What is the lower part of the front part of the car's rear end?
The term "lower part of the car's front buttocks" is not a standard term. In everyday language, it generally refers to the area at the very bottom of the car's front, below the bumper. The corresponding components vary from model to model. Common names for this area include:
Front lip: The most common term, which is the plastic/carbon fiber strip extending outward or downward below the front bumper. It mainly serves for decoration and a slight aerodynamic effect.
Front skirt plate/conduits: A connecting plate installed below the bumper and inclined downward, used to improve air flow and increase downforce, making the car more stable at high speeds.
Air dam/front scoop: Common on modified vehicles or high-performance cars, to achieve a lower visual effect and stronger downforce. This is often added when pursuing a lower profile and stronger grip at high speeds.
Anti-dirt strip: Some models have a plastic strip that protrudes significantly from the lower edge of the bumper. Its main function is to "warn" - it will first touch the strip when crossing a bump or going uphill, alerting you to avoid scraping the chassis and oil pan.
In simple terms, for regular family cars, it is usually called the front lip; for modified or high-performance cars, the protruding part is often called the front scoop or air dam. You can squat down to look at the bottom of the car's front. If it is a plastic strip along the lower edge of the bumper, then it is the front lip and there is no need to worry.
The "lower part of the car's front buttocks" generally refers to the black plastic piece at the bottom of the front bumper. It is not for decoration; its main functions include:
Protecting the chassis: This is the most practical function. The plastic guard plate or anti-dirt strip along the lower edge of the front bumper can prevent direct contact with critical components such as the oil pan and transmission when crossing potholes or going uphill. It is lower than the chassis, so touching it first is a warning - hearing the scraping sound means you should slow down.
Streamlining air flow and increasing stability: This part is usually called the front lip, front spoiler or air dam. At high speeds, it can reduce the airflow entering the car's bottom, generating downforce, making the front wheels grip more firmly, reducing drift at high speeds, and also lowering wind resistance and fuel consumption.
Protecting front components: It can block some flying stones and sand, avoiding direct contact with the water tank and the bottom of the engine, and also reducing driving noise.
If you hit it while driving, it is best to find a flat road to check if the guard plate is loose or deformed. Just scratches usually don't matter, but if the guard plate falls off or the retaining clips break, it is recommended to handle it promptly to avoid exposing the chassis components.
When there is a fault in the lower part of the car's front (the chassis area at the front of the car), it is usually not caused by a single reason. The specific manifestation can be abnormal noise, shaking, oil leakage, or abnormal vehicle posture. Considering your location in Shanghai, if the problem involves suspension or chassis, it is recommended to first visit a professional repair shop with a lift and capable of performing four-wheel alignment to check the issue, rather than directly replacing parts.
First, determine which type of "fault" it is
Based on your description, first distinguish which category it belongs to, and the corresponding handling methods vary greatly:
Abnormal noise (cracking "clunk" when crossing bumps, "creaking" when jolting, "clicking" when steering):
The most common is the aging and cracking of the rubber sleeve of the lower arm or the loose rubber sleeve of the balance bar, which will produce "clunk" or "creak" sounds when crossing减速带 or bad roads.
Leaking shock absorber or aging top rubber， crossing bumps will produce "thumping" sounds， and the vehicle's rebound and shaking will be obvious.
Ball joint wear (steering crossbar ball joint， lower arm ball joint)， when steering at low speed or driving on bumpy roads， there will be "clicking" sounds， and the steering may become unstable.
Shaking/loss of stability (high-speed steering shaking， vehicle swaying， feeling numb under the seat when driving)：
First check if the engine foot rubber (engine clutch pad) is aging and leaking， as it will directly transmit the engine's shaking to the interior， manifesting as idle shaking and seat vibration.
Then check if the lower arm sleeve and shock absorber are ineffective， which can cause loss of stability at high speeds and brake nodding.
Leaking oil/dripping water：
Water dripping from the front of the car， in summer when using air conditioning， it is normal condensation water； If the oil is colored (brown engine oil, red transmission oil, yellow power assist oil), then it is necessary to be vigilant.
Check if there is oil leakage in the oil pan, the crankshaft oil seal, the valve cover gasket, and the brake oil pipe - this is very crucial as it relates to the safety of the brakes.
Abnormal vehicle posture (the front or rear of the vehicle sinking significantly, one side higher than the other):
This is called "buttressing" or "head sinking", usually caused by spring fatigue or shock absorber failure. Long-term overloading will also accelerate this.
How to handle it
Mild abnormal noise/leakage: You can first check it yourself - press the front of the vehicle to see if the rebound is normal, squat down to see if the tires have stones, and check the position of the oil droplets on the ground. If it is only the aging of the rubber sleeve, many repair shops can only replace the rubber sleeve without replacing the entire assembly, which can save a lot of money.
Moderate or higher problems: Do not force the vehicle to drive. Especially for abnormal noises or leaks related to braking or steering, continuing to drive may turn small problems into major faults.
Preparation before sending for repair: Remember to clearly record "when it makes a noise, at what speed, whether it is related to steering/braking, and where the oil droplets are located". The technician can locate it more quickly, reducing the risk of incorrect disassembly and replacement.
For abnormalities involving the braking or steering system, it is not recommended to continue driving for a long distance. Safety comes first. Contact the repair shop to confirm whether it can come for inspection, and then decide whether to drive there.
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