GM Genuine Parts Remanufactured ABS Modulator Valves are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These valves control the flow of brake fluid into your brakes, providing the critical anti-lock feature. Remanufacturing ABS Modulator Valves is an automotive industry practice that involves disassembly of existing units, and replacing components that are most prone to wear with new components. Damaged and obsolete parts are replaced and are end of line tested to ensure they perform to GM specifications. In addition, remanufacturing returns components back into service rather than processing as scrap or simply disposing of them.