Mercedes W221 Brake Caliper Rear Left N/S Wheel Brake Unit S-Class A2214230381

Mercedes W221 Rear Left Brake Caliper is a factory-original brake system component from the Brake Calipers and Brackets group, designed for installation on the rear left axle of the vehicle. Its original design ensures proper pad guidance, stable mounting, and predictable braking characteristics, in line with Mercedes manufacturer standards.

Specifications and technical data

• SKU: A2214230381
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2214230381
• Substitutable numbers: A2214230381, A 221 423 03 81, BG
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Vehicle Application and Placement

The presented caliper is specifically designed as a component for the rear left axle. It is responsible for evenly pressing the brake pads against the disc, which translates to stable deceleration and correct brake system operation during daily use and more intense emergency braking.

Its dedicated placement on the vehicle minimizes the risk of incorrect installation, and the caliper's proper geometry supports an even distribution of braking forces between the right and left sides, which is important for both safety and the durability of other system components.

Technical Characteristics and Construction

As an original Mercedes part, the brake caliper is made from materials selected for their resistance to high temperatures, mechanical loads, and external factors. The caliper body provides adequate rigidity, which limits deformation during braking and promotes consistent piston operation.

The design solutions used in this caliper model support:

• stable guidance of brake pads in the caliper bracket,
• correct interaction with the rear brake disc,
• maintenance of appropriate pressure in the hydraulic circuit,
• precise operation in the rear-left position of the vehicle.

Benefits of Using an Original Mercedes Caliper

Using an original caliper for the W221 model allows for the preservation of factory braking parameters and compatibility with other system components. This solution is particularly beneficial for users who expect predictable vehicle behavior without the need for adaptations or modifications to the installation.

Key advantages include:

• factory fitment to the suspension geometry and rear axle braking system,
• compliance with braking assistance systems,
• reduced risk of uneven wear of pads and discs,
• easier diagnostics and servicing due to the use of a component that meets manufacturer specifications.

Condition, Verification, and Selection of a Used Caliper

This item is from the used parts segment, allowing for economical brake system repair while maintaining original construction. Before installation, standard workshop inspection is recommended, including assessment of piston operation, guide pin seats, and connection sealing, to ensure safe functioning in the specific vehicle.

If you wish to deepen your knowledge on safely choosing brake components from the aftermarket, a guide describing practical criteria for assessing component condition will be useful. You can find it in the article Used Brake System: How to Safely Choose Discs, Calipers, and ABS?.

Related Components and Further Brake System Expansion

When servicing the rear left caliper, it is advisable to simultaneously inspect other system components, such as the opposite caliper, caliper brackets, or mountings, to maintain consistent braking parameters across the entire axle. If you are planning a comprehensive service for your Mercedes and are also interested in other components from the same group, check the available parts in the Mercedes Brake Calipers and Brackets category.