I've had this problem off and on for a year now. My right rear brakes over adjust then they drag butt until I back them off. Then they over adjust again. All of the rear brake parts were brand new a year ago. new shoes new drums new hardware new parking brake cables. When my rear end went out I had the axle guys transfer all my new parts to the new rear end. Same problem. My next move is to get different self adjusters from a different store diff brand.

 

I still have this problem. Anyone have a clue? I have had 2 different mechanics look at it. They have turned the drums and readjusted. One cylinder got replaced. Problem returned. The past few days I scrounged up 2 used drums at the junk yard and I stripped all the self adjuster parts. I'm going to put that stuff in my van. I just wonder if the chinese drums from autozone warp easy.

 

Braking while reversing, or the emergency brake cable actuate the self adjuster. Are all those components in good shape and lubricated? Do you brake in reverse a lot? Is there more play on the shoes and springs on one side than the other?
Just a few thoughts....

 

so I got new brake shoes. Went to the junk yard tore off all the drum brake hardware off of 2 vans. picked the best out of the bunch and put it back together along with 2 drums I got from the junk yard. Problem seems to be solved.