Trucking General KnowledgePractice Test

When a driver experiences brake failure, the most effective response is to downshift and use the emergency brake to slow down gradually. This method allows the driver to maintain some control over the vehicle while using the engine to help reduce speed, which is crucial in a situation where traditional braking is not functioning.

By downshifting, the driver engages a lower gear, which can cause the engine to rev higher and provide more engine braking. This can help to reduce velocity without relying solely on the brakes. Using the emergency brake, also known as the parking brake, provides an additional means to decelerate the vehicle safely. It is important to apply the emergency brake gradually to avoid locking the rear wheels, which could lead to loss of control.

In contrast, options such as accelerating to gain control or making a hard turn could lead to dangerous situations, losing control of the vehicle or creating a risk for a collision. Shifting to neutral is typically not advisable in this scenario, as it removes direct control over the vehicle's speed and handling. The combination of downshifting and using the emergency brake is a strategic and safer approach when braking is compromised.