Relax the wheel bolts, lift the vehicle and keep the vehicle balanced using jackstands and then take off the wheel. Jack up the brake caliper and then remove the brake caliper but do not lose the brake hose, and hang it out of reach with a piece of wire being careful not to stretch or twist the hose. Install the wheel bolts back in to hold the disc in place in case necessary, with washers, which may be necessary, to fill the gaps. Examine the surface of the disk visually, looking at all score marks, cracks, etc.; light scratches and shallow grooves are ok, but deep score marks or cracks may require refinishing or replacement. Feel both sides of the disc and in case of pulsation when you are braking, then think of disc runout. To measure runout, an indicator of dial size, approximately 1/2-inch in diameter and mounted approximately 1/2-inch out of the outer rim, should be used, put in zero, and the disc turned; an indication of more than 0.003 inch can be checked by refinishing or replacement. In case of no necessity to have refinishing, the brake pad surface can be de-glazed by means of swirling movement on emery cloth or sandpaper. Make sure that the disc is not machined beneath the recommended minimum thickness which is usually cast or stamped into the disc and measure the thickness using a micrometer. To remove, remove the brake caliper and suspend and then the caliper mounting bracket. Unscrew the screw that holds the disc, and remove the disc, including any wheel bolts which there may be, with a mallet, should there be some. Wipe off all the rust or corrosion on the hub flange and inside the brake disc, and apply a small coat of anti-seize compound between the hub flange and the inside of the disc. Install the disc on the hub and screw the retaining screw on and then the brake caliper mounting bracket and bolts to the required torque. Then install the brake pads and the caliper tightening the bolts to a torque and then install the wheel and lowering the vehicle to the ground, tightening the wheel bolts. Press the brake pedal several times to contact the brake pads on the disc and verify brake functionality and the parking brake, then get back to normal functioning of the vehicle.