Dorman M390039 Brake Master Cylinder

Reliable Brake Master Cylinder for Mazda MPV

The Dorman M390039 brake master cylinder is engineered to restore proper brake hydraulics for Mazda MPV vehicles. Designed with durable cast iron and equipped with a reservoir and sensor, this master cylinder ensures consistent brake performance and safety.

• Master cylinder bore diameter: 0.938 inches for precise hydraulic pressure
• Constructed from cast iron for long-lasting durability
• Includes reservoir for brake fluid storage
• Equipped with a sensor to monitor 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
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M390039 brake master cylinder is specifically designed for the Mazda MPV, providing a precise fit and reliable function. Its 0.938-inch bore diameter allows for accurate hydraulic pressure control, essential for effective braking. The cast iron construction offers strength and resistance to wear, ensuring longevity under demanding conditions. This master cylinder includes a brake fluid reservoir and an integrated sensor, which helps monitor the brake system's performance and alerts to potential issues. Featuring three outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, it supports proper brake line connections for the Mazda MPV's hydraulic system.

Common Applications and Problem Resolution

• Restores brake pressure loss due to worn or damaged master cylinder
• Replaces leaking or cracked brake fluid reservoir
• Resolves brake warning light issues related to sensor failure
• Fixes inconsistent brake pedal feel or sponginess
• Addresses brake fluid contamination or internal seal failure

Installation Notes and Tips

Installation of the Dorman M390039 brake master cylinder requires careful attention to brake system bleeding to remove air and ensure proper hydraulic function. Since mounting hardware is not included, retain or source compatible fasteners for secure installation. Verify thread sizes and outlet connections match the Mazda MPV brake lines to avoid leaks. It is recommended to inspect brake lines and related components during installation for overall system integrity.

Quality Assurance and Warranty

Dorman manufactures the M390039 brake master cylinder to meet or exceed OEM specifications for the Mazda MPV. The cast iron material and integrated sensor contribute to reliable brake system operation. While specific warranty details should be confirmed at purchase, Dorman typically offers limited warranties covering defects in materials and workmanship to ensure customer confidence in product quality.