Jack the wheels off the ground and have someone step on the brakes and make sure all wheels do not turn by hand; if any turn, this could mean that a caliper is seized and not applying, which would cause the other side to wear more and could possibly cause a pull to one side when braking. If all's good, have the person release the brakes and make sure all of the wheels turn freely. If any require excessive effort to move or will not move, then this is a sign that a caliper is not releasing. This could be caused by a seized or sticking caliper, or due to a brake hose that has collapsed internally and is not allowing the fluid to return to the master cylinder. This can be checked by cracking open the bleeder on the incident caliper to see if the caliper releases the rotor, which would indicate a bad hose. If it still won't turn, the caliper is bad. I prefer to install a new hose when replacing a caliper, regardless. When you remove the caliper from the caliper mount, you can check the slide pins to make sure they slide freely.