car pulls to the right when braking

I've had my 74 custom for a little over a year. When we put new tires on it, the front right tire was worn worse than the the front left tire. The car pulls to the right when the brakes are pushed. We took the tire off of the left, and pushed the brakes while it was running. The caliper does work. Does anyone have any ideas what could be causing this to happen? Thank you all in advance!