Convert every press of the brake pedal into hydraulic braking pressure with the Dorman First Stop Brake Master Cylinder, part number M630918. This new master cylinder is a direct-fit replacement for many BMW models, among them the 2017-2019 BMW 230i. See the Buyer's Guide tab for the full list.
- Precise replacement: Engineered to mirror the original master cylinder's design, function and performance. The cylinder housing is constructed to match the casting material of the original part and is designed to deliver similar performance.
- Durable design: Every rubber component is made from a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: Built entirely from new, high-quality materials for a safe, durable replacement.
- Strict specifications: Made to meet rigorous SAE International standards.
Specifications: cast iron housing, 1 in bore diameter, two outlets, M12x1.0 rearward outlet size and M12x1.0 secondary outlet thread diameter. The package contains one master cylinder. The reservoir, sensor and mounting hardware are not included. Transfer or replace the reservoir as your vehicle's service procedure directs. Consult the service information for the correct fasteners and whether they may be reused. Country of origin: Taiwan.
Signs a master cylinder may need replacing include a soft brake pedal, a pedal that slowly sinks under steady pressure, or fluid seeping from the unit. Other brake components can cause similar symptoms, so diagnose the cause before replacing. Bleed the master cylinder and brake system as the service procedure directs.
Interchange: 100-4093 · 11-4694 · 130.34122
34336851095 · MC391505 · MC146080 · 1004093 · 114694 · 13034122
This part cross-references / interchanges with the following part numbers:
100-4093, 34336851095, 11-4694, 130.34122, MC391505, MC146080
