OE Quality
60-Day Returns

Raybestos MC391051 Brake Master Cylinder
Reliable Brake Master Cylinder for Mazda 6
The Raybestos Element3; New Brake Master Cylinder MC391051 is engineered to restore precise brake hydraulics for your Mazda 6. Designed with durable aluminum construction and exact fitment specifications, this master cylinder ensures consistent braking performance.
- Compatible with Mazda 6 models
- Constructed from lightweight, corrosion-resistant aluminum
- Two mounting holes with 0.343-inch diameter for secure installation
- 0.813-inch bore size for optimal hydraulic pressure
- Two ports with M10x1 thread size for primary and secondary connections
Detailed Product Features and Specifications
This Raybestos brake master cylinder (part number MC391051) features a robust aluminum body that offers strength and resistance to corrosion, essential for long-term brake system reliability. The unit includes two mounting holes, each with a diameter of 0.343 inches, ensuring a precise and secure fit on the brake assembly. The 0.813-inch bore size is designed to provide the correct hydraulic pressure needed for effective brake operation. Both the primary and secondary ports have M10x1 threading, compatible with standard brake line fittings, facilitating straightforward installation and maintenance.
About the Element3; New Product Line
The Element3; New line by Raybestos focuses on delivering brake hydraulics components that meet or exceed OEM specifications. This product line emphasizes material quality and dimensional accuracy, making it suitable for professional repairs and replacements. The MC391051 brake master cylinder is part of this line, ensuring it aligns with the performance and durability standards expected for Mazda 6 brake systems.
Common Applications and Problem Resolution
- Restores proper brake pedal feel and responsiveness
- Eliminates brake fluid leaks from a worn or damaged master cylinder
- Resolves inconsistent braking pressure or spongy brake pedal issues
- Replaces faulty or corroded master cylinders in Mazda 6 brake hydraulics
- Supports safe and reliable brake system operation
Installation Notes and Tips
Ensure the brake system is fully depressurized before removing the old master cylinder. Verify that the mounting holes align correctly with the vehicle’s brake assembly using the 0.343-inch diameter holes. Use compatible brake lines with M10x1 threaded fittings for both primary and secondary ports. After installation, bleed the brake system thoroughly to remove any air and confirm proper hydraulic pressure. Follow all manufacturer torque specifications to avoid damage.
Quality Assurance and Warranty
Raybestos provides this brake master cylinder with quality assurance that it meets OEM fit and function standards. The aluminum construction offers corrosion resistance and durability under normal operating conditions. Warranty details should be confirmed with the point of purchase or Raybestos directly, as coverage may vary.
| Brand | Raybestos |
|---|---|
| Part Number | MC391051 |
| Position | Element3; New, N/A |
| Bore Size | 0.813 |
| Master Cylinder Material | Aluminum |
| Mounting Hole Diameter | 0.343 |
| Mounting Hole Quantity | 2 |
| Number of Ports | 2 |
| Primary Port Thread A | M10x1 |
| Secondary Port Thread A | M10x1 |
This part fits 3 vehicles. Search below:
| Year | Make | Model | Transmission | Position | Notes |
|---|---|---|---|---|---|
| 2005 | Mazda | 6 | Automatic | N/A | Element3; New |
| 2004 | Mazda | 6 | Automatic | N/A | Element3; New |
| 2003 | Mazda | 6 | Automatic | N/A | Element3; New |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.