Mercedes W204 Rear Brake Caliper Wheel Housing Left N/S A2044231781

Mercedes W204 Rear Brake Caliper Wheel Housing Left N/S is an original brake system component from the Brake calipers and carriers group, designed for installation on the rear left axle of the vehicle. This used OEM caliper ensures a precise fit to the suspension and hub design, which translates into stable brake pad guidance and predictable operation of the entire system. It is a solution for drivers who want to maintain the factory braking characteristics of their Mercedes without resorting to unreliable aftermarket replacements.

Specifications and technical data

• SKU: A2044231781-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2044231781
• Substitutable numbers: A2044231781, A 204 423 17 81, A2044230106, A 204 423 01 06
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is designed for operation on the rear left side of the vehicle, which is significant for both mounting geometry and brake line routing. Proper placement on the vehicle ensures correct alignment with the brake disc, even pad wear, and proper interaction with the hydraulic part of the system.

Selecting the correct caliper for the specific side and axle is crucial for maintaining balanced braking forces between the wheels, and thus for vehicle stability during heavy braking, including when driver assistance systems such as ABS or ESP are active.

Benefits of using an original Mercedes caliper

The original brake caliper dedicated to Mercedes provides:

• factory mounting points, which facilitates installation and eliminates the need for modifications,
• consistency with the design of the hub, disc, and pads intended for the specific model,
• stable pad guidance, reducing the risk of uneven lining wear,
• preservation of the braking characteristics intended by the vehicle manufacturer.

As a result, the brake system maintains predictable behavior, which has a direct impact on driving safety and the comfort of the driver and passengers.

Characteristics of the used product

The item is offered as a used part, which allows for reduced repair costs while maintaining the original manufacturer's specifications. In practice, this means the ability to replace a damaged or worn caliper with a component of the same geometry and operating parameters, without the risk of mismatch typical of some low-quality replacements.

Choosing a used OEM caliper is particularly beneficial for repairing vehicles that are used intensively, where both service economy and maintaining consistency with the factory brake system design are important.

Selection and compatibility in service practice

When selecting a caliper for the Mercedes W204, it is crucial to pay attention to the mounting side, model generation, and compatibility with the factory-fitted brake system. This caliper model is designed for use on the rear axle on the left side, which determines its construction, mounting arrangement, and brake line connection method.

To deepen your knowledge on the safe selection of brake system components from the secondary market, it is worth reading the guide: Second-hand brake system: how to safely choose discs, calipers, and ABS?. The article contains a practical checklist that helps assess the condition of used components and make an informed purchasing decision.

Expansion and service of the Mercedes brake system

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other elements from the same group, such as additional calipers, mounting brackets, or guide supports, check the available parts in the Mercedes brake calipers and carriers category.

Such an approach allows for consistent service of the entire axle – from calipers and brackets to other mounting elements – which minimizes the risk of subsequent play, uneven braking, or accelerated wear of cooperating components.