Some cautious drivers might have the habit of keeping their left foot on the brake pedal, rather than on the footrest, ready to use it instantly if needed. However, constantly engaging the brakes, especially while the engine is running, can lead to unnecessary wear and tear on the brake pads and rotors or drums. This can reduce the brakes’ effectiveness and possibly lead to sudden brake failure while driving, requiring more frequent visits to the mechanic or even causing an accident.