Raybestos MC390418 Brake Master Cylinder PG Plus

Raybestos MC390418 PG Plus Professional Grade Brake Master Cylinder is a new, 1.000-inch bore aluminum master cylinder designed as an OE replacement for compatible vehicles. This PG Plus unit includes a reservoir and uses a two-bolt mounting pattern with 0.358-inch mounting holes, offering straightforward installation in place of the factory part. The housing measures approximately 8.13 inches long, 5.88 inches high, and 5.88 inches wide, and it weighs about 1.97 pounds. The primary hydraulic port uses an M10x1 thread, supporting a single primary port configuration in the body. The MC390418 is listed under Raybestos catalogs for Acura applications such as the 2003 CL Type-S and 2003 TL Type-S, reflecting its intended OE-replacement role in those late-model chassis. As a professional-grade replacement, it aims to restore proper brake pedal feel and hydraulic efficiency when the original master cylinder has worn or failed, making it a suitable choice for repair shops and skilled DIYers seeking reliable performance without modifying the braking system.