Dorman M39746 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder for Mazda RX-7

The Dorman M39746 brake master cylinder is designed specifically for Mazda RX-7 models, providing reliable brake hydraulics performance. This cast iron master cylinder includes a reservoir and features a 0.875-inch bore diameter to ensure consistent braking pressure.

• Compatible with Mazda RX-7 brake hydraulic systems
• Master cylinder bore diameter: 0.875 inches
• Durable cast iron construction
• Includes reservoir for fluid storage
• Three outlet ports with rearward outlet size M10 x 1.0
• Secondary outlet thread diameter: 10 mm with 1.0 thread pitch
• Part number M39746 for precise identification

Detailed Product Description

The Dorman M39746 brake master cylinder is engineered to meet the specifications required by Mazda RX-7 vehicles. Constructed from cast iron, this master cylinder offers durability and resistance to wear under typical braking conditions. The 0.875-inch bore diameter is calibrated to provide the correct hydraulic pressure for the RX-7’s braking system. It includes a reservoir to hold brake fluid, ensuring consistent fluid delivery during operation. The unit features three outlets, including a rearward outlet sized M10 x 1.0, and a secondary outlet with a 10 mm thread diameter and 1.0 thread pitch, allowing for proper connection to the brake lines. This part does not include mounting hardware or sensors, so those components must be sourced separately if needed.

Common Applications and Issues Addressed

• Replacement for worn or leaking brake master cylinders on Mazda RX-7
• Restores proper hydraulic pressure for effective braking response
• Resolves brake fluid reservoir leaks or damage
• Addresses inconsistent brake pedal feel due to master cylinder failure
• Fixes brake fluid contamination or internal seal wear

Installation Notes and Tips

When installing the Dorman M39746 brake master cylinder on a Mazda RX-7, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Since mounting hardware is not included, retain or replace bolts and fittings as necessary. Verify thread sizes (M10 x 1.0) for outlet connections to ensure compatibility with existing brake lines. Inspect the brake fluid reservoir for cracks or damage before installation. Professional installation is recommended to maintain safety and performance standards.

Quality Assurance and Warranty

Dorman manufactures the M39746 brake master cylinder to meet or exceed OEM specifications for Mazda RX-7 brake hydraulics. The cast iron construction provides long-lasting durability under normal operating conditions. While mounting hardware and sensors are not included, the master cylinder itself is backed by Dorman’s quality control processes. Please refer to Dorman’s official warranty policy for coverage details.