Question about 1998 Ford Explorer

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A master cylinder has a restricted compensator valve what problem will i most likely find with the pedal?

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  • boniface_dal May 15, 2009

    pointed me in yhe right direction

  • Ned C Cook
    Ned C Cook May 11, 2010

    compensator or proportioning valve? to make sure we speak of the same part and why do yo feel there is a restriction?

  • blueextc3221
    blueextc3221 May 11, 2010

    hard to press down

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  • Master
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If your valve becomes defective then the brake pressure ratio to the front and the rear brakes will change. You will see or feel a difference. the front-end may nose dive or lock-up. The rear brakes may react the same way.

Posted on May 12, 2009

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  • Ford Master
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It sounds like we are discussing a proportioning valve.first indication would bemore brake wear on one of the two axles, or like the man said, hard stops will cause nose dive or slow or lazy feeling brakes if its the rear working. I doubt it is a restriction but just a repositioning of the valve.
To correct or better said balance the proportioning valve, follow these steps. If you can determine which axle is doing all the braking, do so. Then look at the proportioning valve and you will see a pin protruding on one end. That confirs the valve is not centered. The way to center it and get your light on the dash to go off is as follows. Make sure wire is on the valve. Light should be on. Have some start the engine and press firmly on the brake pedal. Do the rear first. with pressure on the pedal, open quickly rhe brake bleeder . a click should be heard when the valve resets. Person on pedal should notice the light go out.. chk valve for pin no longer protruding. Do it twice if needed but make sure there is firm to hard pedal pressure. Check your fluid level. ALWAYS PROTECT YOUR EYE FROM THE BRAKE FLUID IN THIS PROCEEDURE.. iF THAT DID NOT RESET THE VALVE, tHEN YOU MAY HAVE TO DO THE FRONT SAME WAY. ccREATE LEAK ON AXLE THAT IS DOING ALL RTHE WORK.
When you get it right the light will go out - good luck

Posted on May 15, 2009

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Back to bleeding the rear brakes first: As someone pumps up the brake pressure, making sure the resivoir stays full, with the cap on between bleeding, and have the person pressing the pedal to do these thngs.
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2. Never release the pressure on the pedal after bleeding a brake, until the line is tightened, then release slowly to prevent air from getting into the fluid.

You should of course get fluid at the master cylinder when you bleed it (or just replace it), then you'll need to bleed the line at the right rear wheel (first) a few times to get fluid if it's been leaking, then the left rear wheel. If you get pressure but no fluid to the rear and the master cyliinder did have pressure released when you bled it, there is either a restriction in the line itself, or the porportioning valve could be damaged. (unusual for the valve to go bad actually, inspect lines for damage such as being pinched if you're getting pressure but no fluid.

Final test if it hasn't been resolved-remove lines at porportioning valve & make sure fluid is leaving/entering there as it should. If you find it defective, a good replacement can come from a salvage yard, or you can buy them new.

Brake fluid on the floorboard under the dash near the brake pedal=bad Master Cylinder.

good luck

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