my Volvo XC90's brake warning light is on what should I check

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and engage the parking brake.
• Disconnect the battery to prevent electrical issues while working on the brake system.

2. Check Brake Fluid Level

• Open the hood and locate the master cylinder reservoir.
• If the fluid is low, top it up with the manufacturer-recommended brake fluid (DOT 4 for most models).
• Inspect for visible leaks around the master cylinder and brake lines.

3. Inspect Brake Pads and Rotors

• Remove the wheel using a lug wrench.
• Check the brake pads for thickness; they should be at least 3mm thick.
• If they are worn down, replace them.
• Inspect the rotors for scoring or warping; machine or replace as necessary.

4. Examine Brake Lines

• Inspect all visible brake lines for cracks, corrosion, or leaks.
• Replace any damaged brake lines using appropriate replacement parts.
• Ensure all connections are tight and secure.

5. Reconnect Battery and Test

• Reconnect the battery and start the vehicle.
• Press the brake pedal to ensure it feels firm and responsive.
• Monitor the brake warning light; it should turn off if repairs are successful.