Ans: Yes, pad thickness can be measured without removing the wheel. You can often visually inspect the brake pads through the wheel spokes or use a flashlight to check the thickness if there's adequate visibility. Some vehicles may also have inspection holes on the calipers, allowing you to assess pad thickness without taking off the wheel. However, for a more precise measurement, especially if you suspect uneven wear, it's advisable to use a brake pad thickness gauge or consult a professional mechanic.