Disc Brake System: Service and Repair

BRAKE DISC MACHINING

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

Note
^ It is not necessary to machine new brake discs.

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

1. With the vehicle in NEUTRAL, position it on a hoist.
2. Position the brake caliper and brake caliper anchor bracket (if equipped) aside.

Note
^ It is not necessary to disconnect the brake line from the brake caliper.

3. Machine the brake disc using the on-vehicle brake lathe.
(1) Install the hub adapter and silencer belt, if necessary.
(2) Install the cutting lathe.
(3) 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 in), maximum is 0.08 mm (0.003 in).
(4) Center the cutting head, adjust the cutting bits, and install the chip deflector.
(5) Machine the brake disc.
(6) Remove the lathe and, if installed, the silencer belt.
(7) Remove the hub adapter.

Note
^ The depth of cut should be between 0.10 and 0.20 mm (0.004 and 0.008 in). Lighter cuts cause the bit to heat up and wear faster. Heavier cuts cause poor brake disc surface finish.

4. Remove any metal shavings.
5. Install the brake caliper and brake caliper anchor bracket (if equipped).

Note
^ It is not necessary to install new brake pads if the friction material properties are within specification.