There are models fitted with cross-drilled brake discs, which have holes to assist in cooling whilst braking excessively. Such discs cannot be refinished on regular brake lathes, and thus, when a cross-drilled disc is out of shape or faulty, replacement is frequently the most feasible. In order to inspect, loosen the wheel-bolts, rise the vehicle and place it safely on jackstands before removing the wheel. The caliper brake can be dismounted without detaching the brake hose; once the bolts of caliper have been loosened, hang it up by hanging a piece of wire, but not to stretch out or twist the hose. Install the wheel bolts to hold the disc against the hub should it be necessary with some spacing with washers. Look physically at the disc surface area and ensure that light scratches are normal; however, deep scars or cracks can be the cause of a refinishing or replacement. Hairline cracks of 10 mm or below are acceptable on cross drilled discs. In case of pulsation during braking, suspect disc run out. A dial indicator spaced approximately 1/2 inch off the outside can be used to measure runout; a value of more than 0.003 inch can be others to refinish or replace. In case refinishing is not necessary, deglaze the braking pad surface using emery cloth or sandpaper in swirling motion. Make sure that the disc is not machined less than the given minimum of the disc, which is usually cast and carved into the disc. Thickness of cell with a micrometer. To remove and install, suspend the brake caliper with wire, then remove the caliper mounting bracket then the disc retaining screw and any wheel bolts. Wipe the hub flange and inside of the brake disc completely to eliminate rust or corrosion and place a thin layer of anti-seize agent to eliminate future problems. Attach the disc to the hub, screw the retaining screw and replace brake caliper mounting bracket and brake pads, and make sure that all the screws are tightened to a required torque. And lastly fit the wheel, drop the vehicle, and fix the wheel bolts and then push the brake pedal to rub the pads with the disc, verifying the brakes and parking brake functionality, and then restore the vehicle to normal usage.