Brake Master Cylinder for 1993-2000 Nissan Altima & More - Dorman M390139

Turn every press of the pedal into hydraulic braking pressure with the Dorman brake master cylinder M390139 from the First Stop line. It is a direct-fit replacement for the 1993-2000 Nissan Altima and 1994-1996 Infiniti G20. Dorman precision-engineers this unit to mirror the original master cylinder's design, function and performance on the listed applications, and builds it from new, high-quality materials so it serves as a safe, durable replacement.

• Precise replacement: The cylinder housing is built to match the casting material of the original part, so it performs much like the unit it replaces.
• Durable design: Every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
• 100% new: It is made entirely from new materials, with quality and safety in mind.
• Strict specifications: It is built to meet rigorous SAE International standards.

The master cylinder converts force from the brake pedal into the hydraulic pressure that the rest of the brake system relies on. Signs that it may need replacing include a brake pedal that feels spongy or slowly sinks under steady pressure, fluid seeping around the unit, or a brake warning light tied to low fluid. These symptoms can have other causes, so diagnose the brake system before you replace parts. If a failed master cylinder is the cause, this unit replaces it. See the Buyer's Guide tab for full fitment details.