These CV joint boots are so vital as they stop dirt, water and other harmful materials from entering into the constant velocity (CV) joints. The boot material can also wear faster due to external oil and grease thus it is good to wash the boots with soap and water. Therefore, inspect for tears, cracks or loose clamps in the boots. Using your hand flex the CV joint boots to check for cracks or leaking grease. In case one notices any signs of cracks or lubricants seeping through, they should be replaced right away.