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ROTOR DIAGNOSIS AND TESTING BRAKE ROTOR Any servicing of the rotor requires extreme care to maintain the rotor within service tolerances to ensure proper Excessive runout or wobble in a rotor can increase pedal travel due to piston knock-back. This increases guide pin When diagnosing a brake noise or pulsation, the machined disc braking surface should be inspected. BRAKING SURFACE INSPECTION Light braking surface scoring and wear is acceptable. If heavy scoring or warping is evident, the rotor must be Excessive wear and scoring of the rotor can cause improper lining contact on the rotor’s braking surface. If the If a vehicle has not been driven for a period of time, the rotor’s braking surface will rust in the areas not covered by Some discoloration or wear of the rotor surface is normal and does not require resurfacing when linings are ROTOR MINIMUM THICKNESS Measure rotor thickness (1) at the center of the brake 5 - 126 BRAKES - BASE LX |