Genuine Audi 100 Brake Disc

Audi 100 Brake Disc Parts and Q&A

• Rotor
  4A0-615-301-D
  Q: What should you be aware of before starting work on rear brake disc renewal and How to properly replace them on Audi 100?

  A:

  Before starting work, be aware of the dangers of asbestos dust. If either brake disc requires renewal, both should be replaced simultaneously to ensure even and consistent braking, along with new brake pads. Firmly chock the front wheels, jack up the rear of the car, and support it on axle stands. Remove the appropriate rear roadwheel and refit one of the wheel nuts to keep the brake disc correctly positioned on the hub, using spacers if necessary to clamp the disc firmly. Inspect the disc, then slacken and remove the bolts securing the caliper mounting bracket to the rear axle. Slide the caliper assembly off the disc and tie it to the coil spring to avoid straining the hydraulic Brake Hose. Mark the relationship of the disc to the hub with chalk or paint, then remove all wheel bolts and take off the disc, lightly tapping its rear face with a mallet if it is tight. Refitting is the reverse of removal, ensuring the mating surfaces of the disc and hub are clean and flat, aligning any marks made during removal, and wiping any preservative coating from a new disc before fitting the caliper. Clean the caliper bracket mounting bolts, slide the caliper into position ensuring the pads pass either side of the disc, and tighten the caliper bracket bolts to the specified torque. Check and adjust the handbrake if necessary, then refit the roadwheel, lower the vehicle, and tighten the roadwheel bolts to the specified torque.
• Brake Rotor
  443-615-301-B
  Q: What should you be aware of before starting work on front brake disc renewal on Audi 100?

  A:

  Before starting work, be aware of the dangers of asbestos dust. If either brake disc requires renewal, both should be replaced simultaneously to ensure even and consistent braking, and new brake pads should also be fitted. Begin by applying the handbrake, jacking up the front of the car, and supporting it on axle stands. Remove the appropriate front roadwheel, ensuring at least one wheel bolt is refitted to keep the brake disc correctly positioned on the hub, using spacers if necessary. Rotate the brake disc slowly to check both sides; remove the brake pads for better access if needed. Light scoring is normal, but heavy scoring or cracks indicate the disc must be renewed. A rust and brake dust lip around the disc's perimeter can be scraped off, but if excessive wear has formed a lip, measure the disc's thickness with a micrometer at several points; if it is at or below the specified minimum thickness, renewal is necessary. To check for warping, secure the disc to the hub with at least two roadwheel bolts and measure run-out using a dial gauge or feeler blades; if measurements exceed the specified maximum, the disc is excessively warped and must be renewed, but first ensure the hub bearing is in good condition. Inspect the disc for cracks, especially around the wheel bolt holes, and renew if necessary. To remove the disc, loosen and remove the two bolts securing the Brake Caliper mounting bracket, slide the caliper assembly off the disc, and tie it to the front coil spring to avoid straining the hydraulic Brake Hose. Mark the relationship of the disc to the hub, remove the wheel bolts, and take off the disc, tapping lightly if it is tight. Refitting is the reverse of removal, ensuring the mating surfaces are clean and flat, aligning any marks made during removal, wiping any preservative from a new disc, cleaning the caliper bracket mounting bolts, sliding the caliper into position with the pads on either side of the disc, tightening the caliper bracket bolts to the specified torque, refitting the roadwheel, lowering the vehicle, and tightening the wheel bolts to the specified torque. Finally, apply the footbrake several times to ensure the pads contact the disc before driving.