OEM GMC Safari Brake Disc

GMC Safari Brake Disc Parts and Q&A

• Rotor
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  Q: How to replace the rear brake disc on GMC Safari?

  A:

  Vehicle elevation for support becomes necessary before starting the replacement process for the rear brake rotor. Mark the relationship between rotor and hub before removing the tire wheel combination. Hook a brake caliper support to the caliper to stop hydraulic damage through the hose while you remove its bracket mounting bolts. Remove the brake caliper assembly with the bracket while leaving the hydraulic hose connected and then unscrew the rotor retaining push nuts from wheel studs if such nuts exist. A deadblow hammer strike on the rotor end followed by turning motion and pulling direction away from the axle separates the hub from the rotor for removal. The installation process requires users to clean rust and foreign matter from the surface of rotor and flange by utilizing wheel hub resurfacing kit (J 42450-A) alongside rotor resurfacing kit (J 41013). First turn and gently push the rotor to the axle direction before reattaching the caliper and bracket assembly. You must remove the supply adhesive label before following these steps: wash the threads with brake parts cleaner and secure them by applying threadlocker gm p/n 12345493 (Canadian P/N 10953488) to the threads. Reinstall the tire and wheel assembly then lower the vehicle. Next apply the brake pedal slowly to two-thirds of pedal extend then release it gradually. Repeat this procedure until pedestrian resistance becomes strong. Complete the fluid level in the master cylinder reservoir with fresh brake fluid according to specifications.
• Hub Assembly, Front
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  Q: Under What Conditions Should Brake Discs Be Serviced and Repaired on GMC Safari?

  A:

  Refraining from brake rotor refinishing must happen when the braking surface shows intense damage exceeding 1.5 mm (0.060 inch) or when pulsation reveals rotor thickness exceeds 0.025 mm (0.001 inch) or corrosion extents beyond the surface. One must use accu turns as an off-vehicle brake lathe while pro-cut functions on the vehicle. The j39144 composite rotor mounting adapter and the resurfacing tools j41013 rotor and j42450-a wheel hub alongside the j39544-kit torque socket set and other required hardware make up all necessary equipment. The procedure starts with caliper support while you set markers to the rotor that help identify its spot on the hub. Degrease the mating surface of the rotor and flange with the j42450-a before measuring its minimal spot with the micrometer; a point less than the spec requires a new rotor instead of resurfacing. Dust down the rotor/hub mating surfaces along with rotor/wheel contact zones by using the j41013 device. Affix the brake rotor onto the brake lathe by utilizing j39144 tool for composite rotors or directly mount it onto the vehicle if using pro-cut while keeping it aligned with the existing marks. The lathe manufacturer's specifications must guide rotor refinishing steps because a perfect finish helps prevent stopping problems. When the machining process ends use 120 grit aluminum oxide sandpaper and non-directional rotor finishers to make the braking surfaces non-directional before cleaning them with denatured alcohol or suitable brake cleaner. After finishing the process replace the brake rotor by installing the caliper and validating the alignment throughout the installation. The proper procedure to protect brakes from damage requires using the j39544-kit torque socket or torque wrench to achieve uniform wheel nut tightening which reaches the recommended torque value.