What condition leads to an all-wheel skid?

• A. Under-inflated tires
• B. Excessive braking
• C. Improper tire alignment
• D. Excessive acceleration

Answer: (B)

An all-wheel skid occurs when the vehicle loses traction on all four wheels, which can be a result of various factors that affect tire grip. Excessive braking is particularly significant because it can cause the wheels to lock up. When the brakes are applied too hard, this prevents the tires from maintaining their grip on the road surface, leading to a situation where all four wheels can skid simultaneously.

In scenarios of excessive braking, the weight transfer to the front wheels during deceleration can shift the vehicle's dynamics in such a way that tires lose traction, particularly if the road conditions are unfavorable (e.g., wet, icy, or uneven surfaces). This results in a loss of control as the vehicle continues to slide despite the brakes being applied.

In contrast, while under-inflated tires, improper tire alignment, and excessive acceleration can each contribute to various handling issues and traction loss, they do not necessarily lead to an all-wheel skid in the same direct manner as excessive braking does.