When its rainy or has rained, etc my rear end locks up really really easy. I barely touch the brake pedal and the brakes lock up and cause me to go into a skid.

Is there moisture getting in somewhere where its not supposed to be? My "rear anti lock" light on the dash is always on its only gone off a couple times in the three yrs Ive owned the truck.

Any help?

I got an 87 f150 300-six 4 speed 4x4 with mud tires.

 

Grabby drum brakes (especially when wet) are usually caused by contaminated shoes. A leaky axle seal or wheel cylinder will soak the shoes... there is no cleaning them up, replace them.

 

I agree with the statement from bashby.

The other side of this coin is you already know there is fault in the rear anti-lock brake system. Now you are bi**hing because your brakes are locking up. Perhaps you should address the root cause of why the fault light is on.

Look at the info in Post#2 from my good buddy miesk5 in this thread from another forum: Rear anti-lock and brake light come on. - Ford Bronco Zone Early Bronco Classic FullSize Broncos

 

ok thanks for the posts, i replaced the shoes probably 2 yrs or more ago, As far as I know its not leaking but Ill look into it.