What action helps restore brake efficiency after driving through water?

Gently pumping the brakes is the correct action to help restore brake efficiency after driving through water. When a vehicle drives through water, moisture can create a film on the brake components, leading to reduced effectiveness. By gently pumping the brakes, the friction generated helps to dry out the brake pads or shoes and the brake disc or drum surfaces. This action helps to restore the normal contact between the braking surfaces, thus improving overall braking response.

Pumping the brakes allows for a gradual build-up of friction, ensuring that they do not overheat and become ineffective, as might happen if they were applied too harshly. This method is particularly useful because it gives the driver better control over the braking force applied, enhancing safety until full brake performance is restored.