The brake light switch is mounted on the brake pedal assembly in the driver’s footwell, just above the pedal on the pedal bracket. It’s a small rectangular sensor that the brake pedal depresses to activate the stop lights.
Location and appearance
To identify it, look up into the driver’s side footwell where the brake pedal pivots. The switch sits on the brake pedal bracket near the firewall and is actuated by the pedal’s movement. Here are the key cues to recognize it:
- Mounted to the brake pedal bracket, typically above and behind the pedal arm
- Rectangular or slightly rectangular plastic/metal housing with a push-rod or plunger
- Electrical connector with two or more wires feeding the brake lights (and sometimes other systems)
- Often adjustable via a small screw or slot on the switch body
In operation, pressing the brake pedal pushes the plunger and closes the circuit to illuminate the brake lights. When the pedal is released, the plunger returns and the lights turn off.
How to check or replace the switch
If your brake lights aren’t working or stay on, the switch is a common culprit. The following steps outline how to inspect and replace it if necessary.
- Park safely, turn the ignition off, and locate the switch in the driver’s footwell above the brake pedal
- Disconnect the electrical connector from the switch to inspect for corrosion or damaged wires
- Check the plunger for sticking or excessive travel; gently depress and release to feel for a clean, smooth action
- With ignition on (do not press the pedal), test continuity or use a test light as you manually simulate pedal movement
- If faulty, remove the mounting bolts, replace with an OEM or equivalent brake light switch, and reinstall; recheck alignment so the pedal fully depresses the switch
Note: Some repairs require removing trim panels or knee bolts to access the switch more easily. If you’re unsure or uncomfortable with ignition-powered testing, consult a qualified mechanic.
Additional tips and considerations
After replacement, ensure the brake lights illuminate when you depress the pedal and that they turn off when released. If brake lights still misbehave, check the fuse, bulbs, and wiring harness for issues that could affect the lighting circuit.
Summary
The brake light switch on a 2017 Hyundai Elantra is located on the brake pedal assembly in the driver’s footwell, attached to the pedal bracket and activated by pedal movement. It’s a small, typically rectangular switch with a plunger and an electrical connector. If brake lights misbehave, inspect the switch and its wiring, test continuity, and replace if necessary, consulting a professional if the process feels beyond your comfort level.