Brake Light Switch

Replace the brake light switch located above the brake pedal assembly to restore brake light functionality and ensure proper safety signal operation.

Warnings

Tools required

Parts

• Brake light switch × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and set parking brake
2. Turn ignition to OFF position and remove key
3. Open driver's door and position work light to illuminate area above brake pedal
4. Allow sufficient time for any residual electrical charge to dissipate (1-2 minutes)

Procedure

1. 1

   Access brake pedal area
   Position yourself in the driver's footwell with adequate lighting. Locate the brake light switch mounted on the bracket above the brake pedal arm. The switch will have an electrical connector and a plunger that contacts the brake pedal or pedal arm. On the 2005 Viper, access is tight due to the performance pedal box design; you may need to adjust the steering column to its lowest and most forward position for better access.
2. 2

   Disconnect electrical connector
   Locate the wiring harness connector on the brake light switch body. Press the locking tab or release mechanism on the connector (typically a squeeze-tab design on this platform) and pull the connector straight off the switch. Do not pull on the wires themselves. If the connector is difficult to access, use needle-nose pliers to gently squeeze the release tab while pulling.
3. 3

   Remove brake light switch
   The switch is retained in the mounting bracket by a quarter-turn/bayonet-style mount typical of Chrysler platforms of this era. Verify the exact retention method against the 2005 Viper factory service manual before applying force: many Chrysler switches rotate approximately 30 degrees to release, but confirm rotation direction and locking design for your specific switch. Note the orientation and position of the switch plunger relative to the brake pedal arm for installation reference.nd position of the switch plunger relative to the brake pedal arm for installation reference.
   ℹ️The exact retention method for this model year may be twist-lock or push-tab. Examine the switch body carefully before applying force to avoid breaking plastic retaining tabs.
4. 4

   Inspect mounting bracket and pedal contact point
   With the switch removed, inspect the mounting bracket for cracks or damage. Check the brake pedal arm where the switch plunger makes contact for wear, smoothness, or debris. Clean any dirt or debris from the bracket and contact point with a clean cloth. Verify that the brake pedal returns fully to its rest position with no binding.
5. 5

   Install new brake light switch
   Insert the new switch into the mounting bracket, aligning it in the same orientation as the original. For twist-lock type: push the switch fully into the bracket and rotate clockwise approximately 30 degrees until it locks in place with a click. For push-tab type: push the switch straight into the bracket until the retaining tabs click into place. Ensure the switch is fully seated and secure in the bracket with no movement or play.
   ⚠Do not force the switch. Incorrect alignment or excessive force will break the retaining mechanism.
6. 6

   Adjust switch position
   The brake light switch on this platform is self-adjusting and sets its position when installed. With the brake pedal at rest (fully released), the pedal or pedal arm holds the switch plunger in the depressed (pushed-in) position; when the pedal is pressed the plunger extends and the switch activates the brake lights. Verify the correct plunger relationship against the factory service manual and switch instructions before finalizing. If self-adjusting, the switch ratchets to the correct set position during installation against the pedal.witch packaging or instructions if included. The switch should click or ratchet during this adjustment process if it is self-adjusting type.
   ℹ️Improper adjustment is the most common cause of brake light switch malfunction. Take care to ensure proper plunger engagement.
7. 7

   Reconnect electrical connector
   Push the wiring harness connector firmly onto the new switch terminals until you hear or feel a positive click, indicating the locking tab has engaged. Gently tug on the connector (not the wires) to verify it is securely locked in place.
8. 8

   Test brake light operation
   Without starting the engine, turn the ignition key to the ON or ACC position to power the electrical system. Have an assistant observe the rear brake lights, or use a mirror/camera, or observe the reflection of brake lights on a wall or garage door behind the vehicle. Press and release the brake pedal several times. Brake lights should illuminate immediately when pedal is depressed and extinguish immediately when pedal is released. Verify both left and right brake lights function. Also verify that the center high-mount stop light (CHMSL) functions if equipped.
   ⚠️If brake lights do not function correctly, DO NOT drive the vehicle. Re-check switch installation, adjustment, and electrical connection. Seek professional service if issue persists.

Reassembly

1. No disassembly beyond switch removal was required for this procedure
2. Return steering column to normal driving position if it was adjusted for access
3. Clear any tools or materials from driver's footwell before operating vehicle

Verification

• With ignition ON, press brake pedal and verify all brake lights illuminate (left, right, and center high-mount)
• Release brake pedal fully and verify all brake lights extinguish completely with no delay
• Verify brake lights do not remain illuminated with pedal fully released
• Verify cruise control disengages when brake pedal is pressed (if equipped) - this confirms proper switch signal to vehicle systems
• Test brake lights again after a short test drive to ensure switch has not shifted or loosened
• If vehicle is equipped with push-button start or brake-to-start interlock, verify engine will start normally

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