

The line is also relativly easy to follow, so start at the rear brakes and go forward and see if you see anything obviously wrong (unless its under the skit plate, that can be hard to see)
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Old 06-16-2011, 01:28 PM   #5
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Took a shot since you didn't say what kind of jeep she has. ?

The proportioning valve splits the fluid between the four wheels. Check first if you have pressure ahead of the valve. Open the line slightly from the master to the P valve, have someone apply brake pressure and hold it. If you have fluid under pressure, it sounds like the P valve, which is rare. If you get no pressure ahead of the P valve, you got a bad master cylinder.
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Old 06-16-2011, 01:33 PM   #6
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oh my bad..should of posted that..if it helps any..its a 04 wrangler x series..
but i think the pressure is fine..cuz after not getting anything from the rears while trying to bleed them..i decided to check the fronts and they had a nice hard stream of fluid..so i think the master cylinder is fine..or at leat i hope so..lol
but ill check it how you said and see how that goes.. thanks
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Old 06-16-2011, 01:59 PM   #7
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You have a split master cylinder on your jeep. One half feeds the front brakes, the other half feeds the rears. You can have fronts an no rears, or visa versa, it's designed that way, so if one side fails on the master, the other will still work.
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Old 06-16-2011, 07:31 PM   #8
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so things got a lil worse today..she was drivig it..and all of a sudden no brakes...so im gonna go get a proportioning valve and start from there..any advice on the swap..hopefully its as simple as it sounds..swap bleed..thanks for all the help guys

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