I've had this problem before and thought I had it licked but I don't.
I have a 46 Chevy 1/2 ton with huck brakes, when I got it I rebuilt the master cylinder, the wheel cylinders, installed new brake shoes and replaced the hoses and the front drums. I also replaced the steel line running to the rear.
Now when I run the truck around town and warm it up the brakes slowly tighten until they completely lock up (all four wheels!).
The first time this happened I thought I had the brakes adjusted too tight and I thought the heat expanded the fluid and locked them. I readjusted the shoes and now its doing it again.
Is there something not releasing in the MC? Too much fluid?
I'm stumped, any help would be greatly appreciated.
