Final answer:
The braking distance for air brakes is longer than hydraulic brakes because of brake lag.
Step-by-step explanation:
The braking distance for air brakes is longer than hydraulic brakes because of brake lag. Brake lag refers to the delay between the moment the brakes are applied and the moment they actually engage and start slowing down the vehicle. This delay is typically longer for air brakes due to the time it takes for the compressed air to reach and activate the brake system.