Toyota Yaris P9 Brake Servo Master Cylinder Unit Asssembly 47200-0D390-A

Toyota Yaris P9 Brake Servo Master Cylinder Unit Asssembly is a complete brake booster unit designed for the braking system of this model. As a component from the Brake Servos and Proportioning Valves group, it ensures stable transmission of brake pedal pressure into hydraulic circuit pressure, which translates into predictable and safe deceleration. The used OEM Toyota component is a sensible choice for professional brake system repairs when you prioritize factory performance characteristics and robust construction.

Specifications and technical data

• SKU: RHD-472000D390A
• Mark: Toyota
• Condition: Used
• OEM Part Number: 472000D390A
• Substitutable numbers: 472000D390A, 47200-0D390-A
• Part type: Brake Servo & Master Cylinder
• Category: Brake Servos

Purpose and role in the braking system

The described brake servo and master cylinder unit has been designed specifically for the Toyota Yaris P9 generation, maintaining original mounting geometry and operating parameters. The servo is responsible for assisting the pressure applied to the brake pedal, utilizing engine vacuum to reduce driver effort, while the integrated master cylinder converts pedal movement into hydraulic pressure in the brake circuits. Thanks to this, the system maintains predictable braking force modulation, which is crucial in both daily city driving and emergency situations.

Construction of the servo + master cylinder set

The complete unit includes the brake servo housing and the integrated master cylinder, which facilitates installation and reduces the risk of leaks at connections. The Toyota OEM design ensures:

• factory fitment to the vehicle's bulkhead,
• proper transmission of the brake pedal lever ratio to the master cylinder piston,
• stable cooperation with the vehicle's existing hydraulic system. Such a solution allows for maintaining the original pedal feel, without the need for adaptation or modification of other brake system components.

Application of the used OEM part

The used Toyota brake servo and master cylinder unit is a practical alternative to new aftermarket replacements of unknown origin. The original component from the same production series as the factory equipment for the Yaris P9 ensures:

• material and structural consistency with other system components,
• preservation of factory assistance parameters and braking force modulation,
• the possibility of economical repair while maintaining OEM standards. Additionally, the presence of the OEM part number and interchangeable numbers in the technical specification facilitates verification of compatibility with a specific vehicle equipment version, which is important for professional part selection.

Support for selection and brake system upgrades

If you are planning a comprehensive repair or upgrade of the braking zone in your Toyota and need other elements from the same group, such as servos, brake proportioning valves, or complete booster modules, check the available parts in the Toyota Brake Servos and Proportioning Valves category. When working on the brake system and other key vehicle systems, it is worth simultaneously ensuring the efficiency of the air conditioning and heating system, which affect driver comfort and concentration – practical tips on selecting used OEM components and service schedules can be found in the article Air conditioning and heating – part selection and maintenance for year-round comfort.

Summary

Toyota Yaris P9 – brake servo with master cylinder is a functional, used OEM element from the Brake Servos and Proportioning Valves category, intended for direct application in the braking system of this model. Choosing a complete servo-master cylinder unit allows you to reduce installation time, maintain factory assistance parameters, and restore proper brake system operation at controlled repair costs.