Mercedes W204 Brake Caliper Rear Right O/S Wheel Brake Unit A2044231881

Mercedes W204 Brake Caliper Rear Right O/S Wheel Brake Unit is an original brake system component designed for the rear axle on the driver's side. Thanks to its factory origin from the Mercedes brand, it ensures a precise fit to the hub, brake disc, and pads, as well as compliance with the braking system performance parameters specified for this model.

Specifications and technical data

• SKU: A2044231881-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2044231881
• Substitutable numbers: A2044231881, A 204 423 18 81, A2044230106, A 204 423 01 06, BG
• Location on the vehicle: Rear, Right
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is designed for installation on the rear right side of vehicles from the Mercedes W204 family. The placement on the vehicle is crucial for the proper operation of the braking system – the body design, the arrangement of connection ports, and the pad guidance are optimized specifically for this mounting position.

Thanks to its dedicated design, the caliper works with the appropriate brake disc and pads, which allows for maintaining even distribution of braking forces between the left and right sides of the rear axle. This, in turn, translates into vehicle stability during braking, especially in emergency situations.

Construction and functional operation of the caliper

The rear right brake caliper in the Mercedes W204 is responsible for converting brake fluid pressure into the clamping force of the pads against the disc. The caliper body, guide pins, and piston have been designed to ensure repeatable, linear operating movement and adequate rigidity of the entire assembly.

The main tasks of this component include:

• stable guidance of brake pads relative to the disc,
• maintaining proper clamping force during braking,
• ensuring the return of the piston after releasing the brake pedal,
• maintaining the tightness of the hydraulic system within the wheel area.

A properly selected caliper reduces the risk of the vehicle pulling to one side, disc overheating, or uneven pad wear, which has a direct impact on driving safety and comfort.

Benefits of using an original Mercedes caliper

Using an original Mercedes brake caliper allows you to maintain the operating parameters of the system as intended by the vehicle manufacturer. This means:

• secure fit to the steering knuckle and hub without the need for modifications,
• compliance with the factory geometry of the braking system,
• predictable behavior during braking across the full load range.

An item from the Brake calipers and brackets category, coming from the same production line as the factory vehicle equipment, facilitates service and diagnostics, and minimizes the risk of problems resulting from the use of unsuitable replacements.

Characteristics of the used product

The offered brake caliper is a used component, which in practice means it has been removed from a vehicle but retains the functionality required for further operation after proper installation and potential servicing. In the case of hydraulic brake system components, it is recommended to verify the condition of seals, guide pins, and working surfaces each time before installation in the vehicle.

Choosing a used caliper is a solution that allows you to reduce repair costs while maintaining compliance with the original manufacturer's specifications. This is particularly beneficial in situations where you want to maintain component consistency throughout the entire braking system.

Selection, compatibility, and technical support

To correctly select the rear right brake caliper for a specific version of the Mercedes W204, it is worth verifying compatibility with the OEM part number and interchangeable numbers indicated in the technical specification. This helps avoid installation problems and ensures full compatibility with the existing disc, pads, and brake line.

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, brackets, or mounting holders, check the available parts in the Mercedes Brake calipers and brackets category.

When selecting used brake system components – including discs, calipers, and ABS system parts – it is worth following a proven verification procedure. A detailed list of steps to pay attention to when purchasing such parts can be found in the article: Second-hand braking system: how to safely select discs, calipers, and ABS?.