1991 Ford Ranger

I have a 1991 Ford Ranger w/ABS rear drum brakes. The rear brakes lockup especially on wet pavement. I believe the left rear brake is one that locks up. And yes the anti-lock light is on. Any suggestions?

The ABS light means there’s a code stored. Give this link a read:

http://www.aa1car.com/library/abs_kelseyhayes_rwal.htm