Sorry I have to chime in here guys...
Brakes on a med/heavy chassis truck are nothing to short-cut ...
It's OK if your 14,000lb truck won't go, but it's NOT OK if it won't stop... that's a recipe for a bad day at the office.
It doesnt matter what the cylinder 'looks' like, it MUST be honed with new piston/seal placement ... even if you use the two-finger method.
Brake lines can be inspected for abrasions/corrosion and fitting integrity ... if all good, flush and put them back to work.
Wheel cylinders should be re-built or replaced.
with all respect
-Hd
