Does Failing to Sign After Passing the Theory Test (Subject 1) Invalidate the Exam?

When to Refuel Based on Fuel Gauge?

Refuel when the fuel gauge shows one bar remaining. Below are the steps and precautions for refueling a car: Steps for refueling a car: Park the car next to the fuel pump at a gas station, with the fuel tank filler opening facing the pump. The location of the fuel tank cap is indicated on the dashboard by an arrow pointing to its position; turn off the engine; after payment, you can ask the attendant to assist with refueling or do it yourself. Remove the nozzle from the pump's holder and insert it into the car's fuel tank filler opening, select the desired gasoline grade (octane rating), and trigger the nozzle; or hold the nozzle while the fuel is flowing; or set the nozzle to flow automatically, which will shut off when the tank is full; check if the oil level is normal; tighten and close the fuel tank cap. Precautions for refueling a car: The fuel pump in the tank is cooled by gasoline. If the gasoline level is too low and the fuel pump is not submerged, prolonged operation in this state may reduce the fuel pump's lifespan. When driving in the city, it is not necessary to fill the tank completely because city driving involves frequent stops and starts. A full tank increases the engine's load. It is recommended not to fill the tank beyond two-thirds of its capacity. Overfilling can cause gasoline to overflow, which may flow into the intake manifold through the pipes and "drown" the spark plugs, leading to the engine stalling immediately after refueling. In severe cases, the car may fail to start normally, and gasoline may even leak from the carbon canister, posing a significant fire hazard if exposed to open flames.

2

5

Share

How Many Kilometers Do Shock Absorbers Need to Be Replaced?

There is no fixed replacement cycle for car shock absorbers. Generally, they should be replaced every 100,000-120,000 kilometers or every 6-8 years. Shock absorbers for household cars are usually lightweight and do not require frequent replacement under normal driving conditions. Function of Shock Absorbers: Shock absorbers are hydraulic devices used to absorb and buffer vibrations from road feedback. The relationship between shock absorbers and shock absorber springs is inseparable. When a vehicle is driven on uneven roads, the tires absorb a certain amount of bounce, and the remaining bounce is transmitted to the suspension system supporting the tires. In the suspension system, the shock absorber spring is mainly used to absorb the bounce feedback from the tires, while the shock absorber core prevents the shock absorber spring from repeatedly bouncing (the shock absorber spring and core together form the shock absorber assembly). On uneven roads, the shock absorber is used to absorb vibrations caused by road irregularities during vehicle movement. When the shock absorber is working, the shock absorber spring repeatedly bounces. The shock absorber core tightens the shock absorber spring to prevent it from bouncing repeatedly. Inside the shock absorber core, the hydraulic system relies on hydraulic oil to generate damping through repeated compression by the piston. After long-term operation, the internal hydraulic oil piston of the shock absorber core may experience issues such as aging, hardened hydraulic valves, and degraded hydraulic oil performance. Impact of Damaged Shock Absorbers on the Car: If one shock absorber leaks oil, it can cause the car body to become unbalanced, with one side higher than the other, leading to automatic deviation during driving and exacerbating irregular tire wear; If the shock absorber top rubber ages and falls off, it can cause the shock absorber to collide with other components, resulting in abnormal noises, which is often the cause of chassis noises; If the shock absorber spring becomes weak and lacks sufficient extension force, the shock absorption and buffering effects will be significantly reduced, increasing the hydraulic pressure on the shock absorber and leading to oil leakage. Self-Inspection of Shock Absorbers: Press hard on the bumper; if the car body shakes up and down two or three times, the shock absorber is in good condition; After driving ten kilometers on rough roads, touch the shock absorber housing to see if it is hot. If it is, it indicates insufficient internal oil and should be replenished promptly; If the vehicle drives slowly and exhibits a strong reaction during emergency braking, it indicates a problem with the shock absorber, which should be repaired promptly;

8

4

Share

Can tires one inch larger pass the annual inspection?

