Brakes, take off rear wheel, before you take off the pads, push the piston back in. I would also losen the bleeder screw before pushing the piston in (some do, some don't, I do). Install the new pads, put all back together. Double check the brake fluid level. Note: try not to losen the bleeder screw to much, just enough to relieve the pressure from pushing in the piston. P.S. is the rotor in good shape? Did it get down to metal on metal? If so it may have gotten hot. What color is the brake fluid? bjawes