Dorman - First Stop Brake Master Cylinder P/N:M630623
Turn brake-pedal effort into hydraulic pressure for your brakes with the Dorman First Stop Brake Master Cylinder M630932, a brand-new master cylinder built as a direct-fit replacement for the 2012-2019 Toyota Yaris. Dorman engineered it to replicate the original master cylinder's design, function and performance on the listed applications. It uses new, high-quality materials for a safe, durable replacement.
Specifications: The bore diameter is 0.812 in. It has two outlets: the secondary outlet thread is M12 x 1.0, and the primary outlet thread pitch is 1 mm. A single reservoir and a sensor are included. Mounting hardware is not included. The package contains one master cylinder. Country of origin: Taiwan.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, brake fluid leaking at the master cylinder, or a falling fluid level. These symptoms can have other causes, so diagnose the brake system before replacing parts. After installation, bleed the brakes as directed by the vehicle service procedure.
Interchange: 100-4104 · 130.44515 · 355-76096
NM55618 · MC391518 · 4720152620 · 1004104 · 13044515 · 35576096
This part cross-references / interchanges with the following part numbers:
Is this the right master cylinder for a 2012-2019 Toyota Yaris?
Yes. It is listed for the 2012-2019 Toyota Yaris with all engines. That application uses one master cylinder per vehicle.
Does it come with a reservoir?
Yes. The M630932 includes a single reservoir and a sensor. Mounting hardware is not included.
What is the housing made of?
The cylinder housing is cast iron. All rubber components use a high-quality EPDM compound designed to resist glycol-based brake fluid.
What are the bore and outlet specifications?
It has a 0.812 in. bore diameter and two outlets. The secondary outlet thread is M12 x 1.0, and the primary outlet thread pitch is 1 mm.
What are signs a master cylinder may need replacing?
Possible signs include a soft or sinking pedal, fluid leaking at the master cylinder, or a falling fluid level. These can have other causes, so diagnose the brake system first.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.