Which of the following actions should NOT be performed when a driver sees a "CHECK BRAKES" sign?

When a driver sees a "CHECK BRAKES" sign, it indicates a potential issue with the braking system that requires immediate attention. Ignoring the sign completely is not advisable, as this could lead to unsafe driving conditions and possible brake failure, which poses a serious risk to the driver and other road users.

On the other hand, gently pressing the brake pedal can help the driver assess the current braking performance, which might indicate whether the brakes are functioning properly or if there is a noticeable issue, such as a lack of responsiveness. Consulting a mechanic is a critical action to take after noticing the sign, as professional evaluation and necessary repairs can ensure the safety of the vehicle. Thus, ignoring the warning sign does not just compromise safety but also goes against best practices for vehicle maintenance and responsible driving.