Genuine Mercedes-Benz 300TD Brake Disc

Mercedes-Benz 300TD Brake Disc Parts and Q&A

• Brake Rotor
  115-421-13-12-64
  Q: How to inspect, remove, and install front and rear brake discs on Mercedes-Benz 300TD?

  A:

  In order to check the vehicle, it would be necessary to place it on the jackstands and put it up to have it stable, and then remove the wheel and tire. Unscrew the Brake Caliper assembly and suspend it off the work with a piece of wire, but not by the Brake Hose, which is easily damaged. Examine the brake disc surfaces, and have found some light scoring or grooving, and this is normal, however deep grooves or gross erosion are unacceptable. Should pulsating be detected when braking, then assume disc runout. Connect dial indicator to caliper mounting bracket and brake disc should be turned and runout should be read on inboard and outboard surfaces, adopted precautions is that in case the runout is greater than maximum allowable the brake disc has to be removed and refinished. Measure brake disc thickness using a micrometer, should be less than minimum requirement, should replace with a new one; check the disc thickness at various points, variation more than 0.0005-inch will lead to the development of pulsating in the pedals, and above all, check that the disc thickness is within the accepted range, then the brake disc can be reshaped. To remove, first remove the front brake disc, by removing the hub and then unbolstering the brake disc with an Allen head wrench, which may be clamped to a vise and penetrant oil applied to the bolts to be removed. Rear brake disc may be pulled off the hub, having first unscrewed the caliper; and in case it is not easily removed, push the parking brake shoes awayward of the inbuilt drum in the brake disc. New brake discs have some protective coating which can be sprayed off using carburetor cleaner and a rag. Installation is in the opposite sequence of removal so that the front brake disc bolts are tightened to the recommended torque and that the rear hub flange is lightly lubricated with moly-base grease before the brake disc is installed with special attention paid to getting the locating pin to snap securely into the hole.