No. The following are the relevant regulations on vehicle modifications: 1. Approval required: Any modifications to a motor vehicle must be carried out within the scope specified by the traffic management department. This includes modifications to body color, engine, fuel type, and license plate number. After submitting an application, the driver must obtain approval from the traffic management department before proceeding with the modifications. 2. Unauthorized modifications prohibited: No unit or individual is allowed to assemble a motor vehicle or modify its registered structure, construction, or features without authorization. 3. Scope of modification activities: Without permission from the public security traffic management department, any unauthorized modifications to the vehicle's chassis, engine, suspension, transmission system, steering system, tire rims, lights, body color painting, exterior structure, or any technical data that does not match the data announced by the State Council's motor vehicle product authority are considered modification activities.

8

4

Share

What does 'Please connect HFP first' mean?

The full name of HFP in cars is Hands-free Profile, which is a software that allows Bluetooth devices to control phone functions such as answering, hanging up, rejecting calls, and voice dialing. The HFP car Bluetooth feature is very convenient to use and can effectively reduce safety hazards. Once the phone is connected to the car's Bluetooth, calls can be managed directly through the car's system. Below is an introduction to car Bluetooth: 1. Function: Bluetooth/car phone is designed for driving safety and comfort. Passengers only need a Bluetooth-enabled phone to connect to the car's Bluetooth, enabling them to make and receive calls through the car's system. 2. Features: Automatically recognizes mobile phones without the need for cables or phone holders; users can control the phone without touching it (keeping both hands on the steering wheel) and use voice commands to answer or make calls. Users can communicate via the car's audio system or Bluetooth wireless headsets.

12

1

Share

Can a Nail Puncture on the Inner Side of a Tire Be Repaired?

Tires with nail punctures on the inner side are not recommended for repair and should be replaced. The sidewall is the weakest part of a tire, constructed with two layers of rubber and two layers of cord fabric, and passenger car tires typically do not have a steel belt layer in the sidewall for shock absorption. Additionally, the sidewall undergoes constant deformation and recovery during rotation. Forcing a repair can cause the patch to detach, and even hot patching only provides a temporary solution, as broken cord fabric cannot be repaired. Below are relevant details: 1. Situations requiring tire replacement: puncture holes larger than 6mm in diameter on the tread; deformed bead or tread, corroded rubber, or damage due to underinflation; tires that have been patched more than four times. 2. Precautions: It is also important to note that whether the nail is in the sidewall or tread, it should not be removed immediately. Instead, drive to a nearby repair shop for professional handling. Sometimes, removing the nail may not cause immediate air leakage, but it still requires attention.

9

5

Share

What is the size of the shock absorber oil seal for a 125cc motorcycle?

The size of the shock absorber oil seal is 30*40.5*10.5. Below is relevant information about oil seals: 1. Cause of the issue: The primary factor leading to oil leakage is the poor sealing of the oil seal. When the shaft wears and forms grooves, even replacing the oil seal with a new one fails to seal properly. This occurs because the contact pressure between the oil seal lip and the shaft decreases, resulting in insufficient interference between the oil seal lip diameter and the shaft diameter after installation. 2. Functions and applications: Engine: Crankshaft—front and rear crankshaft oil seals; Valve—valve oil seal (engine repair kit O-ring) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); Camshaft—camshaft oil seal; Transmission: Transmission—front and rear transmission oil seals, shift lever oil seal (transmission repair kit O-ring) (transfer case—front and rear transfer case oil seals); Rear axle: Half shaft—rear half shaft oil seal; Differential—front and rear angular contact oil seals, rear wheel oil seal, front wheel oil seal, steering gear oil seal (steering gear repair kit O-ring), steering booster oil seal (front half shaft oil seal).

14

2

Share

Does Failing to Sign After Passing the Theory Test (Subject 1) Invalidate the Exam?

When to Refuel Based on Fuel Gauge?

How Many Kilometers Do Shock Absorbers Need to Be Replaced?

Can tires one inch larger pass the annual inspection?

What does 'Please connect HFP first' mean?

Can a Nail Puncture on the Inner Side of a Tire Be Repaired?

What is the size of the shock absorber oil seal for a 125cc motorcycle?

What is the fuel consumption of the Buick Envision?

How much can you exceed the 120 speed limit in a section speed measurement?

Is the Car AC Light On or Off?

What is the purpose of a motorcycle auxiliary water tank?