Ford F-250 1999 Diesel Crew Cab Brake failure w/ABS light on
My truck brakes has been failing at low speeds for a year or so and no one can seem to figure out why. Now the brakes are faling at high speeds as well where I have to let off and then re apply the brakes for them to work and the ABS light has been coming on. This is what happens when the brakes fail at slow speeds typically when I am turning I will feel a flutter in the pedal and I will have no brakes by re applying the brakes they will function properly at the high speed I will feel the flutter in the pedal as soon as I touch the pedal while driving straight.
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Sounds like the abs system has failed and the brakes are applied. The abs system applies pressure to the wheels when needed to prevent wheel spin. If the equalizer valve sticks or the system is not able to release the brakes will lock on. I would start with a scan for trouble codes.
ABS light tells you that there is some problem with the brake system like you have forgot to release the emergency brake or its time for you to change the brake fluid. Ford recommends to change the brake fluid every year.If you have recently refilled the brake fluid , check for any leaks.Abs light indicates that your braking system needs to be serviced.
You need to crawl under the truck and inspect each brake line for leaks. You also need to check wheel cylinders and calipers. The chances are pretty good that you will find a small leak in a line or a wheel cylinder leaking, pay close attention to the rear of the truck because that is normally where these problems occur. Hope this helps.
Your cruise control is based on speed sensors and if you have a bad speed sensor then it will not allow the cruise to function as a sefety precation. Have a garage test yo ABS speed sensors. I wuld suspect the rear sensor in the diff.
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.