Question about 1991 Ford F350

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Brake pedal keeps creeping down, but there are no leaks.

I HAVE CHANGED THE MASTER CYLINDER 4 TIMES ON MY 1991 FORD F350 TRUCK. THE BRAKE PEDAL STILL KEEPS CREEPING DOWN, WHAT SHOULD I DO NOW?

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  • Woody J Hiatt May 11, 2010

    The Vacum booster may be leaking air.

    Thre may be air in the lines

    Are you loosing fluid?


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Check your brake booster and also make sure the rear shoes are adjusted up where they belong. If they are not adjusted up the brake pedal will go farther and farther toward the floor and get spongier as they go farther out of adjustment. If you adjust them up and they back down again change your self-adjusters and springs. They are readily available at your local parts store.

Posted on May 10, 2009

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1 Answer

How do you know if master cylinder is bad


hello robj502My name is Roger and I will help you. A general rule of thumb is to pump the brake two or three times. Hold steady pressure on the pedal. Do this with the engine off. The brake pedal should hold firm. Should the pedal creep toward the floor board you either have a leak in the brake system or the master cylinder is by passing. Should you be loosing brake fluid look under the car at all 4 wheels. If you have fluid leaking on any of the wheels you most likely found the problem. If you cannot detect any where under the car. I would suspect the master cylinder. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya.Roger

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Hi. I have a 1990 Ford F350 diesel UHaul with no


when you replace the master cylinder, your are supposed to pump it up manually before you install it. If you don't, you'll have to sit there and pump the brake pedal a couple of thousand times as one almost microscopic air bubble at a time escapes the pressure tube and back fills with fluid. once you can push the pedal repeatedly without any bubbles escaping into the reservoir, then bleed the brakes. Starting with the farthest, usually the Right Rear and work your way up. Make sure you keep the fluid level topped off. If it sucks air once, you have to start all over.

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With no leaks and a little braking action returning by pumping the pedal I would suggest looking into a master cylinder. Low brake fluid level in the master cylinder will cause the brake warning light to illuminate (possibly, also the ABS light).

If the truck has the 7.3L diesel, it will have a vacuum pump which supplies vacuum for all vacuum accessories. I believe if the vacuum level drops below 10 in. of Hg, the brake light will illuminate. If the vacuum pump fails you'll know it as the brake pedal will require quite a bit of effort to effect any braking effort.

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1 Answer

Changing a power brake booster off a 84 ford f350 truck


Pretty simple repair.I even did this alone.
DO NOT disconnect the brake lines unless you are changing the master cylinder out with it. Unbolt the master cylinder and move it forward slightly. From inside the truck,unbolt the brake pedal from the rod, leave the pedal hanging. Remove the 4 bolts at the firewall that retain the booster.From outside the truck reach in and draw the old booster out.You may have to move the master cylinder up or down to clear the booster.
The rod to the brake pedal will come out with the booster,make sure you put it back on the new one.

Reverse to install.

good luck
Dave

Jun 14, 2008 | 1984 Ford F 350

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