Motorcar Parts of America, Inc. manufactures, remanufactures, and distributes heavy-duty truck, industrial, marine, and agricultural application replacement parts in the United States. It operates through three segments: Hard Parts, Test Solutions and Diagnostic Equipment, and Heavy Duty. The company offers light duty rotating electrical products, including alternators and starters; wheel hub assemblies and bearings; brake-related products comprising brake calipers, brake boosters, brake rotors, brake pads, and brake master cylinders; and turbochargers.