Dorman M390420 Brake Master Cylinder

Reliable Brake Master Cylinder for Mazda Protege

The Dorman M390420 brake master cylinder is designed specifically for Mazda Protege models, providing precise hydraulic control for your vehicle's braking system. This aluminum master cylinder includes a reservoir and sensor to ensure optimal performance and safety.

• Master cylinder bore diameter: 0.875 inches
• Constructed from durable aluminum material
• Includes reservoir for fluid storage
• Equipped with a sensor for monitoring brake system status
• Three outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm
• Mounting hardware not included

Detailed Product Description

The Dorman M390420 brake master cylinder is engineered to meet the hydraulic requirements of Mazda Protege vehicles. Its 0.875-inch bore diameter ensures consistent brake fluid pressure, while the aluminum construction offers corrosion resistance and long-lasting durability. The included reservoir allows for proper brake fluid containment, and the integrated sensor provides real-time feedback to the vehicle’s brake system. Featuring three outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, this master cylinder supports efficient brake fluid distribution. Note that mounting hardware is not included with this part.

Common Applications and Issues Addressed

• Restores proper brake fluid pressure and pedal feel
• Replaces leaking or damaged master cylinders
• Resolves brake warning light activation due to sensor faults
• Fixes inconsistent braking performance or pedal sinking
• Addresses fluid contamination or reservoir damage

Installation Notes and Tips

• Compatible with Mazda Protege models; verify fitment before installation
• Bleed brake system thoroughly after installation to remove air
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Ensure all connections, including sensor wiring and outlet fittings, are secure
• Mounting hardware must be sourced separately as it is not included

Quality Assurance and Warranty

Dorman manufactures the M390420 brake master cylinder to meet or exceed OEM specifications for Mazda Protege vehicles. The aluminum construction and integrated sensor contribute to reliable brake system operation. While mounting hardware is not included, the part undergoes quality checks to ensure proper fit and function. Warranty details should be confirmed with the point of purchase or manufacturer documentation.