OE Quality
60-Day Returns

Raybestos MC391422 Brake Master Cylinder
Reliable Brake Master Cylinder for Audi Models
The Raybestos Element3; New Brake Master Cylinder MC391422 is engineered to restore precise brake hydraulics for select Audi vehicles. Designed with durable aluminum construction and exact fitment specifications, this master cylinder supports consistent braking performance for Audi A4, A5, S4, S5, A8 Quattro, and S8 models.
- Constructed from lightweight, corrosion-resistant aluminum
- Two mounting holes with 0.670-inch diameter for secure installation
- 1.000-inch bore size optimized for brake fluid pressure control
- Primary and secondary port threads sized M12x1 for compatibility with brake lines
- Compatible with Audi A4, A4 Quattro, A5, A5 Quattro, A8 Quattro, S4, S5, and S8
About the Raybestos Element3; New Product Line
The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components with precise engineering and durable materials. This product line emphasizes quality construction and fitment accuracy, ensuring that the MC391422 brake master cylinder meets the specific requirements of various Audi models. The use of aluminum material in this line provides corrosion resistance and longevity under demanding driving conditions.
Detailed Product Description
The MC391422 brake master cylinder features a 1.000-inch bore size designed to maintain proper hydraulic pressure within the brake system. Its aluminum body offers a balance of strength and weight savings, reducing the risk of corrosion over time. The two mounting holes, each with a diameter of 0.670 inches, allow for secure attachment to the vehicle’s brake system. Both the primary and secondary ports use M12x1 thread sizes, ensuring compatibility with standard brake line fittings on compatible Audi models.
Common Applications and Problem Resolution
- Restores brake fluid pressure for consistent pedal feel
- Replaces worn or leaking master cylinders causing brake failure
- Eliminates spongy or unresponsive brake pedal issues
- Addresses internal seal wear that leads to fluid leaks
- Improves overall brake system reliability on Audi A4, A5, and S series vehicles
Installation Notes and Tips
- Ensure brake fluid system is properly bled after installation to remove air
- Verify mounting hole alignment with vehicle specifications before securing
- Use compatible brake fluid as recommended by Audi manufacturer guidelines
- Inspect brake lines and fittings for wear or damage during installation
- Follow torque specifications for mounting bolts to avoid damage
Quality Assurance and Warranty
Raybestos manufactures the MC391422 brake master cylinder to meet strict quality standards for brake hydraulics components. The Element3; New product line undergoes rigorous testing to ensure durability and performance. While specific warranty details may vary, Raybestos typically offers coverage against defects in materials and workmanship to provide confidence in product reliability.
| Brand | Raybestos |
|---|---|
| Part Number | MC391422 |
| Position | Element3; New, N/A |
| Bore Size | 1.000 |
| Master Cylinder Material | Aluminum |
| Mounting Hole Diameter | 0.670 |
| Mounting Hole Quantity | 2 |
| Primary Port Thread A | M12x1 |
| Secondary Port Thread A | M12x1 |
This part fits 43 vehicles. Search below:
| Year | Make | Model | Submodel | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2018 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2018 | Audi | S8 | N/A | Raybestos Element 3 | ||||
| 2017 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2017 | Audi | S8 | N/A | Element3; New | ||||
| 2016 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2016 | Audi | S8 | N/A | Element3; New | ||||
| 2015 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2015 | Audi | S8 | N/A | Element3; New | ||||
| 2014 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2014 | Audi | S8 | N/A | Element3; New | ||||
| 2013 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2013 | Audi | S8 | N/A | Element3; New | ||||
| 2012 | Audi | A4 | N/A | Girling Cylinder; Element3; New | ||||
| 2012 | Audi | A4 Quattro | N/A | Girling Cylinder; Element3; New | ||||
| 2012 | Audi | A5 | N/A | Girling Cylinder; Element3; New | ||||
| 2012 | Audi | A5 Quattro | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2012 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2012 | Audi | S4 | N/A | ATE Cylinder; Element3; New | ||||
| 2012 | Audi | S5 | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2011 | Audi | A4 | N/A | Girling Cylinder; Element3; New | ||||
| 2011 | Audi | A4 | Base | N/A | Except GIRLING Master Cylinder; Element3; New | |||
| 2011 | Audi | A4 Quattro | N/A | Girling Cylinder; Element3; New | ||||
| 2011 | Audi | A5 | N/A | Girling Cylinder; Element3; New | ||||
| 2011 | Audi | A5 Quattro | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2011 | Audi | A8 Quattro | N/A | Element3; New | ||||
| 2011 | Audi | S4 | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2011 | Audi | S5 | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2010 | Audi | A4 | N/A | Girling Cylinder; Element3; New | ||||
| 2010 | Audi | A4 | Base | N/A | Except GIRLING Master Cylinder; Element3; New | |||
| 2010 | Audi | A4 Quattro | N/A | Girling Cylinder; Element3; New | ||||
| 2010 | Audi | A5 | N/A | Girling Cylinder; Element3; New | ||||
| 2010 | Audi | A5 Quattro | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2010 | Audi | A8 Quattro | 4.2L | V8 | N/A | Raybestos Element 3 | ||
| 2010 | Audi | S4 | N/A | Girling Cylinder; Element3; New | ||||
| 2010 | Audi | S5 | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2009 | Audi | A4 | Base | Sedan | N/A | Except GIRLING Master Cylinder; Element3; New | ||
| 2009 | Audi | A4 Quattro | N/A | Girling Cylinder; Element3; New | ||||
| 2009 | Audi | A5 | N/A | with Girling Brakes; Raybestos Element 3 | ||||
| 2009 | Audi | A5 Quattro | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2009 | Audi | S5 | N/A | Compatible with vehicles equipped with Girling Brakes.; Element3; New | ||||
| 2008 | Audi | A5 | N/A | Girling Cylinder; Raybestos Element 3 | ||||
| 2008 | Audi | A5 Quattro | N/A | Girling Cylinder; Element3; New | ||||
| 2008 | Audi | S5 | N/A | Girling Cylinder; 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.