Build firm, dependable brake-pedal pressure with the Dorman - First Stop Brake Master Cylinder M630913 — the hydraulic heart of the system that converts pedal force into the fluid pressure your brakes need. It installs as a direct-fit replacement for the listed applications: the 2012-2020 Chevrolet Sonic, 2013-2021 Buick Encore, and the 2014-2015 and 2018-2020 Chevrolet Trax (All engines).
- Cast iron housing: constructed to match the original part's casting material for similar performance.
- EPDM rubber components: the rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials, not remanufactured.
- Strict specifications: made to meet rigorous SAE International standards.
This unit has a 0.9375-inch bore and two outlets threaded M12 x 1.0, with a single-type reservoir design. The reservoir, fluid-level sensor, and mounting hardware are not included — transfer the originals or source replacements as directed by the vehicle service procedure. A pedal that slowly sinks under steady pressure, a spongy pedal, or brake-fluid leaks can be signs the master cylinder may need replacing; if a failed master cylinder is the cause, this replaces it. Country of origin: China.
Interchange: 174-1265 · 1741265 · 100-4031 · 1004031 · 10-4519 · 104519 · 130.62177 · 355-47122 · 35547122 · 95229905 · 95390404 · 95414483 · NM4287 · MC391548
Manufacturer part number M630913
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does a brake master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, pushing brake fluid through the lines to operate the brakes at each wheel.
Does the M630913 include a reservoir, sensor, or mounting hardware?
No. The reservoir, fluid-level sensor, and mounting hardware are not included; transfer the originals or source replacements as directed by the vehicle service procedure.
Which vehicles does this master cylinder fit?
It's listed for the 2012-2020 Chevrolet Sonic, 2013-2021 Buick Encore, and the 2014-2015 and 2018-2020 Chevrolet Trax. Check the Buyer's Guide tab to confirm your vehicle.
What is this master cylinder made of?
The cylinder housing is cast iron, built to match the original's casting material, and the rubber components use a high-quality EPDM compound that resists glycol-based brake fluid.
What are signs my master cylinder may need replacing?
A pedal that slowly sinks under steady pressure, a spongy pedal, or brake-fluid leaks can be signs. Diagnose the cause first, since other components can produce these symptoms.
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