One of the worst things that could happen to your car is having the timing belts break. This can happen very suddenly and often without any warning if you've been missing out on a regular service or timing belt replacement. When the timing belts break while you're driving, the camshaft and crankshaft will no longer be synchronized. Now moving separately, the crankshaft will continue to spin rapidly. Yet, the camshaft is fully stopped or is slowing down. All the while, the crankshaft will continue to force the pistons to rise or fall in quick succession. In many instances, they will strike the intake and exhaust valves with such high impact, that it'll cause irreparable and costly internal damage.