When and why replace Your Vehicle Timing Belt! It is more cost-effective and safe to replace your car’s timing belt for preventive reasons rather than waiting until it breaks. In fact, it can cost more than double the price to have your timing belt replaced after it breaks. Needless to say, it’s best to be proactive with vehicle service. The importance of Replacing Timing Belt at 60,000 to 100,000 miles. most manufacturers recommend you have your vehicle’s timing belt replaced every 60,000 to 10