my Volvo XC90 makes a grinding noise when I brake, is this serious?

Solution

1. Preparation

• Tools Required: Socket set, jack and jack stands, brake cleaner, safety goggles, gloves.
• Ensure the vehicle is parked on a flat surface with the parking brake engaged.
• Disconnect the battery if working on electrical components.

2. Remove Wheels

1. Loosen the lug nuts on the front wheels using a socket wrench.
2. Jack up the vehicle and secure it with jack stands.
3. Remove the lug nuts and take off the front wheels.

3. Inspect Brake Components

1. Brake Pads:
   • Check the thickness of the brake pads. Replace if they are below 3mm.
   • Look for any uneven wear or damage.
2. Brake Rotors:
   • Inspect the rotors for grooves, scoring, and warping. Measure rotor thickness using a micrometer.
   • Resurface or replace if necessary.
3. Calipers:
   • Check for proper movement of the caliper pistons. Ensure they are not seized.
   • Inspect the caliper bracket for any damage or debris.

4. Replace Components (if necessary)

1. Brake Pads Replacement:
   • Remove the old brake pads from the caliper bracket.
   • Install new brake pads ensuring correct orientation and alignment.
2. Rotor Replacement:
   • If replacing rotors, remove the caliper and bracket.
   • Unbolt the rotor and replace with a new one. Ensure it is properly seated.
   • Torque the rotor bolts to the manufacturer's specifications.

5. Reassemble and Test

1. Reinstall the caliper and secure it with bolts.
2. Reattach the wheel and hand-tighten the lug nuts.
3. Lower the vehicle and torque the lug nuts to the manufacturer’s specifications.
4. Reconnect the battery if it was disconnected.