The anti-lock brakes haven't worked in a long time on my '97 F-150.

The ABS light comes on when it's been parked outside on a hot summer day, but never at any other time. The rear wheels will lock up solid under heavy braking on slick surfaces. There's no indication that the anti-lock system is ever kicking in.

I hate to go to the dealership for this. Is there anything simple I should check out or replace before I take it in? I know this must have been discussed here before, but I've searched the forum archives and I haven't found a similar problem being discussed.

Thanks,

Greg

 

check your speed sensor on the top of the pumpkin on your rearend...also check to make sure the connections are clean where they plug into the master cylinder and also the porpotioning valve