Mercedes W212 Brake Caliper Rear Wheel Brake Unit Right O/S A2124230181

Mercedes W212 Brake Caliper Rear Wheel Brake Unit Right O/S is an original braking system component from the Brake calipers and carriers group, designed for installation on the rear right axle of the vehicle. Thanks to its factory origin, it ensures a proper fit to the braking system design, stable piston operation, and predictable braking performance. This is a solution for users looking for a proven, used component with maintained mounting geometry.

Specifications and technical data

• SKU: A2124230181
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2124230181
• Substitutable numbers: A2124230181, A 212 423 01 81
• Location on the vehicle: Rear, Right
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper has been designed specifically for the rear right side of Mercedes W212 series vehicles. It is responsible for evenly pressing the brake pads against the disc on this side of the axle, which has a direct impact on the stability of the vehicle's path during braking and the effectiveness of the entire system.

Thanks to its precisely selected placement on the vehicle, the caliper works with the factory brake master cylinder, lines, and other system components, minimizing the risk of uneven wear of pads and discs.

Construction and performance parameters

The original brake caliper for the Mercedes W212 is characterized by a solid, metal construction adapted to work in demanding operating conditions. The housing provides adequate rigidity, which limits deformation under high operating pressures and promotes stable pad pressure.

The internal geometry of the guides and piston seats has been factory-matched to the manufacturer's specifications, which facilitates the correct operation of the mechanism and improves the repeatability of braking force. This type of solution is particularly important in premium class vehicles, where a predictable response of the braking system is expected across the full range of loads.

Benefits of using an original, used caliper

Using an original, used brake caliper in a Mercedes W212 allows you to combine cost control with maintaining the factory operating parameters of the system. Compared to replacements of unknown origin, such a component offers:

• factory fit to the hub, carrier, and brake disc,
• compliance with the original braking force characteristics on the rear axle,
• serviceability (e.g., replacement of seals, guides, pads) in accordance with the manufacturer's procedures,
• reduction of the risk of assembly problems resulting from dimensional differences.

For workshops and individual users, this means more predictable assembly and a lower risk of needing to intervene in the braking system again after a short period of use.

Application in service practice

Replacing the rear right brake caliper in a Mercedes W212 is a typical service operation performed for symptoms such as one-sided wheel heating, uneven pad wear, or a drop in braking efficiency. The original component from the Brake calipers and carriers group allows for restoring the correct operation of the system without the need for installation modifications.

In assembly practice, it is important to follow the appropriate bleeding procedure and check the condition of the disc and pads on the other side of the axle to ensure even operation of both rear calipers. Choosing a component from Mercedes helps maintain the consistency of braking parameters with the vehicle manufacturer's assumptions.

Braking system expansion and selection of other elements

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

To better understand how to safely use original, used braking system components and how they can help reduce service costs without sacrificing safety, it is worth reading the guide: Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing proven recycled parts.

Summary

Mercedes W212 Brake Caliper Rear Wheel Brake Unit Right O/S is an original component designed for operation on the rear right axle, which allows for restoring proper braking efficiency and maintaining the factory characteristics of the system. Solid construction, fitment to Mercedes specifications, and the possibility of further servicing make it a practical choice for drivers and workshops looking for a used, yet technically predictable solution.