OE Quality
60-Day Returns

Raybestos MC391010 Brake Master Cylinder
Reliable Brake Master Cylinder for Buick, Chevrolet, Pontiac, and Saturn
The Raybestos Element3; New Brake Master Cylinder MC391010 is engineered to provide consistent hydraulic pressure for your vehicle's braking system. Designed specifically for select Buick, Chevrolet, Pontiac, and Saturn models, this master cylinder ensures precise brake fluid control and reliable stopping power.
- Constructed from durable aluminum for corrosion resistance and lightweight performance
- Features a 1.000-inch bore size for optimal hydraulic pressure
- Includes two mounting holes with a diameter of 0.433 inches for secure installation
- Equipped with two ports, both with M12x1 thread size for compatibility with brake lines
- Compatible with Buick Montana, Chevrolet Uplander, Pontiac Montana, Saturn Relay, and Terraza models
About the Raybestos Element3; New Product Line
The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components that meet or exceed OEM specifications. This brake master cylinder is part of that line, offering a balance of quality materials and precise engineering to maintain brake system integrity and performance in your Buick, Chevrolet, Pontiac, or Saturn vehicle.
Detailed Product Description
The MC391010 brake master cylinder is crafted from aluminum, providing a lightweight yet durable solution for your vehicle's brake hydraulics. Its 1.000-inch bore size is designed to generate the necessary hydraulic pressure for effective braking. The two mounting holes, each with a 0.433-inch diameter, ensure a secure fit during installation. Additionally, the master cylinder features two ports with M12x1 threading, compatible with standard brake lines for easy integration into your vehicle's braking system.
Common Applications and Issues Addressed
- Restores proper brake fluid pressure in Buick Montana and Pontiac Montana models
- Replaces worn or leaking master cylinders in Chevrolet Uplander and Saturn Relay vehicles
- Solves brake pedal sponginess or failure to build pressure
- Addresses brake fluid leaks from the master cylinder assembly
- Improves overall brake system responsiveness and safety
Installation Notes and Tips
Ensure the vehicle is securely lifted and supported before beginning installation. Carefully remove the old master cylinder and inspect brake lines for wear or damage. When installing the MC391010, verify that the two mounting holes align properly and that the M12x1 threaded ports are securely connected to the brake lines. Bleed the brake system thoroughly after installation to remove any air and restore proper hydraulic pressure.
Quality Assurance and Warranty
Raybestos manufactures the MC391010 brake master cylinder to meet stringent quality standards, ensuring reliable performance and durability. This part is backed by Raybestos' quality assurance protocols, providing confidence in its fitment and function for compatible Buick, Chevrolet, Pontiac, and Saturn models.
| Brand | Raybestos |
|---|---|
| Part Number | MC391010 |
| Position | Element3; New, N/A |
| Bore Size | 1.000 |
| Master Cylinder Material | Aluminum |
| Mounting Hole Diameter | 0.433 |
| Mounting Hole Quantity | 2 |
| Number of Ports | 2 |
| Primary Port Thread A | M12x1 |
| Secondary Port Thread A | M12x1 |
This part fits 16 vehicles. Search below:
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2009 | Chevrolet | Uplander | N/A | Element3; New | |
| 2009 | Pontiac | Montana | N/A | Element3; New | |
| 2008 | Chevrolet | Uplander | N/A | Element3; New | |
| 2008 | Pontiac | Montana | N/A | Element3; New | |
| 2007 | Buick | Terraza | N/A | Element3; New | |
| 2007 | Chevrolet | Uplander | N/A | Element3; New | |
| 2007 | Pontiac | Montana | N/A | Element3; New | |
| 2007 | Saturn | Relay | N/A | Element3; New | |
| 2006 | Buick | Terraza | N/A | Element3; New | |
| 2006 | Chevrolet | Uplander | N/A | Element3; New | |
| 2006 | Pontiac | Montana | N/A | Element3; New | |
| 2006 | Saturn | Relay | N/A | Element3; New | |
| 2005 | Buick | Terraza | N/A | Element3; New | |
| 2005 | Chevrolet | Uplander | N/A | Element3; New | |
| 2005 | Pontiac | Montana | SV6 | N/A | Element3; New |
| 2005 | Saturn | Relay | 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.