Dorman M39971 Brake Master Cylinder

Reliable Brake Master Cylinder for Acura Legend, RL, and TL

The Dorman M39971 brake master cylinder is engineered to restore proper brake hydraulics in Acura Legend, RL, and TL models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

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

Product Details and Specifications

The Dorman M39971 brake master cylinder is specifically designed for Acura Legend, RL, and TL vehicles, providing a direct replacement for the original equipment part. Its 1-inch bore diameter allows for precise brake fluid control, while the aluminum construction offers durability and resistance to corrosion. The included reservoir simplifies installation and maintenance by housing the brake fluid securely. Additionally, the integrated sensor helps maintain system integrity by providing real-time feedback on brake fluid levels or pressure. The master cylinder features two outlets, including a rearward outlet sized M12 x 1.0 and a secondary outlet with a 10 mm thread diameter, both with a 1.0 thread pitch to ensure compatibility with factory brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Acura Legend, RL, and TL brake systems
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Resolves sensor-related brake warning light activations
• Improves overall brake system reliability and safety

Installation Notes and Tips

Installation of the Dorman M39971 brake master cylinder requires basic mechanical skills and proper brake system knowledge. Since mounting hardware is not included, retain original fasteners or acquire compatible hardware before installation. Ensure all brake lines are properly connected to the two outlets, matching the rearward outlet size M12 x 1.0 and secondary outlet thread diameter 10 mm. Bleed the brake system thoroughly after installation to remove air and restore optimal brake pedal feel. Verify sensor connections to maintain accurate brake system monitoring.

Quality Assurance and Warranty

Dorman manufactures the M39971 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term reliability. This part is backed by Dorman's limited warranty, providing coverage against defects in material and workmanship under normal use conditions.