Dorman - First Stop Brake Master Cylinder P/N:M631033

Turn brake-pedal effort into the hydraulic pressure your brakes rely on with the Dorman - First Stop Brake Master Cylinder (M631033). It installs as a direct-fit replacement for the 2013-2024 Mazda CX-5 [All] and is precision-engineered to match the design, function, and performance of that vehicle's original master cylinder. The unit pressurizes brake fluid and sends it out through its two outlets to the brake circuits; if a worn or leaking original is the cause of a sinking or soft pedal, this master cylinder replaces it.

• 100% new: built entirely from new materials, not remanufactured.
• EPDM rubber components: made from a high-quality EPDM compound for resistance to glycol-based brake fluid.
• Aluminum housing: constructed to match the casting material of the original part for similar performance.
• SAE standards: made to meet rigorous SAE International specifications.

Key specs: aluminum master cylinder with a 0.813 in bore, two outlets, M12 x 1.0 rearward/secondary outlet threads, and two mounting holes. Supplied as one master cylinder only — no reservoir, cap, push rod, fluid-level sensor, bleeder hoses, brake booster, mounting bracket, or mounting hardware are included; consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.

Interchange: 100-4109 · 1004109 · 130.45124 · 130.45125 · 355-80026 · 35580026 · 355-80027 · 35580027 · NM55651 · KDY34340ZA · KDY44340ZA · Manufacturer part number M631033.