Tools You'll Need:
* New brake light switch: Ensure you get the correct replacement for your 1985 Impala. The part number might be helpful when ordering.
* Socket wrench: Likely a 7/16" or 11/16" socket, depending on the switch's mounting bolt.
* Phillips or flathead screwdriver: Might be needed to access the switch depending on the configuration under the dashboard.
* Wrench: Possibly a smaller wrench depending on your vehicle's configuration.
* Penetrating oil (optional): Helpful if the bolt is rusty or stuck.
Procedure (General Steps - Always consult a repair manual for your specific vehicle):
1. Disconnect the Battery: This is crucial to prevent accidental short circuits. Disconnect the negative (-) terminal first.
2. Locate the Brake Light Switch: This is typically found on the firewall, near the brake pedal. It's usually a small cylindrical switch with wires connected to it. You might need to partially remove some trim panels under the dashboard to get better access. A repair manual will show you the exact location.
3. Disconnect the Electrical Connectors: Carefully unplug the electrical connector(s) from the brake light switch. Take note of how they are connected for reassembly. Some switches might have two connectors, one for the brake lights and another for the cruise control (if equipped).
4. Remove the Switch: Carefully remove the bolt or retaining clip holding the brake light switch in place. Use penetrating oil if the bolt is stuck. The switch may be held in place by a single bolt.
5. Install the New Switch: Carefully install the new brake light switch, ensuring it's properly seated in its location. Secure it with the bolt or retaining clip.
6. Reconnect the Electrical Connectors: Reconnect the electrical connectors to the new switch, matching them to the way they were originally connected.
7. Reconnect the Battery: Reconnect the battery's negative (-) terminal.
8. Test the Brake Lights: Turn on the ignition and test the brake lights by gently pressing the brake pedal. They should illuminate correctly. If not, double-check your connections and the switch itself.
Important Notes:
* Consult a Repair Manual: A repair manual specific to your 1985 Chevrolet Impala is highly recommended. It will provide detailed diagrams and instructions that are specific to your vehicle's model and year. This will prevent potential damage or incorrect installation.
* Safety First: Always disconnect the battery before starting any electrical work.
* Bleeding the Brakes (Possible, but unlikely): In rare cases, replacing the brake light switch may require bleeding the brakes, but this is not common. Check your repair manual.
If you are uncomfortable performing this repair yourself, it's always best to consult a qualified mechanic. Improperly installed brake lights can be a serious safety hazard.
