Rotor Replacement and Off-Car Brake Lathe Procedure

4) Rotor Replacement And Off-Car Brake Lathe Procedures

If an on-car brake lathe is not available at your dealership, it may be necessary to use an off-car lathe or replace rotors. In order to ensure proper brake vibration and pulsation repairs, pay close attention to the following precautions:

A. Off-Car Brake Lathe Precautions

- Perform routine maintenance of brake lathe components (clearance of arbor shaft to adapters may need to be repaired).

- Clean all adapters and shaft to maintain accuracy of equipment.

- When installing rotor to machine, clean mud, rust, and/or foreign material from the adapters and rotors.

- After installing rotor on machine, check rotor run-out using dial indicator. If run-out is excessive, determine the cause and correct it.

- Follow lathe manufacturer repair procedures. Do not cut excessive amounts off rotor during the first cut to save time.

NOTE: Anytime a rotor is machined it must be measured for minimum rotor thickness. The thickness for the rotor is never to be less than minimum thickness as specified in the appropriate repair manual.

B. Installation of Rotor

- Check wheel bearing pre-load. If excessive movement is found, adjust bearing pre-load.

Figure 5:

- Using a dial indicator, measure the rotor 10 mm from the outside edge (see Figure 5).

C. Phase Match Rotor To Hub

Figure 6:

- If rotor run-out is at the maximum value or greater, (refer to appropriate repair manual) index the rotor one lug and measure the run-out again. Repeat this process, moving the rotor one lug each time, until the position is found where the run-out is at the minimum and within the maximum value listed in the appropriate repair manual (see Figure 6).

Figure 7:

- Tighten lug nuts to the specified torque following a star sequence when installing wheel (see Figure 7).

NOTE: DO NOT USE AIR IMPACT WRENCH