OEM GMC Sierra 3500 Brake Disc

GMC Sierra 3500 Brake Disc Parts and Q&A

• Brake Rotor
  25757802
  Q: What Tools Are Required to Service and Repair the Brake Disc, and What Are the Key Considerations for Refinishing on GMC Sierra 3500?

  A:

  Two basic kits are needed for disc and wheel hub services - Disc Resurfacing Kit (J41013) and Wheel Hub Resurfacing Kit (J42450-A). Regular brake service does not include disc refinement and new discs should not get refinished for brake system noise or other small issues. The technician needs to measure the disc thickness to confirm it remains above the lowest permitted limit before any refinishing happens. You need to refinish the discs only when the material buildup, rust, cracks, color changes, or depth marks exceed approved tolerances. You must prepare the hub/axle flange and brake disc mating surfaces for resurfacing by removing all rust and debris using Wheel Hub Resurfacing Kit (J42450-A) and Disc Resurfacing Kit (J41013). Place the brake disc on the brake lathe while checking for any dirt or contamination on its mating surfaces. Put the cutting tools to work on the rotating disc surface during lathe operation to create a witness mark; replace the disc if the mark reaches less than three-fourths of its circumference. Use the lathe manufacturer's procedure to restore the disc surface while checking thickness at each stage. The damaged disc must be replaced when its minimum thickness limit is reached. For a non-directional disc surface you should set your tool to the recommended speed and work with 120 grit aluminum oxide sandpaper when using a non-directional finishing tool or 150 grit sandpaper when using a sanding block. Wipe denatured alcohol or brake cleaner on friction surfaces then measure assembled LRO to ready disc brakes for service by correcting any necessary runout values.
• Rotor
  15712803
  Q: What Tools Are Required to Replace the Front Brake Disc on 2500 - 3500 Series on GMC Sierra 3500?

  A:

  The installation of front brake rotors for 2500 - 3500 series trucks needs both rotor resurfacing kit (J41013) and wheel hub resurfacing kit (J42450-A). Start the process by wiping off protective coverings from new rotors using denatured alcohol on their friction zones. Maintain the surface in a neat state. Start by removing the tire and wheel component followed by detached front wheel hub extension on dual-wheel automobiles. Prevent the rotor from rotating with a drift or large screwdriver before marking down the hub extension-hub matching positions. Tilt and remove the hub extension nuts and extension assembly by using a rubber mallet for proper extension removal. Inspect the brake master cylinder reservoir fluid until reaching the midway point then drain any fluid above this level. Establish the hub-extension-to-hub alignment by marking the rotor surface then apply force to the caliper pistons with two c-clamps. After separating the hydraulic brake hose keep the caliper bracket with the caliper as one assembly piece. Separate the rotor from the hub by removing brake rotor retaining push nuts then using a deadblow hammer. Clean the surfaces and apply penetrating oil followed by installation of two m10 x 1.5 bolts as force to separate the rotor from the hub. The wheel hub resurfacing kit (J42450-A) with rotor resurfacing kit (J41013) must be used by technicians to clean all rust and contaminants from both hub/axle flange and rotor mating surfaces before installation. Align the rotor before installing the hub flange when it has no nicks or marks. Measure the lro for the assembled setup and carry out adjustments when needed. Professional mechanics should clean caliper bolt threads before refitting the caliper parts using threadlocker gm p/n 12345493 (Canadian P/N 10953488) then secure the caliper bracket bolts at 300 nm (221 ft. Lbs). Reinstall front wheel hub extensions of dual wheel vehicles by positioning them just like their original placement and tightening their nuts to 130 nm (96 ft. Lbs.). Finish the process by reinstalling the tire along with the wheel assembly while you should slowly apply pressure to the brake pedal to position the caliper pistons and pads. Complete the installation by filling the fluid reservoir with new brake fluid if necessary.