my Volkswagen Golf MK7 (2015-2019) brake light is on but brakes are fine, what's wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect Brake Light Switch

• Locate the brake light switch behind the brake pedal.
• Sub-steps:
  • Remove the switch by unscrewing or unclipping it from its mount.
  • Use a multimeter to check for continuity when the brake pedal is pressed.
  • If the switch is faulty, replace it with a new one.
• Tools Required: Screwdriver, multimeter

3. Check Brake Fluid Level

• Locate the brake fluid reservoir under the hood.
• Sub-steps:
  • Remove the cap and check the fluid level against the markings on the reservoir.
  • If low, top off with the appropriate brake fluid (usually DOT 4) and check for leaks in the system.
• Tools Required: Funnel, brake fluid

4. Inspect ABS Module and Wiring

• Locate the ABS module, typically near the brake master cylinder.
• Sub-steps:
  • Visually inspect the wiring harness for signs of damage, corrosion, or loose connections.
  • Clean any corrosion found on connectors and ensure tight connections.
• Tools Required: Wire brush, dielectric grease

5. Replace Faulty Bulbs

• Access the rear light assembly where the brake light bulbs are housed.
• Sub-steps:
  • Remove the assembly or cover to gain access to the bulbs.
  • Test each bulb for continuity; replace any that are burnt out.
• Tools Required: Screwdriver