EverydayDiesel

It seems to be when I hit a bump then my ABS/BRAKE lights will turn on and when I hit another bump they sometimes turn back off.

If I am stopping and they start flashing on and off, then when the lights are off the pedal seems "spongy". But when the lights come back on they are back to normal.

I have replaced both of the ABS sensors about 500 miles ago because the lights were on all the time.

Any ideas on what to trouble shoot?

Cougsfan

The first thing I would suspect is your stop light switch mounted near your brake pedal. Those things seem to go south fairly often. I had a similar experience. I found if I pulled the brake pedal up with my toe, My ABS Brake light would stay off. I screwed around trying to position it closer to the brake pedal, but gave up and bought a new one, which fixed the problem. Don't remember what it cost, maybe $17 or so.

EverydayDiesel

ill replace it, would the stop light switch cause the abs light to come on and off intermittently?

Cougsfan

It did cause mine '96 to come on and off intermittently. I am sure that there could be other reasons, but if a bump causes it to come on, it seems the most likely suspect.

Shovelhead

Mine was doing the same thing last summer.......'bout drove me nutz.

My problem was caused by the ABS wire harness from the rear wheel speed sensor rubbing on the driver's side emergency brake cable.
It had rubbed clean through the outer sheath of the harness, through the insulation on one of the wires and through the plastic outer sheath of the E-Brake cable.

Reinsulated everything, tied up the harness to prevent rubbing, and haven't had a problem since.

oilfield-trash

Your abs sensors are located in your front hub bearing assembly. A lot of times if you have a front hub going out it will cause the ABS light to flash.

just a thought

Your abs control module (has all the metal tubes coming out of it) will also cause ABS light to flash. This very seldom goes out but you might check this out also.

EverydayDiesel

Thanks for the help. I finally found the problem on the drivers side...the upper control arm had cut the wire in half. I soldered a little bit more of wire to get it out of the way. It works great now. Thanks for the help