Brake Booster Mercedes CLA C118 Coupe Petrol OM282 Master Cylinder Reservoir

Brake Booster Mercedes CLA C118 Coupe Petrol OM282 Master Cylinder Reservoir is a precision brake system component, designed by Mercedes to ensure stable, predictable, and comfortable braking force modulation. This used part from the Brake Boosters and Proportioning Valves category allows for professional repair or restoration of factory-standard system performance in vehicles with a petrol engine.

Specifications and technical data

• SKU: rhd-A1774308100
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1774304400
• Substitutable numbers: A1774308100, A 177 430 81 00, A1774304400, A 177 430 44 00, A1774305600, A 177 430 56 00
• Fuel type: Petrol
• Category: Brake Servos

Purpose and function in the braking system

The presented brake booster integrated with the master cylinder and fluid reservoir is responsible for amplifying the pressure applied to the brake pedal and providing stable hydraulic supply to the brake circuits. In combination with a petrol engine, it ensures proper utilization of vacuum, which translates into:

• more predictable vehicle response to brake pedal input,
• reduction in the force the driver must apply for effective braking,
• maintenance of proper circuit pressure during sudden and emergency stops.

Thanks to its factory design dedicated to the CLA C118 with a petrol engine, this component works with other braking system parts in accordance with the manufacturer's specifications.

Construction and fitment for Mercedes CLA C118

The brake booster with master cylinder and reservoir has been designed as an original Mercedes braking system component, which means maintaining the correct geometry, mounting points, and hydraulic and vacuum connections. In practice, this translates into:

• easier installation in place of the factory booster without the need for modifications,
• correct alignment relative to the brake pedal and the engine bay bulkhead,
• compatibility with brake lines and the vehicle's installation.

Such fitment is particularly important in modern models, where the braking system interacts with safety systems, and an improper booster can affect the operation of control electronics.

Benefits of using an original brake booster

Choosing an original brake booster with master cylinder and reservoir for the CLA C118 brings a number of practical service and operational benefits. The most important include:

• maintaining factory brake pedal characteristics – travel, firmness, and response remain close to the manufacturer's settings,
• consistency with the ABS/ESP system, which has been calibrated for a specific type of booster and master cylinder,
• reduced risk of leaks thanks to proper fitting of ports and threads,
• the possibility of professional brake system repair without compromising safety.

A used part from this group allows for an economical yet technically sound replacement, especially in the event of a damaged booster diaphragm, master cylinder leaks, or issues with the fluid reservoir.

Application in petrol vehicles

The presented brake booster is intended for petrol-engined cars, which is significant for how vacuum is generated and utilized in the system. Proper matching to the fuel type affects:

• stable booster operation across the full engine RPM range,
• proper cooperation with vacuum control valves,
• reduction of the risk of decreased braking efficiency during dynamic driving.

As a result, the braking system maintains predictable parameters both in city traffic and at higher speeds.

Condition, verification, and operation of a used component

The offered brake booster with master cylinder and reservoir is a used part, which allows for lower repair costs while maintaining the original design. Before installation, it is recommended to:

• check the vacuum system and hydraulic connections for leaks,
• verify brake pedal operation after bleeding the system,
• check the condition of the brake fluid and replace it if necessary.

To maximize the trouble-free service life, it is worth using the appropriate brake fluid and regularly checking the level and visual condition of the medium in the reservoir.

If you want to better take care of the operation of dismantled parts, including the braking system, engine, or electronics, check out practical tips in the article How to extend the life of used car parts?, where you will find specific recommendations regarding maintenance and installation.

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other components from the same group, such as boosters, proportioning valves, or related hydraulic sub-assemblies, check out the available parts in the category Mercedes Brake Boosters and Proportioning Valves.