TRW PML447 Brake Master Cylinder

Overview of TRW Brake Master Cylinder PML447

The TRW Brake Master Cylinder PML447 is engineered for reliable brake hydraulics performance in select Mercedes-Benz models. Designed with precision, this master cylinder supports consistent brake pressure and control for vehicles such as the C32 AMG, CLK55 AMG, and SLK350.

• 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
• Equipped with three ports and two mounting holes for secure installation
• Compatible with multiple Mercedes-Benz models including C230, C280, and CLK500

Technical Specifications and Features

The PML447 master cylinder features a 20.64 mm primary bore diameter and a 25.4 mm secondary bore diameter, ensuring proper hydraulic pressure distribution. It includes two pistons to maintain consistent brake fluid flow and pressure. The aluminum construction offers durability while minimizing weight. This part does not include a reservoir, brake booster, or mounting hardware, so it is designed to integrate with existing vehicle components. The dust boot and gasket included help protect internal components from contaminants and maintain system integrity. The master cylinder has three ports with M12 - 1.0 thread sizes for both primary and secondary outlets, facilitating secure brake line connections.

Compatible Mercedes-Benz Models

This TRW brake master cylinder PML447 is compatible with a range of Mercedes-Benz vehicles, including:

• C32 AMG, C55 AMG, C230, C240, C280, C320, C350
• CLK55 AMG, CLK63 AMG, CLK320, CLK350, CLK500, CLK550
• SLK55 AMG, SLK280, SLK300, SLK350

Common Applications and Problem Resolution

This master cylinder is used to replace worn or failing brake master cylinders in compatible Mercedes-Benz models. It addresses issues such as:

• Spongy or unresponsive brake pedal feel
• Brake fluid leaks around the master cylinder
• Reduced hydraulic pressure causing poor braking performance
• Brake pedal sinking or inconsistent brake engagement
• Contaminated or damaged internal seals affecting brake system integrity

Installation Notes and Tips

Installation of the TRW PML447 requires removal of the existing master cylinder and careful connection to the brake lines using the specified M12 - 1.0 threaded ports. Since mounting hardware and reservoir are not included, ensure existing components are in good condition or replaced as needed. Bleeding the brake system thoroughly after installation is essential to remove air and restore proper brake function. Use caution to avoid contamination of brake fluid and maintain cleanliness during installation.

Quality Assurance and Warranty

Manufactured by TRW, a recognized name in automotive brake components, the PML447 brake master cylinder is built to meet OEM specifications for fit and function. The aluminum construction and included seals contribute to long-term durability. Warranty coverage details should be confirmed at the point of purchase, as TRW typically offers limited warranties covering defects in materials and workmanship.