if you put a clamp on the shoes to stop them from pushing outward, you can have someone step on brakes to check for leaks. I would clean everything up real good first. I have never rebuilt cylinders. I think paying for them is easier. Plus if it still leaks, you'll have to buy one anyway. I like new with warranty, but don't know about anybody else.

99 Sportage 2Dr, 1.5" body lift, 30x9.50 Cooper M/T's, high lift, CB, custom bumpers, Warn manual hubs, Tom Tom GPS, snorkel.
99 Jeep Cherokee 3" lift, 31" mud terrains