Dorman M630931 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota Yaris

The Dorman M630931 brake master cylinder is engineered to restore proper brake hydraulics in your Toyota Yaris. Designed with durable cast iron and equipped with a removable reservoir, this master cylinder ensures consistent brake fluid management and reliable stopping power.

• Master cylinder bore diameter: 0.8125 inches for precise hydraulic pressure
• Constructed from cast iron for long-lasting durability
• Includes a removable reservoir for easy maintenance
• Equipped with a sensor to monitor brake fluid levels
• Two outlets with M12 x 1.0 thread size for secure brake line connections

Product Details and Specifications

The Dorman M630931 brake master cylinder features a cast iron body that withstands the rigors of brake system pressure and heat. Its 0.8125-inch bore diameter is designed to match the hydraulic requirements of the Toyota Yaris brake system. The included removable reservoir simplifies brake fluid inspection and replacement, while the integrated sensor provides real-time monitoring of fluid levels to help maintain safe braking performance. This master cylinder has two outlets, both with M12 x 1.0 thread pitch, ensuring compatibility with the vehicle’s brake lines. Note that mounting hardware is not included with this part.

Compatible Vehicles and Applications

• Compatible with Toyota Yaris models requiring a 0.8125-inch bore diameter master cylinder
• Ideal replacement for brake hydraulic system repairs and maintenance
• Addresses issues such as brake fluid leaks, spongy brake pedal, and loss of hydraulic pressure

Installation Notes and Tips

• Ensure brake fluid system is properly bled after installation to remove air pockets
• Verify thread pitch and outlet sizes match existing brake lines (M12 x 1.0)
• Inspect reservoir and sensor connections for secure fitment
• Use appropriate brake fluid as specified by Toyota for the Yaris

Quality Assurance and Warranty

Dorman manufactures the M630931 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and integrated sensor contribute to reliable brake system performance. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in material and workmanship.