Use the parking brake, loosen the wheel lug bolts, and lift the front of the car and firmly hold it with jack stands. To do a complete check, take off the front wheels, and, the brake pads, to do a deeper inspection of the caliper, they should be removed and cleaned. Measuring Thickness of the brake pads (including the backing plate of the steels) through the aperture in the caliper body. When one of the pads is burned off to the set thickness, or smaller, all the four must be changed as a set. Lastly, attach the lug bolts and wheels and lower the vehicle, and tighten the lug bolts to the required torque.