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Old 06-16-2011, 12:33 PM   #1
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only front brakes work

the brake light came on and wont turn off..ive checked fluid..and also tried bleeding the brakes..but thats when i noticed that the rear brakes werent getting any fluid since none came out when i tried bleeding them. what could be the cause?? thanks for the help guys

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Old 06-16-2011, 01:39 PM   #2
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Check the hard and rubber brake lines for something being kinked or collapsed.

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Old 06-16-2011, 01:41 PM   #3
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yea i did that..all the lines where fine..i also checked all the wheels to see if i had pressure..i bled checked all of them..and only the front would bleed..so i think it is the proportioning valve..is there any way to fix that..or is it just a replace type of deal?
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Old 06-16-2011, 10:33 PM   #4
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yea i did that..all the lines where fine..i also checked all the wheels to see if i had pressure..i bled checked all of them..and only the front would bleed..so i think it is the proportioning valve..is there any way to fix that..or is it just a replace type of deal?
It's actually a portion of the combo valve that's giving you grief now. There is a shuttle valve that shifts to stop leaks from causing brake failure and when shifted will also turn on the dash light.

You can try stomping the brake pedal hard a few times to see if that will equalize the system and shift it back where it belongs and if not, then you need to disassemble, clean it out with some brake parts cleaner and then reassemble it using some clean brake fluid as assembly lube.

Before you install it though, you need to flush the system to make sure that the sediment that fouled the combo valve is all gone.

If that doesn't fix it, post back up and we'll try something else.
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Old 06-17-2011, 02:31 AM   #5
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so today..the brakes completely went out (no stoping power besides E brake) pretty crazy..so i took it somewhat apart..disasembled the proportioning valve..took out the shuttle valve..and it has some severe wear marks on it..and feels really rough..is there any where i can get a new shuttle valve?
the plan now is to check the master cylinder to see if its getting enough pressure out of both lines to the proportioning valve..if not..ill be replacing that as well..
thanks for the help guys..id be completely lost without the imput.
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Old 06-17-2011, 10:33 AM   #6
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so today..the brakes completely went out (no stoping power besides E brake) pretty crazy..so i took it somewhat apart..disasembled the proportioning valve..took out the shuttle valve..and it has some severe wear marks on it..and feels really rough..is there any where i can get a new shuttle valve?
the plan now is to check the master cylinder to see if its getting enough pressure out of both lines to the proportioning valve..if not..ill be replacing that as well..
thanks for the help guys..id be completely lost without the imput.

Don't mix and match parts. With the whole system going out, you need to get a new combo valve and take that part out of the equation as not being part of the larger problem you're having. Go to the dealer and get one.
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Old 06-17-2011, 01:58 PM   #7
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so i finally got power, fluid to all wheels..but the brakes still feel pretty squishy..sometimes i have to step on it almost all the way to the floor..im assuming master cylinder?
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Old 06-17-2011, 10:36 PM   #8
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so i finally got power, fluid to all wheels..but the brakes still feel pretty squishy..sometimes i have to step on it almost all the way to the floor..im assuming master cylinder?
Squishy is usually a symptom of improper or incomplete bleeding.
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Old 06-17-2011, 11:44 PM   #9
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well i think i bled them correctly..i had my brother step on the pedal..i oppened the bleeder valve, bled it, closed it..then released the brake pedal..i did this around 10-15 time per brake until the stream of fluid had no bubbles. so im thinking it could be the master cylinder. cuz now the brakes somewhat work. but if i release the brakes and press it again and again it will just keep going further to the floor...i found a master cylinder and reservour for 55 bucks..so its not to much..im just gonna change that out and see if it help.

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