Brakes
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Brakes
I have a '91 f250 diesel 4x4 with a brake problem. after it sits a day or two the brakes have pressure but as soon as you start the motor the resistance in the peddle goes to nothing and the peddle hits the floor.
I have replaceineptly lines on the front, rebuilt and cleaned the calipers, 99% new fluid, and replaced the right rear wheel seal, and bled the system several times.
when I got the truck the brakes hung and would get tighter the longer you drove it. The po replaced the right front caliper, booster pump, and master cylinder.
Please help haha thank you
I have replaceineptly lines on the front, rebuilt and cleaned the calipers, 99% new fluid, and replaced the right rear wheel seal, and bled the system several times.
when I got the truck the brakes hung and would get tighter the longer you drove it. The po replaced the right front caliper, booster pump, and master cylinder.
Please help haha thank you
Lead Driver
Joined: Mar 2006
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From: western SD
It sounds like a master cylinder to me even though it was changed. It wouldn't be the first time a bad one was found out of the box. Was it a rebuilt or a new one. For the price difference I go with new.
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Joined: Oct 2007
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From: Faibanks Ak.
Usually if the brakes won't release, it is a caliper sticking, but i did change a master cyl once and the rod was too long. This let them roll until you hit the brakes and then it would hold a small bit of pressure.
It sounds to me like you need to adjust your rear brakes.
It sounds to me like you need to adjust your rear brakes.
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I adjusted the pushrods also a few weeks ago. It was about a half inch to far in. I will check the rear brakes also
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Post Fiend
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From: Faibanks Ak.
When you crank it, your power gets to it,and it is easier to push the pedal, any vehicle with power will drop the pedal some when you crank it. If you didn't adjust your rear brakes when you installed new pads on the front, it is not unusual for the pedal to go to the floor. Will it pump up and hold steady, if so your rear brakes need adjusting.
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The pushrod from the booster is the Oneida adjusted to specs(may have exaggerated on the 1/2")
And I havent adjusted the left rear pads yet but the right is correct.
When the truck starts the peddle goes about 3/4's the length of its travel. Then, it does not pump up any. It may have a tiny bit at the very end, just enough to slow the truck at 10mph, but NO more.
Could it just be there's still air in the system?
And I havent adjusted the left rear pads yet but the right is correct.
When the truck starts the peddle goes about 3/4's the length of its travel. Then, it does not pump up any. It may have a tiny bit at the very end, just enough to slow the truck at 10mph, but NO more.
Could it just be there's still air in the system?
Post Fiend
Joined: Oct 2007
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From: Faibanks Ak.
If the rod is adjusted right to the master cylinder it should pump up, if it bleeds back down while you are holding pressure on it, the master is bleeding off, if it pumps up and feels spongy, their is still air in the system.