Raybestos CMA39931 Clutch Master Cylinder is a replacement hydraulic master cylinder for manual-clutch systems on select Geo Prizm models produced from 1990 to 1997. It features a 5/8-inch bore and interchanges with CMA39930 and CMA350000 in Raybestos catalogs, with cross-reference to Dorman CM39931 in common parts listings. This CMA-series part is designed for use in vehicles that rely on a hydraulic clutch to actuate the slave cylinder, restoring proper clutch operation on the affected model range.
