Method 1: Backlash Test
1. Park the vehicle on a level surface and apply the parking brake.
2. Jack up the car and secure it on supports.
3. Grasp the top and bottom of the wheel and rock it vigorously from side to side.
4. Check for play or rolling in the bearing.
Method 2: Noise Test
1. Get into the car and drive at a speed of 40-50 km/h.
2. Listen for extraneous noise such as humming, grinding or vibration.
3. Try to determine which side of the car the sound is coming from.
4. When you hear the noise, check to see if it gets louder when you turn it in the same direction as the suspected bearing.
Method 3: Visual Inspection
1. Inspect the wheel bearing for signs of grease leakage, rust, or damage.
2. Spin the wheel by hand and check if it rotates smoothly and if there are any signs of binding.
Notes:
* For cars with an automatic transmission, it is not recommended to turn the wheels manually, as this may damage the transmission.
*If you notice play, noise or other signs of bearing failure, contact a mechanic for further diagnosis and repair.
*A faulty wheel bearing can cause serious damage, so it is important to replace it as soon as possible.