how to fix BMW 3 Series F30/F31 (2012-2019) brake warning light on

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, brake fluid, multimeter, brake cleaner.
• Ensure the vehicle is parked on a level surface and the ignition is turned off.
• Disconnect the battery to prevent any electrical issues during repairs.

2. Check Brake Fluid Level

• Locate the brake fluid reservoir, usually found near the driver's side of the engine compartment.
• Open the reservoir cap and check the fluid level.
• If low, add the recommended brake fluid type (DOT 4 for most BMWs).

3. Inspect Brake Components

• Brake Pads and Rotors:
  • Remove the wheel using a socket set.
  • Inspect the brake pads for thickness; replace if less than 3mm.
  • Check rotors for scoring or grooves; replace if necessary.
• Brake Lines:
  • Examine the brake lines for any signs of leaks or wear.
  • Replace any damaged lines.

4. Test the Brake System

• If the issue persists, use a multimeter to check the brake pedal switch and ABS module for correct voltage and resistance.
• Replace any faulty components.

5. Reset the Brake Warning Light

• Reconnect the battery.
• Use the OBD-II scanner to clear any fault codes and reset the brake warning light.