What is BRK on Airbus A320? (Brake)

The braking system plays a crucial role in the safe operation of an aircraft. It allows pilots to slow down, stop, and maintain control during landing and taxiing. The Airbus A320, a popular narrow-body aircraft widely used by airlines around the world, is equipped with a highly efficient and advanced braking system to ensure the utmost safety and reliability. In this article, we will delve into the details of the braking system on the Airbus A320, its components, functionalities, and the meticulous engineering behind it.

The Components of the Airbus A320 Brake System

The brake system on the Airbus A320 consists of several critical components that work together seamlessly to provide reliable stopping power. Let’s take a closer look at each of these components:

1. Brake Units

At the heart of the Airbus A320 braking system are the brake units. The A320 is equipped with carbon brakes, which offer numerous advantages over traditional steel brakes, such as reduced weight, improved performance, and longer life span. Each main landing gear of the aircraft is fitted with a brake unit consisting of multiple carbon brake discs and a brake actuator.

When the pilot applies the brakes, hydraulic pressure is directed to the brake units, activating the brake actuator. The actuator, in turn, applies pressure to the carbon brake discs, creating the necessary friction to slow down or stop the aircraft. The carbon material used in these discs allows for efficient heat dissipation, preventing overheating and ensuring optimal braking performance.

2. Brake Control System

The brake control system on the Airbus A320 is responsible for translating the pilot’s commands into specific actions that control the braking function. It consists of several essential components, including the brake pedals, brake control unit, brake metering valves, and brake pedals feel unit.

The brake pedals, located in the cockpit, allow the pilots to manually apply and modulate the braking force. These inputs are then transmitted to the brake control unit, which processes the signals and adjusts the brake pressure accordingly. The brake metering valves regulate the hydraulic pressure delivered to the brake actuators based on the pilot’s command, ensuring a smooth and controlled deceleration.

The brake pedals feel unit provides haptic feedback to the pilots, allowing them to sense the braking forces applied. This tactile feedback enhances the pilots’ situational awareness and enables them to make accurate judgments about the aircraft’s braking conditions.

3. Anti-Skid System

To prevent the wheels from locking up or skidding during braking, the Airbus A320 is equipped with an anti-skid system. This system constantly monitors the rotational speed of each wheel and selectively modulates the brake pressure to prevent wheel lockup. By automatically adjusting the brake pressure, the anti-skid system ensures that the aircraft maintains optimal braking efficiency and directional control.

The anti-skid system incorporates wheel speed sensors, electronic control units (ECUs), and hydraulic pressure control valves. The wheel speed sensors detect any discrepancies in wheel rotation, sending signals to the ECUs. The ECUs then analyze the data and determine the appropriate brake pressure needed for each wheel. The hydraulic pressure control valves then modulate the brake pressure accordingly, preventing wheel lockup and allowing optimal braking performance.

Brake System Operation and Safety Features

The brake system on the Airbus A320 is meticulously designed and engineered to ensure safe and reliable operation in various conditions. Here are some key aspects of brake system operation and the safety features incorporated:

1. Brake Temperature Monitoring

Brake overheating can compromise braking effectiveness, increase wear and tear, and even lead to catastrophic brake failure. To prevent these issues, the Airbus A320 employs a brake temperature monitoring system. This system constantly measures the temperature of the brake discs and provides real-time information to the pilots and maintenance crew.

If the brake temperature exceeds a certain threshold, the pilots are alerted, and appropriate actions can be taken, such as reducing braking intensity or allowing the brakes to cool down before further operations. This proactive temperature monitoring ensures that the brakes remain within their operational limits and significantly enhances safety.

2. Brake Parachute Systems

In the event of an emergency landing or a rejected takeoff, the Airbus A320 is equipped with an additional safety measure known as the brake parachute system. This system comprises of a chute located at the aft of the aircraft, which can be deployed to provide additional drag during deceleration.

The brake parachute system enhances the aircraft’s braking performance, reducing the reliance on the main braking system. It allows for shorter stopping distances, especially in cases where the runway length is limited, and enhances the crew’s ability to bring the aircraft to a safe stop.

3. Anti-Skid Override

In rare instances where the anti-skid system malfunctions or becomes inactive, the Airbus A320 is equipped with an anti-skid override feature. This feature allows the pilots to manually regulate the brake pressure and prevent wheel lockup through mechanical means.

The anti-skid override ensures that pilots always have the ability to modulate the braking forces and maintain control of the aircraft, even in the absence of the automated anti-skid system. This redundancy adds an extra layer of safety and ensures that the braking capabilities of the aircraft are not compromised.


The brake system on the Airbus A320 is a critical and highly sophisticated component that plays a vital role in ensuring the safe operation of the aircraft. From the carbon brakes to the anti-skid system and various safety features, every aspect of the braking system is designed to provide precise and reliable stopping power.

The continuous development and innovation in brake technology contribute to enhanced efficiency, reduced maintenance requirements, and improved passenger safety. The brake system on the Airbus A320 not only facilitates smooth landings and taxiing but also instills confidence among pilots and passengers alike.

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