What is brake lag?

Brake lag refers to the delay experienced between the moment the driver applies the brake and the time when the brakes actually begin to engage and slow down the vehicle. This lag can be crucial to understand, especially for a tractor-trailer, given its size and weight.

When a driver steps on the brake pedal, it doesn't initiate braking immediately due to several factors, including the distance the hydraulic fluid must travel and the response time of the braking system. In larger vehicles, this lag can be more pronounced due to additional weight and braking system complexity, making it vital for drivers to anticipate this delay to maintain safe stopping distances. Recognizing and accounting for brake lag is essential for safe operation, particularly in emergencies or when navigating downhill slopes where prompt braking may be critical.

Understanding brake lag helps drivers improve their reaction times and overall safety while operating heavy-duty vehicles, emphasizing the importance of defensive driving practices in managing stopping distances effectively.