Mercedes r172 Brake Disc Set Rear Left Right Wheel N/O/S Perforated Braking Unit

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes r172 Brake Disc Set Rear Left Right Wheel N/O/S Perforated Braking Unit is a set of original Mercedes braking system components, designed for the rear axle, for both the left and right sides. The perforated design of the discs supports stable brake performance, and the set format facilitates consistent replacement of both sides in a single service operation. This is a solution for users looking for technically matched brake discs for a specific model from the R172 family.

Specifications and technical data

• SKU: A1724230112
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1724230112
• Substitutable numbers: A1724230112, A 172 423 01 12
• Location on the vehicle: Rear, Right, Left
• Category: Brake Disc Rotors

Purpose and rear axle fitment

The presented set includes discs mounted on the rear axle, on the right and left sides. The placement on the vehicle has been factory-defined for this reference, which promotes correct positioning relative to the calipers and hubs. As a result, the proper geometry of the braking system is maintained, and the installation process in the workshop is predictable and repeatable.

A complete approach to replacing both discs on the rear axle limits the differences in wear between the sides, which translates into more stable vehicle behavior during braking, especially at higher speeds and in emergency situations.

Perforated design and operating characteristics

The discs in the set belong to the Brake discs category and feature a perforated working surface. The holes in the disc support the dissipation of gases and dust generated during intensive braking, which helps maintain a more repeatable friction coefficient between the pad and the disc. This type of design is particularly valued in high-performance cars, where the braking system operates across a wider temperature range.

Perforation can also promote faster removal of moisture from the working surface after starting in the rain, which improves the initial "bite" of the brake after a long period of inactivity. The use of original hole geometry and appropriately selected disc material thickness allows for the right compromise between braking efficiency and component durability.

Characteristics of the used product

The offered set of brake discs is a used item, sourced from a Mercedes vehicle. Such OEM components are often chosen by users who want to maintain the factory operating characteristics of the braking system while optimizing service costs. In practice, this means maintaining the original material and design specifications, which is important for precise vehicle handling and predictable brake operation.

Before installation, a standard workshop procedure is recommended: inspection of the working surface, measurement of run-out, and verification of the minimum permissible thickness in accordance with the service documentation of the specific model. This approach allows you to fully utilize the potential of the set and ensure safe operation.

Integration with the Mercedes braking system

The discs have been designed as braking system components dedicated to the Mercedes R172 platform, which promotes compatibility with factory calipers, hubs, and assistance systems such as ABS or ESP. Proper dimensional and structural matching is crucial for even pad pressure, correct distribution of braking forces, and reduction of vibrations transmitted to the body.

Replacing discs on the rear axle should always be combined with an assessment of the condition of the brake pads and mounting elements. A consistent service approach helps maintain stable braking characteristics and reduces the risk of uneven wear on new components.

Service expansion and educational 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 discs, pads, or brake lines, check the available parts in the Mercedes brake discs category.

When selecting elements from the secondary market, it is worth using reliable sources of knowledge. Practical tips on assessing the condition of components, safety criteria, and how to verify their origin can be found in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?, which serves as a useful checklist when purchasing used brake parts.

For drivers comparing different service strategies, material describing the cost-to-quality ratio for new and used OEM parts may also be helpful. A detailed summary of the advantages and limitations of both solutions can be found in the guide New or used? A comparison of costs and quality of car parts, which will facilitate an informed purchasing decision.