What is considered the most critical safety service for a late-model vehicle?

The most critical safety service for a late-model vehicle is brake pad replacement. This is primarily because the braking system is fundamental to vehicle safety. The brakes are responsible for reducing speed and stopping the vehicle effectively. If the brake pads are worn out or compromised, their effectiveness diminishes, which can lead to longer stopping distances, reduced control, and an increased risk of accidents.

In contrast, while an oil change, tire rotation, and battery check are all important maintenance tasks, they do not directly affect the vehicle's ability to stop safely. An oil change ensures proper engine lubrication and function; tire rotation helps with tire wear and performance but does not directly influence stopping power; and a battery check ensures the vehicle starts and electrical components function but does not contribute to immediate safety while driving. Thus, maintaining the braking system, particularly through brake pad replacement, is crucial for ensuring the overall safety of a vehicle.