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Tires Back to Training Center Glossary of aftermarket terms Abrasives: Substances used to wear away a surface by friction. Accessories: Comfort, convenience and safety products not essential to the performance of a vehicle, such as audio, security products, f More Training... Alternative Fuels Bodywork Brake & Front End Brake Systems Chassis Collision Customer Service Dealership Electrical Employment Engine Service Fuel Systems Heavy-Duty Truck HVAC Hybrid vehicles Ignition Safety Shop Supplies Tires Tools & Equipment Undercar Underhood