Mercedes W169 W245 Brake Servo Booster Master Cylinder Unit A1694300330

Mercedes W169 W245 Brake Booster in the form of a complete servo unit with a brake master cylinder is a key component of the braking system, ensuring stable transfer of pedal pressure to the circuit pressure. The offered set comes from the Brake Boosters and Proportioning Valves group and is designed for Mercedes A-Class W169 and B-Class W245 models, guaranteeing factory fit and predictable system operation. This is an OEM solution that allows restoring correct braking characteristics without the need for aftermarket parts with uncertain parameters.

Specifications and technical data

• SKU: A1694300330
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1694300330
• Substitutable numbers: A1694300330, A 169 430 03 30
• Part type: Brake Servo & Master Cylinder
• Category: Brake Servos

Purpose and Function in the Braking System

The servo integrated with the brake master cylinder in the Mercedes A and B-Class is responsible for amplifying pedal pressure and precise pressure metering in the brake circuits. A correctly selected unit ensures:

• stable brake pedal characteristics across the entire operating range,
• repeatable system response during sudden braking,
• consistent operation with the factory ABS/ESP system,
• comfortable, predictable boost force.

By using an original Mercedes solution, compliance with factory safety system calibration is maintained, which is important for both daily use and emergency situations.

Advantages of Using an Original Servo with Master Cylinder

A complete servo unit with a brake master cylinder for the Mercedes W169/W245 is a component designed specifically for the geometry and weight of these models. In practice, this means:

• factory fit to mounting points and brake lines,
• no need for installation modifications or adapters,
• retention of original braking force characteristics between axles,
• consistency with the brake force regulator operating parameters intended by the manufacturer.

Compared to random aftermarket parts, using an original unit helps avoid problems with uneven braking, a too soft or too hard pedal, and incorrect interaction with the vehicle's electronics.

Condition, Verification, and Preparation for Installation

The offered part comes from a Mercedes vehicle and is classified as used, allowing for a reasonable cost while maintaining original specifications. Before being offered, such components are routinely verified for:

• servo vacuum system tightness,
• absence of visible damage to the housing and connection nipples,
• condition of brake line connection sockets.

During installation, it is recommended to use new seals and fresh brake fluid, as well as to bleed the entire system according to the service procedure for W169/W245 models, to fully utilize the potential of the offered unit.

Integration with the Mercedes Brake Boosters and Proportioning Valves System

Replacing the brake servo with a master cylinder often involves inspecting the entire group of components responsible for distributing and boosting braking force. If you are planning a comprehensive repair or upgrade of the braking area in your Mercedes and need other parts from the same group, such as brake boosters, proportioning valves, or complete boost modules, check the available parts in the Mercedes Brake Boosters and Proportioning Valves category.

Safety, Diagnostics, and Technical Knowledge

A properly functioning brake servo with a master cylinder directly impacts driving safety, so after installation, a road test and diagnostics for potential errors in the ABS/ESP systems are recommended. For users who are simultaneously servicing other vehicle systems, a guide on selecting and maintaining thermal comfort components may be helpful – detailed information can be found in the article Air Conditioning and Heating – Part Selection and Maintenance for Year-Round Comfort.