when brakes sit for a while moisture from the air condinsates on the inside of the brake shoes or pads rusting the pad or shoe to the rotor or drum. most of the time a good whack with a hammer can break the rust and they start working, just beware not to crack the drum or rotor in doing so. quick fixes are usualy not the best when it comes to brakes. rust may cease up the inner workings and cause them not to adjust up properly resulting in brakes not adjusting up when they need to according to wear. they may also lock up while driving because the components are not sliding the way they should be. i would suggest breaking down the entire assembly and inspecting all components, using a wire wheel on a bench grinder to buff the rust off of them. so you will be assured all components are working the way they should be.
