Note: Brake discs do not require resurfacing as part of normal brake system maintenance. Do not resurface brake discs to correct the following defects:
- Extraneous noises in the brake mechanisms.
- Uneven and/or increased wear of brake pads.
- Surface or cosmetic corrosion/rust of the working surfaces of the brake disc.
- Brake disc wear exceeds the permissible value.
Before regrinding the brake disc, you must first check its thickness to make sure that it is not less than the permissible value. The brake disc is subject to regrinding if its thickness is greater than the maximum permissible value and the following conditions occur:
- Excessive corrosion/rust and/or pitting.
- Cracks and/or hot spots.
- Rainbow spots from overheating.
- Uneven wear of the brake disc surface.
In addition, regrinding of the brake disc is permitted as part of the process of correcting the axial runout of the brake disc that exceeds the maximum permissible value.
After each removal of the brake disc from the wheel hub flange, it is necessary to remove rust or foreign materials from the contact surfaces of the disc and flange using the cleaning kit SN 42450. Failure to comply with this condition may cause increased runout of the brake disc and brake pulsation.
1. Carefully remove rust from the contact surfaces of the wheel hub and brake disc.
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2. Check the contact surfaces of the wheel hub flange and brake disc to ensure that there are no foreign particles or contaminants.
3. Install the brake disc on the lathe according to the lathe manufacturer's instructions, ensuring that all fittings and adapters are free of contamination.
4. Ensure that all torsional dampers are in place.
5. With the machine turned on, slowly move the cutting tool until it contacts the working surface of the brake disc.
6. Observe the mark left by the cutting tool. If the mark overlaps at least three-quarters of the circumference of the brake disc, the disc is installed correctly.
7. If the mark left by the cutting tool overlaps less than three-quarters, reinstall the brake disc in the machine.
8. Following the machine manufacturer's instructions, regrind the brake disc.
9. If after processing the disk its thickness is less than the maximum permissible, the brake disk must be replaced with a new one. It is necessary to check the thickness of the brake disk after each boring pass.
10. After regrinding the brake disc, perform the following procedure to obtain the required non-directional finish:
- Observe the machining speed recommended by the machine manufacturer.
- Use moderate pressure when performing final sanding: If the lathe has a final sanding function, use #120 aluminum oxide sandpaper; if your lathe is not equipped with a final sanding function, use #150 aluminum oxide sandpaper.
- After final sanding, clean the working surface of the brake disc with denatured alcohol or equivalent cleaning agent.
11. Remove the brake disc from the machine.
12. Measure the axial runout of the installed brake disc. If the obtained value exceeds the specification, regrind or replace the brake disc.
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