Manoeuvre Emergency Braking and Towing: What Drivers Need to Know
Modern cars are packed with advanced safety systems designed to protect drivers, passengers, and other road users. One of the most important is Autonomous Emergency Braking (AEB), sometimes referred to as manoeuvre emergency braking when it operates at low speeds.¹
While this technology is extremely effective in everyday driving, towing a trailer or caravan can change how the system behaves. Understanding the interaction between manoeuvre emergency braking and towing helps prevent false alerts, unexpected braking, and unnecessary concern.²
What Is Manoeuvre Emergency Braking?
Manoeuvre emergency braking is part of a vehicle’s low-speed autonomous braking system. It typically operates during parking, reversing, or slow manoeuvring, using sensors to detect obstacles and automatically apply the brakes if a collision is predicted.¹³
Its purpose is to reduce low-speed impacts, protect pedestrians, and minimise vehicle damage.
How Manoeuvre Emergency Braking Works
At low speeds, the system monitors the area around the vehicle using radar, cameras, and ultrasonic sensors. If it determines the driver is not reacting quickly enough, it may apply partial or full braking without driver input.¹
This system is calibrated for normal vehicle operation without a trailer attached.²
How Towing Can Affect Emergency Braking Systems
When towing, several factors can influence how manoeuvre emergency braking behaves:
Additional Mass and Braking Response
A trailer increases the combined mass of the vehicle, affecting stopping distances and braking dynamics. Emergency braking systems may feel more abrupt or aggressive when towing.²⁴
False Obstacle Detection
During tight manoeuvres, vehicle sensors may detect:
- The trailer drawbar
- The trailer body during sharp turns
- Towbar or electrical components
This can cause the system to incorrectly interpret the trailer as an obstacle, triggering unexpected braking.³⁵
Reversing with a Trailer
Unexpected braking during reversing is a common experience when towing. Parking and manoeuvre sensors may not correctly interpret trailer movement unless the vehicle recognises a trailer connection.³
Interaction with Stability Systems
Emergency braking often works alongside Electronic Stability Control (ESC) and Trailer Stability Assist (TSA). If a vehicle is not correctly configured for towing, these systems may not function as intended.⁴
The Importance of Towbar Coding and Vehicle Recognition
On many modern vehicles, towbar installation requires software coding so the vehicle recognises that a trailer is attached. Correct integration allows the vehicle to:
- Adjust emergency braking behaviour
- Modify or limit parking sensor operation
- Enable trailer stability functions
- Prevent unnecessary braking interventions²⁴
Without proper coding, unexpected manoeuvre braking is more likely.
Should Emergency Braking Be Disabled When Towing?
Some manufacturers allow manoeuvre emergency braking or parking brake assist systems to be temporarily reduced or disabled when towing or reversing with a trailer. This should only be done in line with manufacturer guidance and never during normal road driving.¹²
Best Practices When Manoeuvring While Towing
To reduce unwanted emergency braking:
- Manoeuvre slowly and smoothly
- Avoid sharp steering inputs
- Ensure the towbar is vehicle-specific and correctly coded
- Keep sensors clean and unobstructed
- Familiarise yourself with vehicle towing settings³⁵
Final Thoughts
Manoeuvre emergency braking is a valuable safety feature, but towing introduces variables that can affect how it operates. With a properly installed and coded towbar, modern vehicles can adapt their safety systems to account for a trailer while maintaining safe, predictable behaviour.²⁴
If unexpected braking persists while towing, professional inspection of the towbar installation and vehicle integration is strongly recommended.
Best practice if you’re planning on getting a tow bar fitted is to check if your vehicle is equipped with Emergency Manoeuver Braking, and if so, discuss this with your professional tow bar installer before fitting.
References:
- European Commission, Advanced Emergency Braking Systems (AEBS), Mobility and Transport, European Union, available at: https://transport.ec.europa.eu [accessed 4 February 2026].
- Bosch, Driver Assistance Systems: Automatic Emergency Braking, Robert Bosch GmbH, available at: https://www.bosch-mobility.com [accessed 4 February 2026].
- Thatcham Research, Autonomous Emergency Braking and Low-Speed Manoeuvring Systems, Thatcham Research, available at: https://www.thatcham.org [accessed 4 February 2026].
- UNECE, Regulation No. 13-H: Braking of Passenger Cars, United Nations Economic Commission for Europe, available at: https://unece.org [accessed 4 February 2026].
- Vehicle manufacturers’ towing guidance, including Volkswagen Group and BMW Group, Trailer Recognition and Driver Assistance Systems, manufacturer technical documentation, accessed 2026.
