If the brake lights remain on continuously while driving, a following driver may not know when your brakes have been applied, and a rear-end crash could occur without prior warning. This condition may also discharge the vehicle's battery, and, the automatic transmission torque converter clutch, cruise control and traction control system, if equipped, will become disabled.
On certain passenger vehicles, the brake light switch may become misadjusted if an upward/rearward force is applied to the brake pedal. If this should occur, the brake light switch will not function properly, causing the brake lights, including the high mounted stop lamp, to remain illuminated continuously without brake pedal application, with the ignition switch in the on or off position.
