More help on this one...Silverado (G.M.) had the same problem when they went to rear
disc brakes on the '01 model. Internal drum on the parking brake (rear). Many T.S.B.'s
on this one from G.M. I'm guessing Ford is simaliar. The internal parking brake release
spring is weaker on an internal disc-drum-parking brake set-up than it was on the old rear
drum brakes.(Limited area/size to fit the spring, etc...) Which means less spring tension,
release pressure, etc. Not sure if our ST's have an external spring mounted on the
parking brake cable under the truck, or what. Till you find out, don't try a puller, as this
may do more harm than good. To add to RichardL's good advice, try this:
Jack up ST from rear:
Remove suspect rear wheel and tire assembly(ies):
Visually inspect brake assembly (ies) for rust/corrosion:
Remove rear caliper (given you have rear discs):
Attempt to remove rotor:
If rotor does not come off easily, use gentle pressure with a rubber mallet or dead-blow
hammer:
Once off, do brakes as you normally would (if they need replacing).
When replacing drum or rotor, use a little bit of Silver or Copper Lube, as we Old-Schools
use to call it, on the flange, or mating surface of the drum or disc-to- rotor backing
surface,on the axle hub, to prevent further problems when removing the rotor or drum
again.