Question about 1990 Chevrolet C1500

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Can't get rear brakes to bleed on a 4.3l 1990 chevy scottsdale front fine

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Should check for blockage remove line try to blow air thru it with air hose

Posted on Sep 08, 2010

  • phstein67 Sep 08, 2010

    also check wheel and slave cyclinders

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1988 Chevy scottsdale front brakes locked up brake fluid full help


If your brake hose collapsed internally that will cause brakes to lock to be sure its the hose and not the calipers open the bleed screw and see if the rotor release. If they stay locked then maybe calipers seized try to pry brake pads apart with caliper mounted and brake bleeder open if they return easy then change your brake hose.

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http://www.aa1car.com/library/2003/bf90347.htm

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Brake bleed sequense


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I bleed the rear brakes just fine, but as soon as i tried to bleed the fronts i lost the ability to get pressure on the pedal. so im stuck


Make sure the master cylinder fluid level is not empty,
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did you see if they need replaced?
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Brake Pedal goes to the floor in my 1990 Chevy C1500 Scottsdale


do you have a self bleeder kit? first off, you have to bleed the master cyl back into its self and the combination valve before you go to the wheels. when you do that, I think you will find that you have air in the lines. disconnect both brake lines from the master cyl and put the bleeder kit fittings on the master cyl, then put the rubber tubing with the kit on the fittings and submerge it in the brake reservoir. make sure its full. then pump the pedal until you get a hard pedal. if that is the case, reconnect the lines to the master, then have an assistant pump up the brake pedal with the engine off, and bleed the combination valve which should be connected to the master by steel tubing. pump it up, then hold it down, and crack the fittings loose, one at a time until the pedal goes about half way down, but do not release the brake pedal until the line is tight again, otherwise you will **** air in the lines. after you do all that, go to the farthest caliper or wheel cylynder from the master and bleed that with the same technique,and dont release the pedal until you close the bleeder screw. unless you have a major prob, this will work.

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Check out this link & read about combination valve & how to center it when bleeding.

http://www.autozone.com/addVehicleId,1321403/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528007a632

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