What is a car rear bumper with holes
The small round holes on the rear bumper of a car mainly have two functions:
Ranging radar
The small round holes located at both ends of the rear bumper (such as the corners of Volkswagen models) are usually millimeter-wave radars, which are used to detect the distance of obstacles, vehicle speed and the surrounding environment, and support adaptive cruise control and blind spot detection functions.
Trailer hook machine cover
The small round hole in the center position is mostly the cover of the tow hook. After prying it open, the tow hook can be installed for towing and rescue in case of vehicle failure. For instance, the trailer holes of models like Trumpchi also have this function.
The small round holes on some models may also have ventilation functions, but their main uses are still for ranging radar or towing.
The small round holes on the rear bumper of a car mainly have the following two functions:
Ranging radar
The small round holes located on both sides of the rear bumper are usually distance measurement radars, which measure the distance between the vehicle body and obstacles through ultrasonic or millimeter-wave technology. They are mainly used for:
Youdaoplaceholder0 speed measurement : The speed of the vehicle is obtained by calculating the rotational speed of the wheels.
Youdaoplaceholder0 Obstacle detection : Detect the surrounding environment when visibility is low to avoid accidents.
Youdaoplaceholder0 adaptive cruise control : Maintain a safe distance from the vehicle in front.
Some models (such as Volkswagen) also have radar blind spot detection functions to assist in safe lane changes.
Trailer hook machine cover
The small circular hole in the center position (similar in size to a matchbox) is usually the trailer hook cover and is used for:
When a vehicle breaks down, it serves as a fixed towing point and a tow hook is installed to achieve rescue.
The trailer holes of some models (such as the Trumpchi) can also detect objects behind when reversing.
These designs take into account both driving safety and emergency rescue needs. The specific functions need to be determined in combination with the vehicle model configuration.
When there is a hole fault in the rear bumper of a car, the repair or replacement plan should be selected based on the size of the hole and the degree of damage:
Repair plan
If the hole is small and does not cause structural deformation, a repair kit can be used for self-repair.
Youdaoplaceholder0 Cleaning treatment : Wash the damaged area with soapy water to ensure that the surface is free of dust and oil stains.
Youdaoplaceholder0 Smooth out : Use sandpaper to smooth the rough surface to enhance the adhesion of the filling material.
Youdaoplaceholder0 Filling and repair : Use a dedicated filler (such as AB glue) to fill the hole. After it dries, sand it with sandpaper until it is flush with the surrounding area.
Youdaoplaceholder0 Paint repair : Paint to match the color of the bumper, apply multiple coats and let them dry before proceeding to the next layer.
Replacement suggestions
If the hole is large or the bumper is severely deformed, a new bumper needs to be replaced to ensure safety.
Choose a bumper that matches the vehicle model. When replacing it, it is recommended to have it done by a professional maintenance person.
Abnormal hole investigation
If there is suspicion of human damage (such as drilling holes for installing a reversing camera), you can check whether the hole position affects the safety function. If necessary, contact the 4S store or a professional institution for appraisal.
The repair plan for the damaged rear bumper hole of a car should be selected based on the degree of damage:
Repair of minor damage
If the hole is small and does not affect structural safety, a repair kit can be used for self-repair.
Youdaoplaceholder0 Cleaning treatment : Wash the damaged area with soapy water, remove impurities and then dry it.
Youdaoplaceholder0 Polish the base : Use sandpaper to polish the rough surface to enhance the adhesion of the filling material.
Youdaoplaceholder0 Filling and repair : Use AB glue or special filler to fill the holes, and after it dries, sand it smooth.
Youdaoplaceholder0 Spray painting repair : Apply the topcoat that matches the bumper color multiple times, and finally polish the fusion edge.
Treatment of severe damage
If the hole is large or accompanied by deformation or cracking, it is recommended to replace the bumper for safety.
Youdaoplaceholder0 assess structural safety : if damage affects the rigidity of the vehicle body or poses safety hazards, it must be replaced.
Youdaoplaceholder0 Replacement process : Contact the insurance company for damage assessment, choose a regular repair shop for replacement and painting. Usually, the vehicle can be picked up the next day.
When self-repairing, pay attention to the matching degree of materials and the fineness of the craftsmanship; otherwise, it is easy to cause color differences or secondary damage.
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