you should replace your CV boot if it is cracked asap

easy to check dude. if you know its from the front right go take the wheel off and see if anythign is amiss... a broken CV boot will start to spray thick grease EVERYWEHRE.

its the rubber boot that covers the joint (forget the correct term).... imagine if all the greasy fell out..... no lubricant AND grease all over your rim..... bad scene esp if you're going on aroad trip.

i wouldn't imagint it POPing tho...