Mercedes SLK R172 Brake Pedal Box Assembly Unit A1722900218

The Mercedes SLK R172 brake pedal assembly is a factory-fitment module designed for vehicles equipped with an automatic transmission. This is a complete, used brake pedal unit, specifically engineered for the braking control system design of the R172 generation SLK, ensuring correct geometry, travel, and compatibility with factory equipment.

Specifications and technical data

• SKU: rhd-A1722900218
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1722900218
• Substitutable numbers: A1722900218, A 172 290 02 18
• Gearbox type: Automatic
• Category: Pedal Assemblies, Pads & Parts

Purpose and Brake System Compatibility

The presented brake pedal assembly is a component from the Pedals, Pedal Covers, and Footrests group, dedicated to the Mercedes SLK R172 body style. The module's construction has been developed to work in conjunction with the factory brake booster, sensors, and control electronics, which helps maintain the correct pedal force and travel characteristics in cars with automatic transmissions.

Properly matched mounting points to the vehicle body and the correct pedal position relative to the driver's seat and steering column translate to predictable, repeatable brake performance and comfortable ergonomics for everyday use.

Brake Pedal Module Construction

The brake pedal assembly in the Mercedes SLK R172 features a rigid, load-bearing structure that integrates:

• a mounting bracket for the vehicle's bulkhead,
• a pedal arm with optimized length and kinematics,
• a connection point to the brake assist system,
• factory-designated locations for electrical components and sensors.

This design ensures stable pedal guidance, limits unwanted flex, and allows for proper force transfer between the driver's foot and the braking system. As a result, the vehicle's response to pedal pressure remains consistent with the manufacturer's original specifications.

Benefits of Using an Original Brake Pedal Assembly

Using an original brake pedal assembly in the Mercedes SLK R172 offers a number of practical advantages:

• Factory Fitment – maintains the correct pedal position, travel, and operating characteristics in line with the manufacturer's design.
• Automatic Transmission Compatibility – the module's construction is adapted to the control system and pedal layout of automatic versions.
• Stable Brake System Operation – a rigid mounting base limits play and unwanted vibrations during braking.
• Simplified Installation – factory-intended mounting points and geometry matching the R172 body reduce replacement time.

Choosing such a component is particularly important for repairs after collisions, replacing a damaged module, or restoring full brake system functionality in intensively used vehicles.

Item Condition and Service Application

The offered brake pedal assembly is a used part, sourced from disassembly, which allows for economical repair while maintaining original design specifications. This type of component is particularly useful in situations where the pedal mounting has suffered mechanical damage, the arm is deformed, or wear exceeds permissible operational limits.

Replacing the complete module instead of repairing individual components often reduces service time and minimizes the risk of brake system malfunction, which directly impacts driving safety.

If you are planning a comprehensive repair or upgrade of the brake control area in your Mercedes and need other parts from the same group, such as pedal covers, complete pedal assemblies, or driver's footrests, check the available parts in the Mercedes Pedals, Pedal Covers, and Footrests category.

For drivers interested in a broader perspective on powertrain component operation and assessing the condition of used drivetrain parts, the guide: Second-hand Differentials – What You Should Know About Used Differentials, Sensors, and Drive Systems may be helpful, demonstrating how to approach purchasing parts from the aftermarket with informed decisions.