Basically it will pull to one side (into oncoming traffic) On two occasions, the wheel locked up and overheated after a life or death hammer on the brakes... Right now, its not too bad and it isnt pulling.
Brake hoses are weird, they act like one way valves when they fail. Fluid go in, doesn't come out keeps the piston applied until it cools. But that is usually a permanent problem not an intermittent one. Probably a rusty caliper piston dad says.
Haha... $12 on a $500 order? Thats a pimp discount, Rock Auto not even worth it... I'd like to spend about $600 and redo the brake hoses, the calipers and the lines, the rotors, the hub bearings and all 4 of the driveshaft u-joints, but for now? I do nothing. Money is too tight to reach for plastic for a $12 discount.