What Causes Rear Bumper Cracking?
2 Answers
Here are detailed explanations on how to prevent bumper cracking: 1. Summer: During summer, car bumpers are prone to spontaneous cracking. If cracking occurs, it can only be replaced at a maintenance shop. 2. Daily Care: Pay special attention when washing the car. Although the outer paint is wrapped with stainless steel components, it is still vulnerable to damage from wind, frost, rain, and snow. It is best to handle the bumper appropriately during car washing by using alkaline reagents to wipe it down, preventing rust and thus mitigating cracking. 3. Weather Impact: Weather conditions can cause internal rusting, leading to quality degradation and eventual cracking. Avoid driving through puddles or parking in areas with intense sunlight during daily use.
I have a lot to say about the causes of rear bumper cracking, as I've experienced similar issues with several cars I've owned. The most common cause is minor collisions, such as accidentally hitting an obstacle while reversing or being rear-ended, which can instantly cause cracks. Material aging is another major factor, especially in areas with strong UV exposure. Plastic bumpers become very brittle after prolonged exposure to sun and rain, and they are more prone to cracking in cold winter weather due to contraction. My old car's rear bumper split open with a large crack during a cold snap after five years of use, and the mechanic told me it was due to plastic degradation. Design flaws can also occasionally be the culprit, as some cars have gaps in the bumper installation, leading to stress concentration and cracking under vibration. I recommend everyone to inspect their bumpers regularly after parking and use adhesive to repair small cracks early to prevent them from becoming safety hazards.
