The Mercedes-Benz Electronic Parking Brake (EPB) control module shown in the image serves as the central control unit for the vehicle's electronic parking brake system. 

Location

The physical location of the control module within the vehicle is typically in the rear of the car. For compatible models like the Mercedes A-Class (W176), B-Class (W246), CLA (C117), and GLA (X156), it is often found in the cargo area's back left side, sometimes near the spare tire, behind a protective shield or interior paneling. 

Functions

This module (Part No. A 246 900 34 17) replaces traditional mechanical handbrake systems with an electronically controlled mechanism that offers several advanced features: 

Engaging and Releasing the Brakes: The core function is to control electric motors at the rear brake calipers to apply the brake pads, keeping the vehicle stationary when parked. It does this when the driver operates a button or switch, usually located on the dashboard or center console.

Automatic Release: The control unit can automatically release the parking brake when certain conditions are met, such as when the driver shifts into drive or reverse and presses the accelerator pedal.

Safety Features: It integrates with the vehicle's computer system to offer additional safety features:

Hill-Hold Assist (Hill Start Assist): Prevents the vehicle from rolling backward when starting on an incline by temporarily holding the brakes until the driver accelerates.

Emergency Braking: In an emergency situation, the system can provide dynamic braking if the parking brake switch is operated while the vehicle is in motion.

Automatic Engagement: The brake may automatically engage if the driver's seatbelt is unfastened and the door is opened while the car is running, or if the vehicle is switched off. 

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