Replace the brake light switch on a 2024 Tesla Model 3 Performance. The switch is mounted on the brake pedal bracket above the driver's footwell and is a plug-in/clip-in component requiring no special tools.

Warnings

Tools required

Parts

• Brake light switch (manufacturer-specified replacement for 2024 Model 3) × 1 — OEM Tesla brake pedal position/light switch — order by VIN

Preparation

1. Park on level ground, place in P, and engage the parking brake.
2. Exit ALL doors with the key fob/phone key away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize, even on this non-HV job.
3. Disconnect the 12V low-voltage battery. On 2024 Model 3, this is typically the lithium 12V/16V unit — refer to architecture notes and the in-vehicle service mode location for your specific build.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
5. If at any point you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Move the driver's seat fully rearward and tilt the steering column up for footwell access.
7. Verify the replacement switch matches the original by part number/VIN before removing the old one.

Procedure

1. 1

   Access the brake pedal area
   Lie on your back in the driver's footwell with a headlamp. Locate the brake pedal arm and follow it upward to the pedal bracket where the brake light switch is mounted (typically a small cylindrical or rectangular switch clipped into the bracket with a 2- to 4-pin connector).
2. 2

   Remove lower trim if needed
   If the lower knee bolster or driver-side dash under-panel obstructs access, release its plastic clips with a trim tool and set it aside. Disconnect any wiring (e.g., footwell light) before fully removing. Do not yank — Model 3 trim clips are brittle.
   ⚠Aluminum/plastic hybrid trim — pry only at clip locations, not on painted or decorative surfaces.
3. 3

   Disconnect the switch electrical connector
   Press the connector release tab and pull the harness connector straight off the brake light switch. Inspect the connector pins for corrosion, push-back, or melting — replace pin terminals if damaged before installing the new switch.
4. 4

   Remove the old brake light switch
   Most Tesla brake light switches are a quarter-turn or push-and-clip retention into the pedal bracket. While holding the brake pedal stable, rotate or release the switch per the manufacturer-specified retention method and withdraw it from the bracket. Note the orientation of the plunger relative to the pedal arm tab before removal.
   ⚠Do not depress the brake pedal repeatedly with the 12V disconnected and switch removed — this can disturb the iBooster pedal position calibration.
5. 5

   Inspect the pedal bracket and striker tab
   Check the pedal bracket bore and the pedal arm striker tab for cracks, deformation, or wear. The Model 3 pedal assembly is structural — any deformation requires a pedal assembly replacement, not just a switch swap.
6. 6

   Install the new brake light switch
   Pre-set the plunger per the manufacturer's instructions (some Tesla switches are self-adjusting on first pedal press; others require a fixed pre-load). Insert the switch into the bracket bore in the same orientation as the original and engage the retention feature (twist-lock or clip) until fully seated. Verify zero free play between the switch plunger and the pedal striker tab.
   ℹ️If the switch is self-adjusting, do NOT press the brake pedal until after installation is complete — the first press sets the zero point.
7. 7

   Reconnect the harness connector
   Push the connector onto the new switch until the locking tab clicks. Give a light tug to confirm full engagement. Route the harness so it does not contact the moving pedal arm.
8. 8

   Reinstall trim
   Reconnect any trim wiring (footwell light, etc.) and press the lower knee bolster / under-dash trim back into place until all clips seat. Confirm no harness is pinched.

Reassembly

1. Reconnect the 12V low-voltage battery and torque its terminal hardware to OEM specification — refer to Tesla Service Manual.
2. Close all doors, allow the vehicle to fully boot (touchscreen up, drive systems initialized — typically 1-2 minutes).
3. Press the brake pedal firmly several times to allow any self-adjusting switch to set its zero point and to wake the iBooster.

Verification

• With the vehicle awake, have an assistant confirm both rear brake lights and the high-mount stop lamp illuminate the moment the pedal is pressed and extinguish immediately on release.
• Confirm the vehicle will shift out of P (Park requires a valid brake-pressed signal on Model 3 — if it won't shift, the switch signal is not reaching the VCFRONT/chassis controller).
• Confirm Autopilot/TACC can be engaged and that pressing the brake disengages it cleanly — this validates the brake switch input to the ADAS stack.
• Check the touchscreen Service menu / alerts for any active brake pedal position or BSM (brake switch monitor) DTCs. Clear any stored codes with a compatible scan tool if present.
• Test-drive at low speed and confirm regenerative braking blends normally and brake lights activate during regen-only deceleration as expected for this build.
• Note: while you are in this area, verify brake fluid service interval — Tesla recommends brake fluid replacement every 2 years regardless of mileage.

More procedures for this vehicle