Disc Brake System: Testing and Inspection

Brake Disc Machining

Caution:
^ Do not use a bench lathe to machine brake discs.

Note:
^ Read the entire operating manual and view the video shipped with the lathe before installing, operating, or repairing the lathe.

Note:
^ Do not machine new brake discs.

Note:
^ Lateral runout and disc thickness variation measurements are not required because correct adjustment of the on-vehicle brake lathe will make sure that these dimensions are within specifications.

Note:
^ It is not necessary to disconnect the brake jounce hose from the brake caliper.

1. Position the brake caliper and brake caliper anchor bracket (if equipped) aside.
2. Machine the brake disc using an on-car brake lathe. Install the hub adapter and silencer belt, if necessary.
^ Install the cutting lathe.
^ If the lathe is not self adjusting, adjust the lathe oscillation using a dial indicator. Total indicated reading (TIR) target is 0.000 mm (0.000 inch), maximum is 0.08 mm (0.003 inch).
^ Center the cutting head, adjust the cutting bits, and install the chip deflector.

Note:
^ The depth of cut should be between 0.10 and 0.20 mm (0.004 and 0.008 inch). Lighter cuts will cause the bit to heat up and wear faster. Heavier cuts will cause poor brake disc surface finish.
^ Machine the brake disc.
^ Remove the lathe and, if installed, the silencer belt.
^ Remove the hub adapter.
3. Remove metal shavings.

Note:
^ It is not required to install new brake pads if friction material properties are within guidelines.

4. Install the brake caliper and brake caliper anchor bracket (if equipped).