Hi, I believe my rear drum brakes are locking up whenever I reverse at an angle. Reversing straight is fine. I recently had a buddy who has been ASE certified in steering/brakes/suspension for over 30 years replace my rear brake shoes, drums, and hardware; wheel cylinders weren't leaking. Everything was working fine up until a few days ago. I think something came apart or the adjusters are messed up. I can reverse at an angle maybe 5 feet and then it instantly locks up completely as if I just hit something. Please help this truck is my only covered transportation and it may rain soon.

 

Problem discovered... Just as I was planning on replacing the front brakes (worn to metal) the pistons came too far out of their bores on the right-front and seized up. Looks like I'll be buying new calipers.