Dorman M630670 Brake Master Cylinder

Reliable Brake Master Cylinder for BMW and Saturn Vehicles

The Dorman M630670 brake master cylinder is engineered to provide consistent hydraulic pressure for your vehicle's braking system. Designed specifically for select BMW and Saturn models, this aluminum master cylinder ensures durability and precise performance without the need for additional mounting hardware or sensors.

• Master cylinder bore diameter: 1 inch for optimal hydraulic control
• Constructed from durable aluminum material for corrosion resistance
• Includes two outlets with M12 x 1.0 thread size for secure brake line connections
• Does not include reservoir or sensor, allowing compatibility with existing components
• Package contains the master cylinder only, no mounting hardware included

Technical Details and Compatibility

The Dorman M630670 brake master cylinder features a 1-inch bore diameter, which is critical for maintaining proper brake fluid pressure and pedal feel. Its aluminum construction offers a balance of strength and lightweight design, helping to resist corrosion and wear over time. The unit includes two outlets, both with M12 x 1.0 thread pitch, suitable for connecting to the brake lines on compatible vehicles. This master cylinder is designed without a reservoir or sensor, making it ideal for replacement in vehicles where these components remain intact.

This part is compatible with a range of BMW models including the 135i, 135is, 325i, 325xi, 328i, 328i xDrive, 328xi, 335d, 335i, 335is, 335i xDrive, and 335xi. It also fits the Saturn Astra and BMW X1 models, ensuring a precise fit and reliable operation when replacing the brake master cylinder.

Common Applications and Problem Resolution

• Restores proper brake pedal pressure and responsiveness
• Eliminates brake fluid leaks caused by worn or damaged master cylinders
• Resolves spongy or inconsistent brake pedal feel
• Prevents brake system failure due to internal seal wear
• Addresses brake warning light issues related to master cylinder malfunction

Installation Notes and Tips

• Ensure the brake fluid reservoir and sensors are compatible and in good condition before installation
• Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic pressure
• Use appropriate tools for M12 x 1.0 outlet fittings to avoid thread damage
• Verify compatibility with your specific BMW or Saturn model year and brake system configuration

Quality Assurance and Warranty Information

Dorman manufactures the M630670 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction provides corrosion resistance and long service life. While mounting hardware and reservoir are not included, the part is designed for straightforward replacement in compatible vehicles. Warranty coverage details can be obtained from the product documentation or Dorman directly, ensuring confidence in the part's reliability and performance.