What percentage of braking should occur in a straight line before making a turn?

When approaching a turn in a fire service vehicle, it is essential to achieve maximum braking in a straight line before entering the turn for several reasons, which make selecting the correct percentage critical. By braking at least 90% before turning, the vehicle maintains optimal control and stability.

Applying a significant amount of braking while the vehicle is still traveling straight enables the driver to reduce speed effectively, which minimizes the chances of skidding or losing traction while negotiating the turn. The weight transfer that occurs during braking helps ensure that the vehicle remains stable and balanced rather than shifting too heavily to one side, which could lead to a rollover, particularly in larger fire service vehicles.

As for other percentages, 50% and 70% do not provide enough deceleration, increasing the risk of understeering or oversteering during the turn. Stopping altogether would not be practical in most situations where a quick response is needed, making it less applicable in emergency scenarios. Thus, engaging in maximum braking before a turn—aiming around 90%—ensures that the vehicle is prepared to handle the dynamics of steering at reduced speed, thus enhancing safety for both the operator and other road users.