You should never have to change the caliper.. Just b/c the brake pads go that doesnt mean the caliper is bad.. They are easy to inspect. Just back the piston back in with a c-clamp and then press or pump the brakes - if the piston comes back out and you dont see anything leaking than they are good to go.. My god, dont you woman keep a boyfriend any more that knows about cars??? I guess everybody go's to college nowadays