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Raybestos MC391245 Brake Master Cylinder
| Brand | Raybestos MC391245 |
|---|---|
| Mounting Hole Quantity | 2 |
| Master Cylinder Material | Aluminum |
| Mounting Hole Diameter | 0.343 |
| Bore Size | 26.000 |
| Number of Ports | 2 |
| Primary Port Thread A | M12x1 |
| Secondary Port Thread A | M12x1 |
| Product line | Element3; New |
| Fits | Pontiac · 2 vehicles |
Aluminum construction. Helps keep the brake master cylinder lightweight and corrosion resistant.
Dual-port design. Provides two fluid connections for a clean hydraulic setup.
Element3 line. Raybestos engineering focused on dependable brake performance.
Cross-references Centric Parts 130.62159, 10-3700 and 10-4210 for the same application. See all 8.
Raybestos MC391245 Brake Master Cylinder
The Raybestos MC391245 brake master cylinder is a direct-fit hydraulic replacement for select Pontiac G8 applications. Built with an aluminum master cylinder body and a 26.000 bore size, it is engineered for consistent brake pedal response and reliable hydraulic pressure delivery.
Compatible with 2008-2009 Pontiac G8, this Raybestos Element3; New brake master cylinder is built around the application-specific port layout and mounting dimensions needed for a proper replacement. The MC391245 is a practical choice when servicing a Pontiac G8 brake hydraulic system that requires a 2-port, aluminum master cylinder with M12x1 primary and secondary port threads.
Key Features
- Raybestos brake master cylinder, part number MC391245
- Element3; New product line for application-specific brake service
- Aluminum master cylinder construction
- 26.000 bore size for hydraulic system performance
- 2 mounting holes with 0.343 mounting hole diameter
- 2 ports with M12x1 primary and secondary port threads
- Compatible with 2008-2009 Pontiac G8
Detailed Description
Raybestos MC391245 is a brake master cylinder designed for the 2008-2009 Pontiac G8 and built to match the vehicle’s hydraulic connection requirements. The aluminum housing helps keep the unit lightweight while maintaining the structural support needed in a master cylinder assembly. With two mounting holes, two ports, and M12x1 thread specifications on both the primary and secondary ports, this part is specified for a precise brake system replacement on the Pontiac G8.
The Raybestos Element3; New line focuses on service parts that align with the original application layout, making MC391245 a straightforward option when replacing a worn or leaking master cylinder. This part cross-references Centric Parts 130.62159 for the same application.
What It Helps Address
- Brake pedal that feels soft or sinks under pressure
- Internal master cylinder leakage
- Loss of hydraulic pressure in the brake system
- Brake warning light concerns tied to master cylinder performance
- Uneven or inconsistent brake response on a Pontiac G8
Installation Notes and Tips
Before installation, verify the bore size, port thread size, and mounting hole layout against the removed unit. Bench bleeding the master cylinder before final installation helps reduce trapped air in the hydraulic system. After installation, inspect all brake line connections at the M12x1 ports and confirm a firm pedal before returning the vehicle to service.
Quality Assurance
Raybestos brake hydraulics are built for application-specific fitment and service reliability. The MC391245 is part of the Element3; New line and is specified for direct replacement use on the listed Pontiac G8 model years.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2009 | Pontiac | G8 | N/A | Element3; New |
| 2008 | Pontiac | G8 | N/A | Element3; New |
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