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Diagnosis and repair



Each time the brakes are serviced, the disc brake rotor should be checked for scoring, runout, parallelism and thickness.

ROTOR MACHINING

Do not machine, cut or true up new front disc brake hub and rotors prior to installation on vehicle. Making a light cut on a new front disc brake hub and rotor may cause excessive runout and result in brake shudder several thousand miles later. It is best to clean oil film off new front disc brake hub and rotor with Brake Cleaner or equivalent install it on vehicle.

Never use a brake lathe that cuts only one face of the front disc brake hub and rotor at a time. It must be a simultaneous straddle cut. All front disc brake hub and rotor refinishing must adhere to the rule that equal amounts of front disc brake hub and rotor stock are removed from each braking surface each time a front disc brake hub and rotor is refinished.

On-vehicle brake lathes, machine the front disc brake hub and rotor while it is on the hub and is turning on the same axis as the hub. This procedure reduces front disc brake hub and rotor lateral runout to near zero by cutting the front disc brake hub and rotor perpendicular to the axis of the hub, therefore cancelling the affect of stacked tolerance of the front disc brake hub and rotor and front wheel spindle. Follow the on-vehicle brake lathe manufacturers instructions on machining procedures.

A bench-mounted disc brake lathe machines the disc brake hub and rotor to the axis of the lathe arbor and will not reduce total lateral runout associated with stacked tolerances of the front disc brake hub and rotor and front wheel spindle. Follow manufacturers instructions on machining procedures.

With both types of brake lathes, set cutting tool to just contact the high spots on the front disc brake hub and rotor then adjust cutting tool to the minimum depth required to clean up the front disc brake hub and rotor face. The total material removed (combination of both sides) must not exceed the minimum discard thickness that is marked on the inside of the front disc brake hub and rotor.

To improve initial brake pedal feel and surface finish on a machined front disc brake hub and rotor, lightly sand rotor surface with 120 grit paper prior to road testing.




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