Audi A4 B8 Brake Caliper Electric Motor Left Right N/O/S Servo Unit 8K0998281

Description

The Audi A4 B8 Brake Caliper Electric Motor is a precision servo module designed to operate the parking brake in the rear calipers. This component, from the Brake Calipers & Brackets category, ensures stable operation of the electric parking brake, supporting safe vehicle stopping and proper integration with the car’s electronics.

Specifications and technical data

• SKU: 8K0998281
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0998281
• Substitutable numbers: 8K0998281, 8K0 998 281
• Location on the vehicle: Right, Left
• Category: Calipers & Brackets

Application and Function in the Braking System

The Audi A4 B8 Brake Caliper Electric Motor Left Right N/O/S Servo Unit is responsible for the electric drive of the parking brake mechanism within the caliper. Upon receiving a signal from the control unit, it activates the gearbox in the caliper, pressing the pads against the disc or releasing them. A properly functioning motor:

• ensures even brake application on both sides of the axle,
• maintains stable pressure in the caliper mechanism when stationary,
• integrates with vehicle safety systems such as hill start assist or auto-hold functions (if present in the specific configuration).

Construction and Vehicle Placement

The electric motor is designed as a module mounted directly onto the brake caliper body. The design allows for use on both the right and left sides, simplifying the selection of the correct component for rear axle servicing. The servo module housing is prepared for underbody conditions, accounting for exposure to moisture, dirt, and temperature changes.

Thanks to its factory-matched mounting geometry and electrical connectors, the component is ready for installation in place of the original motor, without the need for wiring modifications or adapters. This solution ensures correct positioning relative to the caliper mechanism and proper engagement with the threaded drive spindle.

Benefits of Using an Original Caliper Motor

Choosing an original parking brake servo module for an Audi translates into a number of practical advantages in daily operation:

• Vehicle Electronics Compatibility – the motor’s correct operating parameters facilitate adaptation within the parking brake controller and minimize the risk of system errors.
• Stable Parking Brake Operation – appropriately selected torque and drive characteristics support even application and release of the caliper.
• Replication of Factory Assembly – maintaining the original design concept reduces stress on the brake lines, connectors, and caliper body.

Condition, Verification, and Part Selection

The offered brake caliper electric motor is a used part, allowing for economical repair of the braking system while maintaining the original design specifications. Before installation, standard servicing procedures are recommended: checking the wiring harness, connectors, caliper seals, and performing parking brake adaptation using an appropriate diagnostic tester.

If you need a wider selection in this parts category, check out other Audi Brake Calipers & Brackets available in our assortment: Audi Brake Calipers & Brackets.

Technical Support and Knowledge of Used Brake Components

When selecting used braking system components – such as servo modules, calipers, or control elements – it is crucial to pay attention to structural compatibility and the correct installation procedure. If you want to go through the process of safely selecting used parts step-by-step, consult our practical guide: Used braking systems – how to safely choose discs, calipers, and ABS.