Brake Caliper Mercedes W203 Rear Left N/S Wheel Brake Unit 290/36 A0034239698

Brake Caliper Mercedes W203 Rear Left N/S Wheel Brake Unit 290/36 is an original braking system component designed for installation on the rear left axle of the vehicle. This used brake caliper from this series ensures stable operation of the braking mechanism while maintaining factory-fit compatibility with the suspension and hub design. It is a solution for drivers who want to maintain braking system consistency while optimizing service costs.

Specifications and technical data

• SKU: A0034239698-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0034239698
• Substitutable numbers: A0034239698, A 003 423 96 98
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and compatibility with the braking system

The presented caliper is a component from the Brake calipers and carriers group, dedicated to the rear left side of the vehicle. Its design is prepared to work with the appropriate brake disc and pads, allowing for the maintenance of uniform braking force between the sides of the axle. The vehicle placement is factory-defined, ensuring that installation is performed at the intended mounting points without the need for modifications. The original Mercedes origin ensures the preservation of the correct caliper geometry, proper pad guidance, and compatibility with the stock brake master cylinder and the ABS/ESP system of the given model. This is particularly important for the rear axle, where the stability of braking force affects the operation of vehicle stability control systems.

Construction and technical characteristics of the caliper

The rear left brake caliper in the 290/36 unit version has been designed as a robust working component that handles the thermal and mechanical loads generated during braking. The caliper body provides adequate rigidity, which limits deflection under high system pressure and promotes consistent pad-to-disc clamping force. Key design features of this type of caliper include:

• precise guidance of brake pads in the carrier,
• mounting points arranged for a specific model,
• adaptation for operation in the Mercedes vehicle hydraulic system,
• appropriate piston operating characteristics within typical working pressure ranges. As a result, the caliper maintains stable contact between the pad and the disc, which translates into predictable, linear brake pedal feel and repeatable deceleration during emergency braking and daily operation.

Benefits of using an original, used caliper

Choosing a used brake caliper for a Mercedes is a solution that allows you to combine cost control with the preservation of the factory system specifications. An original component from the same model platform ensures:

• dimensional compatibility with the hub, disc, and carrier,
• correct positioning relative to sensors and braking system accessories,
• easier installation compared to aftermarket parts with universal designs. For users who want to consciously manage their service budget while maintaining the original braking system configuration, such a caliper is a reasonable compromise between price and performance. More practical tips on selecting and operating refurbished and used brake components can be found in the article Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing proven recycled parts.

Installation zone: rear – left side of the vehicle

The placement of the caliper on the rear left axle is significant for both safety and the proper operation of the entire system. Correct selection of the installation side guarantees:

• proper positioning of the bleeder screw relative to the brake lines,
• compliance with the factory routing of flexible and rigid lines,
• maintenance of the manufacturer-intended braking force distribution characteristics between the axles. During replacement, it is recommended to install the caliper in pairs while checking the condition of cooperating components (discs, pads, lines) to achieve uniform operation on both sides of the axle and avoid differences in braking force.

Expanding the Mercedes braking system

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other components 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 why original used components of this brand are often chosen by informed users, it is also worth reading the guide Mercedes – comfort, prestige, and durability. Why is it worth choosing original used parts?, which discusses the practical aspects of operating and servicing Mercedes vehicles using salvaged parts.