New ABS Problem

[alghamedGT]

Thanks my friends for all your helps
today i noticed that the abs has engaged when i just touch the brake pedal without pushing hard and a few minutes later the abs light is on
the strange thing is when shuting engine and start it again all thing works great for a few minuts then the funny feeling in the brake begin to show again

sorry for my very bad english

[compu_85]

You have a bad abs sensor, or a bad abs tone ring. The abs computer is fairly dumb, every time you cycle the key it resets and forgets about the bad input.

-J

[86-300sdl]

You may also want to make sure the sensor and the multi-tooth crown (tone ring?) on the inner side of the rotor is clean.

I had some road debris break the sensor wire, and the brakes acted very odd. Fixed that and still had similar symptoms as you. So I pulled each the sensors and cleaned them up, and the "tone ring" on the inner side of the rotors (which were caked with crud) and all was well.

There are also a couple of "ice cube" relays under the plastic ABS unit cover that may need attention.

[alghamedGT]

I just cleaned all 3 sensors and also the 3 tone rings
but this abs problem dont want to go away
i dont know why
i also checked the red relay and it seems that it working fine

[babymog]

Are all of your tires the same size and properly inflated?

[sixto]

Does the problem come back immediately if you reset the ABS by disconnecting the battery for a few minutes?

Sixto
83 300SD

[86-300sdl]

The wire coming from the a sensor may be damaged.

I had to slice / solder in a new section on my left front. I may have damaged it tying it out of the way when replacing front end parts. They can get kind of brittle over the years.