my Volvo XC90 makes a grinding noise when I press the brakes, what's wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure vehicle is parked on a level surface and secured with wheel chocks.
• Disconnect the battery to ensure safety while working on the electrical components.

2. Remove Wheel

• Use a socket set to loosen the lug nuts slightly before lifting the vehicle.
• Lift the vehicle using a jack and secure it with jack stands.
• Remove the wheel completely.

3. Inspect and Replace Brake Pads

• Remove the caliper bolts using the appropriate socket size.
• Carefully slide the caliper off the rotor and suspend it using a bungee cord or similar tool to avoid damaging the brake line.
• Remove the old brake pads from the caliper bracket.
• Check the caliper for any corrosion or damage, and replace if necessary.
• Install new brake pads, ensuring they are positioned correctly.

4. Inspect and Replace Brake Rotors

• If the rotors are scored or below the minimum thickness, they should be replaced.
• Remove the rotor from the hub by unscrewing the retaining screws (if present) or sliding it off.
• Clean the hub surface with a wire brush to ensure proper mounting of the new rotor.
• Install the new rotor, ensuring it is seated properly.

5. Reassemble Brake Components

• Reattach the caliper over the new brake pads and rotor.
• Tighten caliper bolts to manufacturer's specified torque (check repair manual for exact value).
• Reinstall the wheel and hand-tighten the lug nuts.

6. Lower Vehicle and Final Checks

• Lower the vehicle from the jack stands.
• Tighten lug nuts to the correct torque specification in a crisscross pattern.
• Reconnect the battery.

Tools Required:

• Socket set
• Torque wrench
• Jack and jack stands
• Brake cleaner
• Bungee cord or wire to suspend the caliper

Parts Required:

• New brake pads
• New brake rotors (if necessary)
• Brake fluid (if topping off)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Always wear safety glasses and gloves when working on brake components.
• Allow the brake system to cool before working on it to avoid burns.