GM Genuine Parts Clutch Master and Slave Cylinder Assemblies are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Clutch mater and slave cylinder assemblies are pressure tested to ensure safe and confident braking. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).