Toyota Avensis T27 Brake Servo Booster Master Cylinder Reservoir 4720005280

Toyota Avensis T27 Brake Servo Booster Master Cylinder Reservoir integrated with the master cylinder and brake fluid reservoir is a factory-original brake system component, designed specifically for this model. The original Toyota construction ensures stable braking force transmission, predictable pedal operation, and proper cooperation with other system components. This solution is intended for users who want to maintain consistent braking parameters in line with factory specifications.

Specifications and technical data

• SKU: RHD-4720005280
• Mark: Toyota
• Condition: Used
• OEM Part Number: 4720005280
• Substitutable numbers: 4720005280
• Part type: Brake Servo
• Category: Brake Servos

Purpose and function in the brake system

The presented brake servo with master cylinder and reservoir is a component from the Brake Servos and Proportioning Valves group, responsible for assisting the pressure force on the brake pedal and proper metering of pressure in the circuits. Using a complete assembly allows for maintaining:

• appropriate force transmission between the pedal and the brake calipers,
• correct operating pressure in the system,
• consistent operating characteristics with the factory pump and brake proportioning valve. Thanks to this, the driver receives a predictable vehicle response to pedal depression, which translates into safe and repeatable braking in daily operation.

Assembly construction: servo, pump, and reservoir

The brake assistance in the Toyota Avensis T27 in this configuration constitutes an assembly where the servo, master cylinder, and brake fluid reservoir work as a single unit. Such a design:

• simplifies the installation and removal of the entire module,
• reduces the risk of leaks at the connections between components,
• ensures consistent operating parameters across the entire range of operating pressures. The original Toyota solution was designed to maintain proper system rigidity, which is important for a perceptible, linear brake pedal travel and stable operation of the brake proportioning valve.

Benefits of using an original Toyota component

Using the factory brake assistance assembly in the Avensis T27 allows for maintaining braking parameters consistent with the manufacturer's assumptions. Key advantages include:

• Full compatibility with the Toyota Avensis T27 brake system – no need for adaptation or modification of the installation.
• Consistent cooperation with the factory brake proportioning valve and other system elements.
• Reduction of the risk of bleeding and adjustment problems, typical for inconsistent sets of parts. For users who expect predictable brake system operation and want to avoid experimenting with replacements, the original servo assembly with pump and reservoir is a technically justified solution.

Condition, verification, and service application

The item comes from dismantling and is offered as a used OEM component, which allows combining reasonable cost with maintaining the factory construction. This type of part will work well both for standard brake system repairs and for restoring the original configuration after a collision or a more serious failure. Before installation, a standard service procedure is recommended: leak testing, verification of the servo diaphragm operation, checking the condition of vacuum ports, and proper bleeding of the system after installation. A correctly installed assembly restores factory braking characteristics, which has a direct impact on driving safety.

Brake system expansion and educational materials

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 additional servos, proportioning valves, or related assistance modules, check the available parts in the Toyota Brake Servos and Proportioning Valves category. During service work, it is also worth taking care of systems affecting driving comfort and safety. Practical tips on selecting used OEM components, maintenance schedules, and service procedures can be found in the article Air conditioning and heating – part selection and maintenance for comfort all year round, which helps in planning vehicle maintenance in a consistent and economical way.