IdentificationAccessory and warranty replacement must use TPC spectires.An outboard orientation stripe is added to the tread surface,with an offset toward the outboard tire face.All GM approved tires (Production, Service and Accessory)have a TPC (Tire Performance Criteria) code.A replacement tire that lacks the original TPC code will notmeet the performance characteristics of the original tire, even ifit is the same brand, model and size.Force and MomentResidual Aligning Torque (RAT)Rolling ResistanceBraking TractionDriving TractionUniformityNoiseDimensionsMassRev/KMHigh SpeedAir RetentionElectrical ResistanceAutomatic MountingEndurance (ATE)TreadwearChip/tearGroove WanderRide and HandlingWet/Snow Handling
The TPC system facilitates tire replacement for GM customerson GM vehicle, meeting the same critical performance specificationsof GM vehicle original equipment tires.
Parking Brake Adjustment Parking Brake
Special ToolsJ-21177-ADrum-to-Brake Shoe Clearance GaugeWarning:Refer toBrake Dust Warning.Apply and fully release the park brake.Verify that the park brake pedal releases completely.Turn ON the ignition. Verify the BRAKE indicator lamp isoff.If the BRAKE indicator lamp is on, ensure the park brakep ...