TRW PML420 Brake Master Cylinder

Reliable Brake Master Cylinder for Audi and Volkswagen Models

The TRW PML420 brake master cylinder is engineered to provide consistent hydraulic pressure for your braking system. Designed specifically for select Audi and Volkswagen vehicles, this component ensures precise brake control and safety.

• Constructed from durable aluminum for long-lasting performance
• Includes dust boot and gasket/seal for protection and leak prevention
• Features a straight bore type with a 25.4 mm diameter for optimal fluid flow
• Equipped with two pistons and two ports to support dual-circuit braking systems
• Compatible with Audi A4, A4 Quattro, A6, A6 Quattro, S6, and Volkswagen Passat models

Technical Details and Specifications

The TRW PML420 brake master cylinder is built with an aluminum body that resists corrosion and heat, ensuring reliable operation under demanding conditions. It features a straight bore design with a 25.4 mm diameter, supporting efficient hydraulic pressure delivery. The unit includes two pistons to manage dual brake circuits, enhancing safety and braking performance. A dust boot and gasket/seal are included to protect internal components from contaminants and maintain a secure seal. This master cylinder has two mounting holes and two ports with M12 - 1.0 thread size for secure installation and fluid connection. Note that the reservoir, brake booster, push rod, bleeder screw, and mounting hardware are not included with this part.

Compatible Vehicles and Applications

This brake master cylinder is compatible with a range of Audi and Volkswagen models, including:

• Audi A4 and A4 Quattro
• Audi A6 and A6 Quattro
• Audi S6
• Volkswagen Passat

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

Common Issues Addressed by the TRW PML420

• Brake pedal feels spongy or sinks to the floor
• Loss of hydraulic pressure causing reduced braking efficiency
• Brake fluid leaks around the master cylinder area
• Uneven braking or poor brake response
• Contaminated or damaged internal seals leading to brake failure

Installation Notes and Tips

When installing the TRW PML420 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Use compatible brake fluid as specified by the vehicle manufacturer. Since mounting hardware and reservoir are not included, reuse existing components or source replacements as needed. Verify the mounting hole alignment and port connections for a secure fit. Proper installation is critical for safe brake system operation.

Quality Assurance and Warranty

TRW manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and included seals contribute to durability and leak resistance. While specific warranty details are not provided here, TRW products typically come with a limited warranty against defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.