Brake Caliper Mercedes W209 Rear Right Wheel O/S Braking Unit 42/20

Brake Caliper Mercedes W209 Rear Right Wheel O/S Braking Unit is an original braking system component designed for the right side of the rear axle. Thanks to its factory design, it ensures precise cooperation with the brake disc and pads, stable piston operation, and predictable braking characteristics in accordance with the manufacturer's standards. It is a practical solution for drivers who want to maintain consistent braking performance with other axle components.

Specifications and technical data

• SKU: A0044233298
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0044233298
• Substitutable numbers: A0044233298, A 004 423 32 98
• Location on the vehicle: Rear, Right
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented brake caliper is dedicated to the rear right side of the Mercedes W209 class vehicle. It is responsible for evenly pressing the pads against the disc on the outer side of the axle, which has a direct impact on driving stability during braking and the correct operation of assistance systems such as ABS or ESP. Proper placement on the vehicle minimizes the risk of uneven wear of pads and discs and reduces vibrations during intensive braking.

Design and operating parameters

The Brake Caliper Mercedes W209 Rear Right Wheel O/S Braking Unit has been designed as a complete working unit, adapted to operate with the 42/20 system. The appropriate piston diameter and body geometry ensure repeatable clamping force, which translates into predictable deceleration and comfortable brake pedal modulation. Solid, factory construction limits body deflection under load, which improves braking force stability across the entire operating temperature range.

Benefits of using an original caliper

Using an original caliper in the braking system provides a number of practical benefits:

• maintaining the factory braking characteristics of the rear axle,
• secure fitment to the carrier, disc, and pads intended for the W209,
• reduced risk of issues with bleeding and piston operation,
• consistency of parameters with other braking system components.

Thanks to this, the braking system maintains predictable behavior both during daily use and in emergency situations, which is crucial for driving safety.

Component condition and service application

The offered brake caliper comes from the used parts group, which allows for economical repair of the braking system while maintaining the original manufacturer's specifications. This type of component is particularly useful for:

• repairs after piston seizure or damage to connection threads,
• restoring system efficiency after corrosion of working elements,
• comprehensive rear axle service when discs and pads are also being replaced.

Choosing a used, original caliper allows you to reduce service costs while maintaining compliance with factory design assumptions.

More about used brake calipers

If you want to better understand how to safely select used braking system components and what to look for when purchasing, check out our guide: Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing verified recycled parts. The article explains why original, used calipers can be a reasonable service choice and how to evaluate their suitability for further use.

Related Mercedes brake calipers and carriers

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 brackets, check out the available parts in the Mercedes brake calipers and carriers category.