OEM Chevrolet Astro Brake Disc

Chevrolet Astro Brake Disc Parts and Q&A

• Rotor
  19211496
  Q: How to replace the front brake disc on Chevrolet Astro?

  A:

  To change the front brake rotor, collect tools needed: rotor resurfacing kit (J 41013) and wheel hub resurfacing kit (J 42450-A). Start by lifting and holding the vehicle, then take off the tire and wheel assembly. Mark the position of the rotor in relation to the hub and then unbolt the two Brake Caliper Bracket mounting bolts. Support the brake caliper with heavy mechanic's wire so as not to damage the hydraulic flexible brake hose. Take the brake caliper and the mounting bracket into an assembly, allowing the hydraulic brake flexible hose to remain connected. Remove the rotor retaining push nuts from the wheel studs if required. In order to separate rotor from hub, where needed, use a deadblow hammer for; after that, remove the rotor. Remove rust or foreign matter from the mating surface of the rotor and flange using the wheel hub resurfacing kit j 42450-a, and rotor resurfacing kit (J 41013). Make sure the hub flange is free from nicks or marks by the time the rotor is mounted. Mount the rotor onto its original position on the hub and install followed by the caliper together with the caliper mounting bracket assembly. Prior to installing the caliper bracket mounting bolts, clean all the threads down with break parts cleaner, remove all traces of da of the original adhesive patch, and apply threadlocker (GM P/N 12345493). Mount the two caliper bracket mounting bolts and tighten it to 175 nm planning for 121 ft. Lbs. Reinstall the tire and wheel assembly, set the vehicle back down, and with the engine off, slowly press the brake pedal to about 2/3 of its stroke distance and then slightly release. Never release the pedal until a firm pedal is obtained which ensures appropriate seating of the brake caliper pistons and brake pads for15 seconds repeat this process. Finally, pour the brake fluid up to the proper elevation into the master cylinder reservoir for the following brake fluid.
• Rotor, Front
  19210603
  Q: What Tools Are Required to Service and Repair the Brake Disc, and When Is Refinishing Warranted on Chevrolet Astro?

  A:

  The brake disc service needs these tools: Rotor Resurfacing Kit (J 41013) plus Wheel Hub Resurfacing Kit (J 42450-A). During typical brake system duties the disc brake discs keep their factory finish and new disc brake discs also do not need refinishing work. Regrooving should not solve brake system problems that include brake noise, unbalanced pad wear patterns, light surface corrosion, and less-than-maximum score depth when the disc has enough materials left. Refinishing process is needed only when the disc brake discs show excessive uneven thickness, rust, small holes, cracks, hot spots, extreme discoloration, or deep scores that exceed the accepted specifications. Use the Wheel Hub Resurfacing Kit (J 42450-A) and the Rotor Resurfacing Kit (J 41013) to clean rust and impurities before beginning disc and hub surface refinement. Look for foreign items on brake mating surfaces while you set the brake disc in place on the brake lathe. Check all equipment parts for cleanliness. As the lathe turns follow the cutting tool movement until it touches disc surfaces while looking for the knife mark to verify correct positioning. Guide the lathe manufacturer's steps to refinish the disc while tracking its thickness until the minimum limit is met and replace it when reached. Keep the finish even by using the recommended lathe speeds combined with non-directional tools and aluminum oxide sandpaper that is 120 grit or a sanding block with 150 grit sandpaper. After cleaning the brake surfaces use denatured alcohol or brake cleaner to take the disc off the lathe. Measure assembled LRO to improve disc brake performance and make adjustments if required.