Brake Issue

[smpoulin1]

Need a bit of help, my front brakes get "grabby" and very sensitive after driving in stop and go traffic and sometimes my rear brakes act like the emergency brake has been set after parked for a while. If you set the e brake and release, the truck will roll as it should. I have checked the rear shoe adjustment several times and they are not over tight, I have also checked the e brake cable tension and it is loose when not set. I have replaced the master cylinder, the proportioning valve, all 3 rubber lines, blown all hard lines out/checked for obstructions, the pads/shoes, both front calipers and pads, and both rear cylinders and shoes. Only item I haven't replaced is the power brake booster. Any ideas where to look next?

Thanks in advance.

 

[Sad Sack]

Check / replace rear wheel cylinders.

 

[fast 99]

Friction material varies between manufacturers. If a temp gun is available it might help narrow down where the problem is. Sounds like there may be more than 1 issue.

Ran into an odd brake problem recently. Rear backing plates were worn on the rubbing block enough to stick the shoes. Only reason I toss that out is these trucks are getting old. Weird problems are showing up.