TRW PMK479 Brake Master Cylinder

Overview of TRW PMK479 Brake Master Cylinder

The TRW PMK479 brake master cylinder is engineered for reliable brake hydraulics performance in select Mercedes-Benz models. Designed with precision, this component ensures consistent brake pressure and responsiveness for vehicles like the Mercedes-Benz C230, C280, CLK320, and SLK230.

• Constructed from durable aluminum for strength and corrosion resistance
• Includes dust boot and gasket/seal for protection and leak prevention
• Features a straight bore design with dual pistons for balanced braking
• Two mounting holes with 8.8 mm diameter for secure installation
• Three ports with M12 - 1.0 thread size for primary and secondary outlets

Technical Details and Specifications

The TRW PMK479 brake master cylinder is built with a 19.05 mm primary bore diameter and a larger 23.81 mm secondary bore diameter, optimizing hydraulic pressure distribution. The aluminum master cylinder body offers durability while maintaining a lightweight profile. This unit comes with a dust boot and gasket or seal included to protect internal components and maintain system integrity. It does not include a reservoir, brake booster, push rod, or mounting hardware, so these components must be sourced separately if needed. The master cylinder features two mounting holes with an 8.8 mm diameter, ensuring compatibility with the specified Mercedes-Benz models.

Compatible Vehicles and Applications

This brake master cylinder is compatible with the following Mercedes-Benz vehicles:

• Mercedes-Benz C230
• Mercedes-Benz C280
• Mercedes-Benz CLK320
• Mercedes-Benz SLK230

It is designed to replace the original equipment part and restore proper brake hydraulic function in these models.

Common Issues Addressed by TRW PMK479

• Brake pedal sinking or sponginess due to master cylinder wear
• Brake fluid leaks around the master cylinder seals
• Uneven brake pressure causing inconsistent braking performance
• Failure of the master cylinder bore leading to reduced braking efficiency
• Corrosion or damage to the master cylinder body affecting brake hydraulics

Installation Notes and Tips

When installing the TRW PMK479 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic pressure. Since mounting hardware and reservoir are not included, verify compatibility with existing components or acquire necessary parts separately. Inspect the brake booster and push rod for wear or damage during installation. Use the included gasket or seal to prevent leaks and ensure a secure fit. Follow manufacturer torque specifications for mounting bolts to avoid damage.

Quality Assurance and Warranty

TRW manufactures the PMK479 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and included seals contribute to long-term reliability. While specific warranty details are not provided, TRW products typically come with a limited warranty covering defects in materials and workmanship. Refer to TRW documentation for exact warranty terms.