Aspen 4WD V8-5.7L Hybrid (2009)
Brake Rotor/Disc: Procedures
Brake Rotor Machining
DISC BRAKE ROTOR MACHINING
NOTE: A hub mounted on-vehicle lathe is highly recommended. This type of lathe trues the rotor to the vehicles hub/bearing.
The disc brake rotor can be machined if scored or worn. The on-vehicle lathe must machine both sides of the rotor simultaneously with dual cutter heads.
The rotor mounting surface must be clean before placing on the on-vehicle lathe. Equipment capable of machining only one side at a time may produce a
tapered rotor This type of rotor machining is not recommended.
NOTE: Proper wheel torque is also critical to help prevent any warping of the disc brake rotor.
CAUTION: Brake rotors that do not meet minimum thickness specifications before or after machining must be replaced.
Brake Drum in Hat Rotor Machining
BRAKE DRUM IN HAT ROTOR MACHINING
The brake drum in hat rotor can be machined on a drum lathe when necessary. Initial machining cuts should be limited to 0.12 - 0.20 mm (0.005 - 0.008
in.) at a time as heavier feed rates can produce taper and surface variation. Final finish cuts of 0.025 to 0.038 mm (0.001 to 0.0015 in.) are recommended
and will generally provide the best surface finish.
Be sure the drum in hat rotor is securely mounted in the lathe before machining operations. A damper strap should always be used around the drum to
reduce vibration and avoid chatter marks.
The maximum allowable diameter of the drum braking surface is stamped or cast into the drum in hat rotor.
CAUTION: Replace the drum in hat rotor if machining will cause the drum to exceed the maximum allowable diameter.
