Dorman M630770 Brake Master Cylinder

Reliable Brake Master Cylinder for BMW 128i

The Dorman M630770 brake master cylinder is engineered to restore proper brake hydraulics in your BMW 128i. Crafted from durable aluminum, this master cylinder offers precise bore dimensions and reliable performance for your vehicle's braking system.

• Compatible with BMW 128i models
• Master cylinder bore diameter: 0.938 inches
• Constructed from high-quality aluminum material
• Includes two outlets with M12 x 1.0 thread size
• Does not include reservoir or mounting hardware

Product Details and Specifications

The Dorman M630770 brake master cylinder features a 0.938-inch bore diameter, designed to meet the exact specifications required for BMW 128i brake hydraulics. Manufactured from aluminum, this part ensures corrosion resistance and long-lasting durability under demanding conditions. It includes two outlets, both with M12 x 1.0 thread pitch, allowing for secure and precise brake line connections. Note that this master cylinder does not come with a reservoir or mounting hardware, so these components must be sourced separately if needed.

Applications and Common Issues Addressed

• Restores brake pressure and pedal feel in BMW 128i vehicles
• Replaces worn or leaking master cylinders causing brake fluid loss
• Solves issues related to spongy or unresponsive brake pedals
• Addresses internal seal failures within the brake hydraulic system
• Prevents brake system failure due to master cylinder wear

Installation Notes and Tips

When installing the Dorman M630770 master cylinder, ensure the brake system is properly bled to remove any air pockets. Since mounting hardware and reservoir are not included, verify compatibility with existing components or acquire necessary parts before installation. Use appropriate tools to avoid damaging the M12 x 1.0 threaded outlets during brake line connection. Follow manufacturer torque specifications for secure fitting.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction provides resistance to corrosion and wear, contributing to reliable brake system performance. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in material and workmanship.