What happens if you apply the brakes too hard in an air brake system?

Applying the brakes too hard in an air brake system can indeed cause wheel lock-up, which leads to a loss of control over the vehicle. When brake pressure is applied too aggressively, especially on slippery surfaces, the wheels can stop turning altogether while the vehicle is still in motion. This can result in skidding, making it difficult for the driver to steer and regain control. Maintaining proper braking technique by applying the brakes smoothly and progressively helps to avoid this dangerous situation, ensuring better traction and control while coming to a stop.