OEM Cadillac DTS Brake Disc

Cadillac DTS Brake Disc Parts and Q&A

• Rotor, Front
  23127614
  Q: How to replace the front brake disc (J55) on Cadillac DTS?

  A:

  You need to raise and hold the vehicle before taking out the tire and wheel set to replace the front Brake Disc j55. Secure the brake caliper with strong mechanic wire to shield the brake hose from damage when you thread out the brake caliper assembly. The Brake Disc's protective coating should stay intact and you need to check its surface only. Replace the disc if refinishing becomes essential. Note the disc attachment points to the hub before you take off the parts. Thoroughly clean the hub/axle flange with j-42450-a tool and Brake Disc surfaces with j-41013 tool. Use these tools only on non-friction areas to preserve the corrosion protective coating of the disc surface. Reassemble the Brake Disc to the hub/axle flange by aligning its matchmarks as you positioned them earlier. After putting the disc back into the brake system you need to measure its lateral runout with assembly components installed to see if it functions at its best. When the measurement exceeds specifications perform necessary adjustments. Attach the brake caliper and bracket components to the vehicle then reattach the tire and wheel assembly. Finish by opting the Brake Pads and discs at the end.
• Rotor, Front
  19303810
  Q: What Tools Are Required to Service and Repair the Brake Disc, and What Steps Should Be Followed to Ensure Proper Refinishing on Cadillac DTS?

  A:

  For brake disc service and repair, you need to have these tools: You will use the Disc Resurfacing Kit (J41013) and the Wheel Hub Resurfacing Kit (J42450-A). Make sure there is enough thickness on the disc above what is required by the minimum specification before you refinish it. Refinishing should only be done if the thickness is off by too much, there is heavy corrosion or pitting, you see cracks or heat spots, there is too much blueing discoloration, or the disc has excessive scoring. First, make sure to remove any rust or dirt from the hub/axle flange and brake disc surfaces by using the Wheel Hub Resurfacing Kit (J42450-A) and the Disc Resurfacing Kit (J41013). Look over the mating surfaces to remove any debris, and then fit the brake disc onto the brake lathe with clean attachments. Run the lathe and lower the cutting tools until they make contact with the disc's friction areas, making sure the witness mark looks right. Go ahead and re-mount if it's needed, then finish the disc using the lathe manufacturer's directions. After each pass on the lathe, look at the disc thickness and replace it if it fails to meet the required spec after finishing. To get the right finish, follow the speed recommendation, and use 120 grit aluminum oxide sandpaper with a non-directional tool if you have it, or 150 grit aluminum oxide sandpaper and a sanding block otherwise. Make sure to clean all friction surfaces well with denatured alcohol or an appropriate brake cleaner, then take the disc off the lathe to check the assembled lateral runout (LRO) for the best disc brake performance using a gauge, making changes if the LRO does not meet specifications.