Dorman M39970 Brake Master Cylinder

Reliable Brake Master Cylinder for Acura, Honda, and Isuzu Vehicles

The Dorman M39970 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Acura, Honda, and Isuzu models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

• Master cylinder bore diameter: 1 inch for accurate fluid displacement
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for brake fluid storage
• Equipped with sensor to monitor brake system status
• Two outlets with secondary outlet thread diameter of 10 mm and rearward outlet size M12 x 1.0
• Thread pitch of 1.0 for secure fitting
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M39970 master cylinder is designed specifically for brake hydraulics applications in Acura Accord, CL, TL, Honda Odyssey, Prelude, and Isuzu Oasis models. Its 1-inch bore diameter allows for precise control of brake fluid pressure, while the aluminum construction provides strength and resistance to corrosion over time. The included reservoir simplifies installation and maintenance by housing the brake fluid directly on the unit. Additionally, the integrated sensor helps monitor brake system performance, enhancing safety and diagnostics. The master cylinder features two outlets, including a secondary outlet with a 10 mm thread diameter and a rearward outlet sized M12 x 1.0, both with a 1.0 thread pitch to ensure compatibility with OEM brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure in vehicles experiencing soft or spongy brake pedal feel
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses brake warning light activation due to sensor faults
• Improves brake system responsiveness in Acura Accord, Honda Odyssey, and Isuzu Oasis
• Resolves issues related to inconsistent brake pedal travel or pressure

Installation Notes and Tips

Installation of the Dorman M39970 master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Mounting hardware is not included, so reuse existing hardware or acquire compatible fasteners. Verify thread sizes and pitch for brake line connections to avoid leaks. It is recommended to inspect brake lines and related components during installation for wear or damage.

Quality Assurance and Warranty Information

Dorman manufactures the M39970 master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term reliability. This part is backed by Dorman's standard warranty coverage, providing confidence in its durability and performance for Acura, Honda, and Isuzu brake systems.