truck is a '50 chevy 1/2 ton. can anyone tell me if there should be brake shoe hold down springs on my front shoes? when i took off the front drums/hubs neither side has them. in the shop manual it refers to the springs, but has (1948). The shoes seem to be connected via a linkage that connects the articulating linkage to four bolts in the backing plate. is this the correct set up? thanks for your help