GM 19213925
Rotor, Front

Restoring the Brake Disc needs you to get both j 41013 rotor resurfacing kit (J 41013) and j 42450-a Wheel Hub resurfacing kit (J 42450-A). Everyday brake maintenance does not include refinishing disc brake discs and newly purchased discs enter the system without refinishing. Refinishing is appropriate when the disc is still thick enough and shows more than maximum permitted corrosion, cracks, or scratches. Prepare the hub/axle flange and Brake Disc surfaces with the j 42450-a to remove rust. Also use j 41013 to clean the mating surfaces. Mount the Brake Disc firmly onto the brake lathe surfaces first and make sure all contacts stay clean. When the tool hits the disc surface at lathe speed you can inspect the evidence mark to validate tool alignment. The lathe needs to be operated according to manufacturer's directions while testing the disc thickness at each cutting step. The disc must be replaced because it reached above the stated thickness limit during refurbishing. Follow the recommended speed mode to produce a non-directional finish by using 120 grit aluminum oxide sandpaper on equipment with built-in finishing tools or 150 grit sandpaper on a sanding block when needed. Clean friction surfaces with denatured alcohol or brake cleaner before measuring assembly lro to make sure disc brakes perform at top level. Adjustments are needed when the lro reading goes beyond allowed limits.

You need the rotating and wheel hub resurfacing kits to work on brake discs. The tools are J 41013 and J 42450-A. Disc brake discs only need touch-up when they show signs of major corrosion, holes, cracks, hot spots, extreme discoloration from heat, surface faults more severe than permitted limits, or when thickness changes surpass the maximum standards. Check the disc thickness and surface for finishability while making sure the parts stay above their minimum thickness standards. Remove wheel bearing and brake disc surface corrosion with J 41013 Rotor Resurfacing Kit on the wheel bearing flange and J 42450-A Wheel Hub Resurfacing Kit on brake disc mounting surfaces. Set the brake disc on the lathe system following producer guidelines and confirm all installation parts are spotless. Adjust the cutting tools to touch the disc while the lathe runs by watching the witness marks to verify correct mounting. Remount the disc whenever the witness mark fails to cover three-quarters of its circumference. Use the lathe according to the manufacturer's guidelines while checking disc thickness after each refinement phase. The disc needs to be replaced when its thickness surpasses the set limits. For non-directional finishing use the recommended speed while sanding with 120 grit aluminum oxide sandpaper on non-directional tools or a sanding block paired with 150 grit sandpaper. Wipe the brake friction areas thoroughly using denatured alcohol or brake cleaner before taking the disc away from the lathe.

Remove the caliper bracket bolts without disconnecting the brake flexible hose bolt, and take out the brake caliper and caliper mounting bracket as an assembly from the suspension knuckle.

Install the brake rotor.

Install the new brake rotor.

Reinstall the caliper bracket.

Clean any rust or contaminants using the Wheel Hub Resurfacing Kit (J 42450-A) and the Rotor Resurfacing Kit (J 41013).