Question about 1992 Chevrolet C1500

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Did brake job on 1992 chevy pickup, how do I release proportional valve?

Can't bleed brakes

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  • brian c
    brian c May 11, 2010

    Can you be more specific?

  • Anonymous Mar 30, 2014

    where is the proportioning valve

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Some times you get an air bubble and you just cant get it to pass. you can work very hard and still not get it to bleed. snapon sells a bleeder system that sell for around $500 but i can tell you how to build one for under $20. if interested. but your answere is to back bleed the system from the farthest away wheel first. and then your peddel will come back.

Posted on Aug 23, 2008

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Sounds like a problem with the proportioning valve. Try not to push the pedal down to far when bleeding. The valve sounds like it is getting stuck closed, and takes a little bit to release and allow fluid to pass again.

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Sounds like your proportioning valve is stopping up. try opening the bleeder on a wheel cylinder, and kick the brake pedal hard a couple of times. Soimetimes this will free them up.

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The proportioning valve most definately can be the problem. Did you change it or is it the original? (A disc/drum system uses a 70%front/30%rear braking ratio, whereas an all-disc system is alot more even). I would first bleed the master cylinder. Then I would 'gravity bleed' the rest of the system by opening the bleeders on all 4 wheels. Do not at any point let the m/cylinder go dry. Also, do not touch the brake pedal.
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Pump the pedal to 'self-adjust' the rear calipers, then re-check the fluid level.
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Sounds like the proportioning valve is stuck. You may need to break a front bleeder loose and hit the pedal the unseat the valve. Then blead the rearbrakse and then bleed the wheel where you broke the bleeder loose. That should work.

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