Mercedes W166 Brake Caliper Rear Right O/S Braking Unit A1664230281

Mercedes W166 Brake Caliper Rear Right O/S Braking Unit is an original braking system component designed for installation on the rear right axle of vehicles in this series. Thanks to its factory design, it ensures precise brake pad guidance, stable pressure on the brake disc, and predictable vehicle behavior during braking. It is a practical solution for users who want to maintain consistency with factory specifications and ensure even operation of the rear axle.

Specifications and technical data

• SKU: A1664230281
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1664230281
• Substitutable numbers: A1664230281, A 166 423 02 81
• Location on the vehicle: Rear, Right
• Category: Calipers & Brackets

Purpose and compatibility with the braking system

The presented caliper has been designed specifically for operation on the rear right side of the Mercedes W166 series vehicle. It is responsible for the stable guidance of brake pads and the even distribution of braking force onto the disc, which has a direct impact on the car's behavior during deceleration and emergency braking. Using an original caliper in this position allows for maintaining consistent braking characteristics between the left and right sides of the axle.

Construction and operating characteristics

The caliper belongs to the Brake Calipers and Brackets category, meaning it is responsible for both generating clamping force and providing stable mounting within the steering knuckle, as well as working with the carrier and brake pads. The design intended for the rear axle accounts for specific loads and brake force distribution, ensuring the component operates in a repeatable and predictable manner under typical road conditions.

The original manufacturing ensures proper guide geometry, correct positioning of mounting points, and compatibility with factory-fitted accompanying components such as discs, pads, or brake lines. As a result, the caliper can be integrated into the existing system without the need for structural modifications.

Benefits of using the original rear right caliper

Using this component in a Mercedes vehicle's braking system provides a number of practical operational benefits:

• maintaining factory braking characteristics on the rear axle,
• consistent operation with assistance systems such as ABS or ESP (assuming they are present in the vehicle),
• proper fitment with standard brake discs and pads,
• appropriate distribution of forces within the mounts and guides.

For the user, this means stable, repeatable braking system performance and a reduction in the risk of uneven wear of pads or discs on the right side of the rear axle. Choosing an original caliper is particularly important in vehicles where predictable behavior during braking on wet surfaces, in corners, and under full load is essential.

Condition, origin, and service application

The component comes from the Mercedes brand and is intended for re-installation in vehicles of this series where replacement of the rear right caliper is necessary due to wear, corrosion, or mechanical damage. It can be used both as part of a standard brake system repair and during comprehensive rear axle maintenance, including the replacement of pads, discs, and mounting hardware.

It is always worth verifying the selection of the correct caliper for a specific vehicle version based on catalog data and the car's technical specifications to ensure full compliance with the factory braking system configuration.

Expanding brake system service and auxiliary materials

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 Brackets category.

When selecting used braking system components, it is worth using reliable technical materials. Practical tips on assessing the condition of calipers, discs, and related components can be found in the article "Second-hand braking system: how to safely choose discs, calipers, and ABS?", which serves as a helpful checklist when planning service and purchases in this parts group.