In recent months, global searches for terms like "how do robotaxis brake" or "autonomous taxi safety" have increased by 150%. With new players entering the market and the global expansion of Waymo and Baidu, the question naturally arises: how does a driverless car ensure it stops under all conditions?

What is a Robotaxi and why is its braking different?

A Robotaxi is a Level 4 or 5 (SAE J3016) autonomous electric vehicle. Unlike traditional cars, these vehicles have no pedals or direct mechanical connections between the cabin and the wheels. Braking is entirely managed through Brake-by-Wire technology.

For a Robotaxi, braking is not just a mechanical act of slowing down but a complex operation of data management. While in a traditional car the system is designed to respond to a human command (often imperfect), in a Robotaxi, braking is designed for systemic optimization.

 

Here are the 3 main features that make Robotaxi braking radically different:

 

1. "Anthropomorphic" Braking (Motion Sickness Management)

In a traditional car, braking is often irregular: the human driver continuously adjusts the pressure on the pedal. In a Robotaxi, braking must be hyper-smooth to enhance comfort.

  • Why it’s different: When a person has no control over the vehicle and is not looking at the road (but perhaps at a tablet), they are much more prone to motion sickness.
  • The solution: The system (like Brembo SENSIFY) uses algorithms to eliminate "pitching" (the nose dive of the car). Deceleration is not a sudden peak but a calculated curve to keep the passenger’s body stable, replicating or improving the smoothness of a professional driver.

2. "Beyond the Horizon" Deceleration (V2X and Foresight)

A traditional car brakes in response to what the driver sees ahead (reactivity). A Robotaxi brakes in response to what will happen further ahead.

  • Why it’s different: Thanks to V2X (Vehicle-to-Everything) connectivity and long-range sensors, the Robotaxi knows that a traffic light will turn red or that there’s a slowdown behind a blind curve.
  • The solution: Braking is predictive. The vehicle starts to slow down with minimal and almost imperceptible braking torque long before a human would. This not only increases safety but also preserves the friction materials of the brake pads and drastically reduces the thermal stress on the discs.

3. "Fail-Operational" Redundancy (No Human Backup)

In a traditional car, the backup for the braking system is the driver: if the brake booster fails, the driver presses the pedal harder. In a Robotaxi (often pedal-less), the backup must be integrated into the system itself.

  • Why it’s different: The system must be capable of instant self-diagnosis. If a component fails, the vehicle cannot simply stop braking.
  • The solution: The architecture is redundant. While a normal car has a single main hydraulic circuit, the Robotaxi uses Brake-by-Wire systems with two control units and four separate electrical networks. If one part of the system "dies," the other continues to brake (Fail-Degraded mode), ensuring the vehicle always stops under any condition.

Market leaders: USA and China compared

The autonomous mobility sector is currently led by two technological hubs utilizing cutting-edge braking architectures:

  • Waymo (Jaguar I-PACE & Zeekr): The American leader employs dual hardware redundancy certified to operate in complex urban environments. Source: Waymo Safety Report

     

  • Baidu Apollo RT6 (China): The world's first Robotaxi designed without a steering wheel, equipped with triple braking system redundancy to ensure "Zero-Failure." Source: Apollo.auto

 

The Brembo SENSIFY revolution for Robotaxis

Brembo has responded to this evolution with SENSIFY, the intelligent braking ecosystem that integrates software and data. For Robotaxi service providers, SENSIFY addresses three critical issues:

  1. Increased safety: Unlike traditional braking systems that apply the same pressure to all four wheels, SENSIFY continuously monitors and controls the braking action on each wheel independently, quickly, and more precisely. This ensures shorter braking distances, passenger comfort, and safety for everyone, both on board and on the road.

     

  2. Elimination of Nausea (User Experience): One of the biggest obstacles to the adoption of Robotaxis is "motion sickness," or car sickness. Brembo's digital management enables such smooth deceleration that it eliminates car pitching, turning the cabin into a true mobile lounge.

     

  3. Sustainability and Predictive Maintenance:
    • Zero leaks: The Brake-by-Wire architecture eliminates hydraulic circuits, simplifying fleet maintenance.
    • Efficiency: Native integration with regenerative braking to extend battery range.