[bart6180]

on my 85 c-2500 for some reason when the truck sits for awhile my driver side rear brake grabs only when the truck is put in reverse, if i drive it for a little bit and then put it in reverse the brake works fine, only seems to happen when the brakes are cold. any ideas would be musc appreciated

 

[Crazeetxn]

Don't know the cause, but a couple of solutions may be to pull the drum off and spray some cleaner in there. That and bleed them.

 

[dsfloyd]

pull the drum and see if anything looks unusually worn. see if the springs, e brake cable etc are sticking

 

[stephan]

X2 on pulling the drum & having a look inside. My right rear did that for the first couple stops & it was slight surface rust on the drum causing it to grab. The root cause was the rubber plug for the adjustment hole was missing & allowing water ingress

 

[bart6180]

don't see anything in the drums,i've replaced the wheel cylinder, new springs,shoes are descent, new brake lines from the proportioning valve all the way back, new rear brake hose.