I have an 86 3/4t pickup that will stop on a dime and an 85 3/4t Suburban that won't. Both have identical brakes with the big 13" drums. To make it short, on the Burb,I have replaced lines,cylinders, shoes,mc, prop valve, and bypassed the height valve. Basically everything I could think of.
I have "searched"brake issues and on a couple of them it mentions to make sure the primary and secondary shoes are placed correctly. How do I know which is which and what happens is they are reversed? I might go through the hassle of pulling the drums to check but I would like to know how to tell if they are correctly placed.