When your 2022 Kia Sportage's brake lights stay on continuously—even when you're not pressing the brake pedal—the problem drains your battery and confuses drivers behind you. The brake light switch is almost always the culprit.
Brake Light Switch Function
The brake light switch mounts near the brake pedal and activates when you press the brake. A plunger or button on the switch releases when the pedal moves, completing the circuit to illuminate brake lights. The switch should release the circuit when you release the pedal.
Why Lights Stay On
Brake lights stuck on typically means the switch is stuck in the activated position. This happens when the switch fails internally, the switch plunger is damaged or maladjusted, or the switch stopper pad has fallen off the pedal arm.
Stopper Pad Issue
A small stopper pad or bumper on the brake pedal arm holds the switch plunger in when the brake is released. If this pad deteriorates, falls off, or is missing, the plunger isn't pushed in, and lights stay on as if you're braking. This is a common and inexpensive fix.
Switch Failure
The switch itself can fail in the closed (on) position. Internal contacts that should open when the plunger is pushed remain closed. Switch replacement is required when this occurs.
Battery Drain Concern
Brake lights left on drain the battery quickly—usually in a few hours. If you discover lights stuck on, disconnect the battery or pull the brake light fuse to prevent drain until repair is possible.
Safety Note
The brake light switch also affects cruise control and push-button start systems. If those systems behave oddly after brake light issues begin, the switch is almost certainly the cause.