1. Warped brake rotors: This is the most common cause of shaking in the steering wheel when braking. Warped rotors can occur due to uneven wear or overheating.
2. Loose or damaged suspension components: Loose or damaged ball joints, tie rods, or control arm bushings can also cause the steering wheel to shake.
3. Improper wheel alignment: Incorrect wheel alignment can put extra stress on the suspension and cause the steering wheel to shake.
4. Flat or underinflated tires: Flat or underinflated tires can also cause the steering wheel to shake when braking, especially at highway speeds.
5. Faulty brake calipers: Faulty brake calipers can cause the brake pads to apply unevenly, which can lead to shaking.
6. Faulty wheel bearings: Faulty wheel bearings can also cause the steering wheel to shake, especially when turning or braking.
What to do:
1. Inspect the brake rotors. If the rotors are warped, they will need to be replaced.
2. Check the suspension components. Look for any loose or damaged components and have them replaced as necessary.
3. Have the wheel alignment checked. If the wheel alignment is incorrect, it will need to be corrected.
4. Inflate the tires. Ensure the tires are properly inflated to the recommended pressure.
5. Have the brake calipers checked. If the brake calipers are faulty, they will need to be replaced.
6. Have the wheel bearings checked. If the wheel bearings are faulty, they will need to be replaced.