Mercedes R171 W203 W209 Front Brake Disc Plate Left Right N/O/S Set A2034211312

Brake discs from the Mercedes R171 W203 W209 Front Brake Disc Plate Left Right N/O/S Set are original braking system components designed for installation on the front axle, on both the left and right sides. They ensure stable operating conditions for calipers and pads, which translates into predictable braking performance during daily use. This set allows for an economical, yet technically correct replacement of worn discs in Mercedes vehicles of the corresponding model series.

Specifications and technical data

• SKU: A2034211312
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2034211312
• Substitutable numbers: A2034211312, A 203 421 13 12
• Location on the vehicle: Front, Left, Right
• Part type: Brake Disc Rotor
• Category: Brake Disc Rotors

Purpose and vehicle placement

The presented set of discs is designed for operation on the front axle, intended for both the left and right sides. This solution enables a consistent replacement of both discs simultaneously, which is recommended for even distribution of braking forces and vehicle stability during heavy braking.

Being dedicated to specific models from the Mercedes R171, W203, and W209 family means that the disc geometry, working diameter, and construction have been adapted to the factory calipers and hubs of these vehicles. This ensures proper cooperation with the braking system and assistance systems such as ABS or ESP.

Technical characteristics and compatibility

The set of front brake discs has been developed as an original component, compliant with the vehicle manufacturer's factory specifications. The appropriately selected working thickness, friction surface, and mounting method to the hub ensure proper heat dissipation and stable friction under typical road conditions.

The OEM part designation and the availability of interchangeable numbers allow for precise verification of compatibility with a specific engine and equipment version of the car. Before purchasing, it is worth comparing the markings with the vehicle documentation or existing components to ensure that the discs will work correctly with the installed calipers and pads.

Condition, functional advantages, and installation

The offered set comes from the group of used Mercedes parts, which allows for reducing service costs while maintaining the original design of the component. For workshops and individual users, this means the ability to match discs to a specific model without the need to experiment with replacements of uncertain specifications.

Replacing discs on the front axle in pairs (left/right) promotes even pad wear and reduces the risk of steering wheel vibrations and differences in braking force between the sides of the vehicle. The design intended for a specific Mercedes platform facilitates installation – after properly preparing the hub and checking the calipers, the installation follows standard service procedures.

Safety and selection of used brake components

When choosing used brake discs, it is crucial to pay attention to their compatibility with the vehicle model, the condition of the friction surface, and the permissible wear values specified by the manufacturer. Properly selected discs, working with appropriate pads, contribute to a stable braking distance and predictable vehicle behavior in emergency situations.

If you want to verify step-by-step what to look for when buying used brake system components, check out our guide: Second-hand braking system – how to safely select discs, calipers, and ABS. This is a practical checklist that makes it easier to make an informed purchasing decision.

Expanding the braking system in a Mercedes

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 discs, pads, or brake lines, check out the available parts in the Mercedes brake discs category.