1. Check the Bulbs:
* Access: This is the easiest first step. Locate the brake light bulbs (usually in the taillights) and check if they're burnt out. Your Cavalier likely has two brake lights (one on each side). Replacement is relatively simple, though you might need a small socket wrench or screwdriver.
* Proper Bulb: Ensure you're using the correct type and wattage bulb. Consult your owner's manual or a parts store for the specifications. Using the wrong bulb can lead to premature failure or damage.
2. Check the Fuses:
* Locate the fuse box: Your owner's manual will show you the location of the fuse box (usually under the hood or dashboard).
* Identify the brake light fuse: The manual should also indicate which fuse is responsible for the brake lights. Check if it's blown (the internal wire will be broken). Replace it with a fuse of the same amperage. Do not replace with a higher amperage fuse.
3. Inspect the Wiring:
* Look for damage: Carefully examine the wiring harness leading to the taillights. Check for any fraying, corrosion, loose connections, or broken wires, particularly near the bulb sockets and where the wiring enters the vehicle body. Look for any signs of rodent damage too.
* Connections: Pay close attention to the connections at the bulb sockets and the main harness connectors. Clean any corrosion with a wire brush or electrical contact cleaner. Ensure the connections are secure and firmly plugged in.
4. Check the Brake Light Switch:
* Location: This switch is typically located near the brake pedal.
* Function: It's a small switch that closes when you press the brake pedal, completing the circuit to illuminate the brake lights.
* Testing: You might need a multimeter to test the switch's continuity (whether it's making a connection). If you're uncomfortable with electrical testing, take it to a mechanic. A faulty switch is a common cause of brake light problems.
5. Check the Brake Light Circuit:
* Professional Help: If you've checked everything above and the brake lights are still not working, it's time to seek professional help. A faulty ground wire, short circuit, or other more complex electrical problem might be at play. A mechanic can use specialized tools to diagnose the issue more accurately.
Important Safety Note: Driving with inoperable brake lights is incredibly dangerous. Do not drive the car until the problem is resolved. If you cannot safely fix the problem yourself, have it towed to a repair shop.
