Service Procedure
SERVICE PROCEDUREBefore mounting the brake lathe on the vehicle ensure the following:
1. The V-way between the carriage and carriage gib must be clean and adjusted properly (see Operation Manual for adjustment procedure). Wipe off sliding surfaces with a soft cloth after each use.
2. The cutters and cutting bits must be tight in their mounts and positioned properly. Change cutting bits when they become dull.
3. When securing the adjustable mounting brackets to the caliper mount/knuckle the mounting surfaces must be smooth and free of burrs.
4. Make sure the adjustable mounting brackets are securely mounted to caliper mount/knuckle. There should be no movement between the cutting tool and the caliper mount/knuckle.
ROTOR DRIVING UNIT
Before using the drive unit ensure the following:
1. Before using the rotor driving unit ensure that all lug nuts are installed on the lugs (including the lugs not used for the lug adaptor). All lug nuts should be evenly torqued, to at least 40 ft/lbs. Do not over-tighten the lug nuts as damage may occur to the lug adaptor legs.
2. To prevent chatter and ensure a smooth rotor finish, install the largest and heaviest silencer band possible around the outside diameter of the rotor.
ROTOR CUTTING
Before engaging the cutting tool, ensure the following:
1. Using the dial indicator, measure rotor/hub run-out prior to resurfacing rotor and adjust cutting depth to eliminate this run-out. Each cut may be between 0.05 mm and 0.25 mm (0.002" and 0.010"). Additional cuts may be necessary to eliminate all the run-out.
2. Using a micrometer, measure rotor thickness in at least 8 even locations around the rotor. Do not cut below the minimum rotor thickness specification. Replace rotor if the run-out cannot be eliminated without exceeding the minimum rotor thickness specification.
3. After rotor resurfacing is completed, measure the rotor/hub run-out using a dial indicator. Ensure that the run-out is below the specification for the vehicle. If run-out is not within specifications, turn the rotors again. Properly machined rotors will have almost zero run-out (.001" or less) with no measurable thickness variation.
CAUTION: When using an on the car brake lathe, be sure to prevent metal shavings from contacting or collecting on the ABS wheel speed sensor. Remove any shavings that stick to the ABS wheel speed sensor's magnet.
NOTE: If the rotor must be removed for cleaning and/or other purposes after resurfacing with an on the car brake lathe is complete, mark its exact location on the axle prior to removal. Incorrect alignment during reinstallation will cause the run-out to change, possibly exceeding specifications. This could require the rotor to be turned again.
4. Do not smooth the rotor surface with sand paper or other abrasive material.