Dorman - First Stop Brake Master Cylinder P/N:M39646

Turn brake-pedal effort into controlled hydraulic pressure with the Dorman - First Stop Brake Master Cylinder M39646. Engineered to reproduce the original master cylinder's design, function, and performance, it drops in as a direct-fit replacement across the listed applications, including the 1992-1994 Chevrolet Blazer, 1988-1993 Chevrolet C1500, 1988-1994 Chevrolet C2500, 1994 Dodge Ram 1500, and 1992-1994 GMC Yukon — see the Buyer's Guide tab for the full list.

• 100% new: built entirely from new materials, not remanufactured.
• Durable design: rubber components use a high-quality EPDM compound that resists glycol-based brake fluid.
• Precise replacement: the aluminum cylinder housing is constructed to match the casting material of the original part for similar performance.
• Built to spec: made to meet rigorous SAE International standards.

This dual-outlet master cylinder ships with the reservoir included and uses a 1/2-20 rearward outlet size. A fluid-level sensor and mounting hardware are not included, so reuse or source those as directed by the vehicle service procedure. Country of origin: China. Manufacturer part number M39646.

Signs the original master cylinder may need replacing include a brake pedal that slowly sinks under steady pressure, a spongy pedal, or unexplained brake-fluid loss. Diagnose the cause first, and if a failed master cylinder is the culprit, this unit replaces it.