What condition must the brake pedal not exhibit when the vehicle is stopped?

When a vehicle is stopped, the brake pedal should not exhibit fading. Fading describes a reduction in braking effectiveness that often occurs after prolonged use of the brakes, particularly if the brakes are overheated or if there is moisture present. If the brake pedal fades while the vehicle is stopped, it indicates a serious issue within the braking system, such as problems with the brake fluid, brake pads, or the overall hydraulic system.

Other conditions, such as vibration, noise, and sticking, are also undesirable, but they relate to different specific mechanical concerns within the braking system. Vibrations could signal warped rotors, noise might indicate worn brake components, and sticking can be attributed to issues like rust or damaged components. However, fading is distinctly critical because it directly affects the vehicle’s ability to stop effectively, which is vital for safety. Thus, the absence of fading is essential for ensuring reliable braking.