The function of installing brackets for cars
There are many types of brackets on cars. The "vehicle-mounted bracket" you mentioned usually refers to the car-mounted phone bracket and the roof luggage rack. There is also a type called the engine bracket, which is a vehicle component. The functions of these brackets vary greatly. I will explain them separately to you:
Car-mounted phone bracket: Makes using the phone while driving safer
This type of bracket is mainly used to fix the phone in the car. The main purposes are: to facilitate navigation viewing and to ensure safer phone usage when making calls.
Enhancing driving safety: Fixing the phone in a position that can be seen in the peripheral vision reduces the need to look down and frees your hands from the steering wheel, reducing the time when your eyes leave the road.
Relieving hands: It is more convenient to make calls and view the road conditions while driving, without having to hold the phone with one hand.
Stable fixation: In case of sudden braking or bumpy roads, the phone will not fly around, avoiding the dangerous action of dropping the phone into the seat and having to bend over to pick it up.
Adjustable angle: Most brackets support 360-degree rotation, allowing you to find the appropriate angle for viewing navigation in landscape mode or information in portrait mode.
The common types available on the market include suction cup type, air vent clamping type, magnetic type, and adhesive type. Each has its advantages and disadvantages. When choosing, focus on how well it is fixed, how smoothly the angle adjustment works, and whether it fits the interior of the car.
Roof luggage rack: Expands the loading space
This bracket is installed on the roof to fix large items. It is commonly used in SUVs and MPVs. Its main purpose is to expand the vehicle's loading capacity. Combined with roof boxes and roof frames, it can carry luggage, bicycles, and ski boards, etc.
Note: The loading height of the luggage rack from the roof must not exceed 0.5 meters. After installation, it is necessary to register with the vehicle management department and regularly check the tightness of the screws to avoid overloading.
Engine bracket: Vehicle component, not an external accessory
If you are asking about this, it belongs to the "shock absorber spring" of the engine. Its function is to fix the engine to the vehicle body and buffer the vibrations caused by the engine's operation to prevent the vibrations from directly reaching the vehicle.
Fixing the engine: Prevents the engine from moving during operation and avoids damaging the adjacent pipes and circuits.
Shock absorption and noise reduction: Rubber foot pads can absorb vibrations. If they are damaged, the car will shake and make abnormal noises.
Generally, rubber foot pads are recommended to be inspected and replaced every 7-10 thousand kilometers. Metal brackets are more durable.
Please provide a one-sentence summary.
To solve the problems of using mobile phones for navigation and making phone calls while driving → Choose a car-mounted phone holder. The key is to ensure it is securely installed and clearly visible.
To lift heavy objects → Pay attention to the roof luggage rack. Be aware of the regulations and load limits.
If the car idles and shakes, or makes abnormal noises → Check if the engine bracket is aging and needs replacement if necessary.
The installation of car brackets is a relatively broad concept, usually involving engine brackets (engine foot glue), brake pedal brackets, and body brackets such as the trunk/lights. Based on your location in Shanghai, I have summarized the most common fault manifestations, causes, and handling suggestions:
The most common fault: Aging or damage to the engine bracket (engine foot glue)
This is the most common problem encountered in daily driving, mainly manifested as:
Typical symptoms:
Obvious idle shaking: When waiting for a red light or shifting into D gear, the vehicle body, steering wheel, and seat experience periodic vibrations, even the brake pedal shakes.
Strong shift impact: When changing from P gear to D gear or R gear, the vehicle body has a noticeable jolt or "clunk" sound.
Swaying during acceleration or reverse: When driving at low speed with high torque, it feels like the car is bouncing up and down, especially when reversing.
Abnormal noise: A continuous low-frequency buzzing sound is emitted from the engine compartment, or rubber friction sounds occur when accelerating.
More prominent during cold start: The symptoms may be alleviated after the vehicle warms up, but the shaking and abnormal noise are still very noticeable during cold start.
Main reasons:
The rubber rubber sleeve on the bracket ages, cracks, hardens, or leaks oil (hydraulic type foot).
Rubber is a wear-prone part, with a general lifespan of about 6 years or 8-100,000 kilometers, and it bears the vibration and road impact from the engine.
Handling suggestions:
Timely inspection: Open the engine compartment and observe if there are cracks, collapses, or oil stains on the rubber part of the bracket.
Replace parts: Once damage is confirmed, it is recommended to replace them in pairs (left and right), do not just replace one part, otherwise the difference in elasticity between the new and old parts will cause uneven force, and the new part will wear out quickly.
Choose original factory or high-quality brand parts: Poor-quality brackets will fail again soon, it is not worth it.
Standard installation: When replacing, use a torque wrench to lock the bolts according to the standard torque, and let the bracket naturally bear the force after installation before tightening, otherwise the shock effect will be greatly reduced.
A fault that requires special attention: Breakage of the brake pedal bracket
This type of problem is relatively rare, but its nature is very serious and directly affects driving safety. The recent "Zunjie Auto Brake Pedal Bracket Base Breakage" incident has also attracted widespread attention.
Possible reasons:
Insufficient material and design margin: The brake pedal bracket is mostly made of engineering plastic (such as PA66 + GF30 glass fiber nylon), if the selected material is not strong enough or the structural stress concentration (such as the wall thickness of the shaft is too thin and there are no reinforcing ribs) occurs, it may break under extreme conditions.
Manufacturing process defects: Microscopic defects such as air holes and fusion marks may occur during injection molding, these areas have a strength much lower than the design value.
Extreme working conditions combined: The dynamic impact load generated by continuous high-frequency braking far exceeds the smooth pressing, which may cause the defect to expand rapidly.
Balance of collision safety design: To meet the intrusion volume requirements of the offset collision, the bracket is designed as a collapsible structure, and it is not infinitely strong.
Handling suggestions:
If the brake pedal has abnormal looseness, abnormal noise, or changes in travel, stop driving immediately and send it to a professional repair station for inspection.
Pay attention to the recall or free upgrade information released by the manufacturer. If Zunjie Auto has stated that it will optimize the component design and provide free upgrades to the users of vehicles that have been delivered.
For vehicles that have already broken, it is recommended to ask the manufacturer or 4S store to investigate the supplier, inspection and installation process.
Other body frame faults (such as trunk, headlights, etc.)
Trunk frame: Slight loosening can be fixed by tightening the screws or correcting the position. Severe damage requires replacement.
Headlight frame: Minor cracks can be repaired with strong glue. If the damage is severe, a new part should be replaced. It is recommended to choose original factory parts first.
Some practical suggestions for Shanghai car owners
Pay attention to the vehicle condition daily: If you notice idle shaking, abnormal noise or gear shifting shock, don't delay, go for an inspection as soon as possible. Damaged footpad glue not only affects comfort but may also affect the surrounding pipes and wiring of the engine in the long run.
Check during regular maintenance: Let the maintenance technician take a look at the condition of the rubber of the frame each time. It won't take much time.
Regarding safety components (such as brake pedals): If you have any doubts, it's better to go to a 4S store or professional repair shop for another check rather than taking a chance.
If you want to know more, keep reading the other articles on this site!
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