What is the recommended action when brake pressure is lost on a heavy trailer?

When brake pressure is lost on a heavy trailer, applying the handbrake gradually is the recommended action. This method allows for controlled deceleration without causing a sudden loss of control that could occur if the brakes were applied too quickly or forcefully. The handbrake engages the trailer's brakes and can help to slow down the vehicle safely, allowing the driver to manage the situation more effectively.

Gradually applying the handbrake also helps to avoid skidding, which can happen if the brakes are locked up suddenly. In a heavy trailer, maintaining stability and control is crucial, so a smooth, gradual application is the best choice. This action enables the driver to assess the surroundings and bring the vehicle to a stop in a safer manner, which is particularly important in emergency situations.