Convert pedal effort into the hydraulic pressure that operates your brakes with the Dorman First Stop Brake Master Cylinder M631033. It is a direct-fit replacement for the 2013-2024 Mazda CX-5 with all engines. It is precision-engineered to match the original master cylinder's design, function and performance on that application, and it is made of new, high-quality materials for a safe, durable repair.
- Precise replacement: The aluminum cylinder housing is built to match the material of the original part for similar performance.
- Durable design: Every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: Made entirely from new materials for quality and safety.
- Strict specifications: Produced to meet rigorous SAE International standards.
Specifications: 0.813 in bore diameter · 2 outlets · M12 x 1.0 rearward outlet size · M12 x 1.0 secondary outlet thread diameter · 2 mounting holes · aluminum housing. Country of origin: China.
The package contains one master cylinder. The reservoir, cap, push rod, brake booster, sensor, bleeder hoses, mounting bracket and mounting hardware are not included. Transfer or replace components only as the vehicle service procedure directs, and consult the service information for the correct fasteners and whether they may be reused.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, brake fluid leaking at the cylinder, or a brake fluid level that keeps dropping. Diagnose the brake system before replacing parts; if the master cylinder is the cause, M631033 replaces it.
Interchange: 100-4109 · 130.45124 · 130.45125 · 355-80026 · 355-80027
1004109 · 13045124 · 13045125 · 35580026 · 35580027 · NM55651 · KDY34340ZA · KDY44340ZA · MC391551 · MC391552
This part cross-references / interchanges with the following part numbers:
100-4109, 130.45124, 130.45125, 355-80026, 355-80027, NM55651, KDY34340ZA, KDY44340ZA, MC391551, MC391552
Frequently Asked Questions
Will this master cylinder fit my 2013-2024 Mazda CX-5?
It is listed for the 2013-2024 Mazda CX-5 with all engines. Check the "Vehicles it fits" section to confirm your vehicle.
Does it come with a reservoir or cap?
No. The package contains one master cylinder only; the reservoir, cap, push rod, booster, sensor, bleeder hoses, mounting bracket and mounting hardware are not included.
What is the master cylinder made of?
The cylinder housing is aluminum. All rubber components are made of a high-quality EPDM compound that resists glycol-based brake fluid.
What are the outlet and bore specifications?
It has two outlets, a rearward outlet size of M12 x 1.0, a secondary outlet thread diameter of M12 x 1.0, a 0.813 in bore diameter and two mounting holes.
Does it need to be bled when installed?
Yes. A master cylinder is normally bench-bled before installation and the brake system bled afterward, following the vehicle service procedure; bleeder hoses are not included.
