Dorman M39812 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Metro and Suzuki Swift

The Dorman M39812 brake master cylinder is engineered to provide consistent hydraulic pressure for your vehicle's braking system. Designed specifically for Chevrolet Metro, Geo Metro, and Suzuki Swift models, this master cylinder ensures precise brake control and safety.

• Master cylinder bore diameter: 0.813 inches for optimal hydraulic performance
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for complete brake hydraulics functionality
• Features three outlets with a rearward outlet size of M10 x 1.0 and a thread pitch of 1.0
• Secondary outlet thread diameter measures 10 mm
• Package contains the master cylinder only; mounting hardware not included

Technical Details and Compatibility

The Dorman M39812 brake master cylinder is crafted from aluminum, providing a lightweight yet sturdy component that resists corrosion and wear. Its 0.813-inch bore diameter is calibrated to deliver consistent hydraulic pressure, essential for effective braking. The included reservoir and sensor integrate seamlessly with the brake hydraulics system, supporting accurate fluid level monitoring and brake performance. With three outlets, including a rearward outlet sized M10 x 1.0 and a secondary outlet thread diameter of 10 mm, this master cylinder fits the brake lines of Chevrolet Metro, Geo Metro, and Suzuki Swift models precisely. The thread pitch of 1.0 ensures secure connections during installation.

Common Applications and Problem Resolution

This brake master cylinder is used to replace worn or damaged units in compatible vehicles, restoring proper brake function. It addresses issues such as:

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks around the master cylinder
• Inconsistent brake pressure causing uneven braking
• Faulty brake fluid level sensor triggering warning lights
• Corrosion or wear compromising hydraulic integrity

Installation Notes and Tips

Installation requires removal of the old master cylinder and careful connection of brake lines to the three outlets, ensuring the rearward outlet (M10 x 1.0) and secondary outlet (10 mm thread diameter) are properly secured. Bleeding the brake system after installation is necessary to remove air and restore full braking efficiency. Note that mounting hardware is not included, so retain original fasteners or acquire appropriate replacements.

Quality Assurance and Warranty

Dorman manufactures the M39812 brake master cylinder to meet or exceed OEM specifications for Chevrolet Metro, Geo Metro, and Suzuki Swift vehicles. The aluminum construction and integrated sensor contribute to long-term reliability. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship.