How to Shift into Second Gear?

Why do BMWs tend to skid on rainy days?

BMWs tend to skid on rainy days primarily due to severe tire wear, which causes the tread grooves to become shallow, reducing drainage efficiency. This creates a water film between the tires and the road surface, making skidding more likely. Reasons why BMWs are prone to skidding on rainy days: 1. Rear-wheel skid: This causes the vehicle to fishtail, making it uncontrollable for the driver. 2. Four-wheel skid: All four wheels lose the ability to rotate during this situation. 3. Front-wheel skid: Mostly occurs when taking curves or turns at excessive speeds on slippery surfaces. 4. Wet or rainy road conditions: Slippery surfaces reduce the friction between tires and the road below the critical threshold, leading to insufficient traction. This transforms into sliding friction, causing wheel spin and skidding. 5. Locking wheels during hard braking: Sudden braking that locks the wheels or abrupt acceleration causing wheel spin can both result in loss of traction and skidding.

16

2

Share

What are the requirements for fixed-point parking?

The evaluation criteria for the fixed-point parking and starting test item: points will be deducted for inaccurate parking, rolling back during start-up, or stalling. The specific contents are as follows: 1. Subject 1: Also known as the theoretical test for drivers, it includes knowledge related to driving theory, road safety laws and regulations, and local regulations. 2. Subject 2: Also known as the small road test, it refers to the field driving skill test, which includes five mandatory items: reversing into a garage, parallel parking, fixed-point parking and starting on a slope, turning at a right angle, and driving on a curve. 3. Subject 3: Also known as the big road test, it refers to the road driving skills in the motor vehicle driver's test. It generally includes: preparation before starting, starting, driving straight, shifting gears, changing lanes, pulling over, going straight through intersections, turning left at intersections, turning right at intersections, passing pedestrian crossings, passing school zones, passing bus stops, meeting vehicles, overtaking, making U-turns, and night driving. 4. Subject 4: Also known as the theoretical test for drivers.

6

3

Share

Can a Car Battery Be Repaired and Reused?

Car batteries can be repaired when they fail. Methods for repairing car batteries are as follows: 1. Shallow Cycle High-Current Charging Method for Repair: First, use a high current (5-hour rate) to fully charge the battery. Then, discharge 30% of the battery's capacity while ensuring the electrolyte temperature does not exceed 40 degrees Celsius. This process helps flush out minor sulfation on the electrode plates, allowing the sulfates to detach, dissolve, and convert back into active materials. Repeating this cycle three to four times can effectively repair the sulfation issue in car batteries. 2. Restoring Electrolyte Concentration in the Battery: Electrolyte concentration is a critical factor affecting battery performance. Abnormal concentration levels can accelerate battery degradation, necessitating repair. First, discharge the battery completely, then drain the existing electrolyte and replace it with a new solution at a concentration of 1.1g/cm³ to enhance lead sulfate solubility. Subsequently, charge the battery using a current below the 20-hour rate while maintaining the electrolyte temperature between 20~40 degrees Celsius. After completing the charging process, the sulfation issue will be resolved, and the battery capacity can typically recover to over 80%.

2

3

Share

Is the failure rate of Emgrand GL high after five years?

As long as the Emgrand GL is properly maintained and used, there are not many failures, and the Emgrand GL performs well in all aspects. Here are the specific details of the Emgrand GL: 1. Appearance: The Emgrand GL continues the family-style water ripple grille. The front of the car features new integrated LED headlights, with the fog lights adjusted to the top of the LED daytime running lights. The new 17-inch wheels and chrome door handles add more texture. At the same time, the design of the dual exhaust outlets makes the car look more sporty and youthful. 2. Interior: The Emgrand GL adopts a three-spoke multifunction steering wheel, paired with a large central control LCD screen, giving the car a very youthful overall appearance. In addition, the car has added intelligent functions, supporting remote control via a mobile app, which can remotely start the engine, open and close windows, and turn the air conditioning on and off. 3. Power: The Emgrand GL is equipped with 1.4T and 1.8L engines, and comes with a 6DCT dual-clutch, 6-speed manual, and 8CVT transmission for consumers to choose from. The 1.4T engine installed in the Emgrand GL has won the title of 'China Heart' Top Ten Engines, with many excellent features such as high performance, lightweight, ultra-durability, and low fuel consumption. Its maximum power is 98kW, and its maximum torque is 215N·m; the 1.8L engine has a maximum power of 98kW and a maximum torque of 170N·m.

20

1

Share

What Causes Slow Release of the Spring Brake?

It may be related to the performance of the brake master cylinder. The details are as follows: 1. Introduction: Air brake is a type of braking system. In automobiles, a series of specialized devices that apply a certain force (mainly on the wheels) from the external environment (primarily the road surface) to enforce a certain degree of braking are collectively referred to as the braking system. Automobile braking systems can be categorized based on their functions into service brakes (air brakes), parking brakes, emergency brakes, and auxiliary brakes. The parking brake can be further divided into central disc brakes and spring brakes, with the spring brake commonly known as the "spring brake" or "parking brake." 2. Components: A standard air brake system consists of the brake control mechanism, dual-circuit braking mechanism, central disc brake mechanism, brake actuators, and an air compressor. The brake control mechanism includes the brake pedal and pedal suspension; the dual-circuit braking mechanism includes the air reservoir, brake valve, low-pressure alarm, air pressure regulator, brake lines, directional valve, relay valve, safety valve, and drain valve; the central disc brake mechanism includes the parking brake lever, brake cables, and central disc brake.

2

1

Share

What does L4 and L3 mean in engines?

Engine L3 refers to an inline 3-cylinder engine, while L4 refers to an inline 4-cylinder engine. The specific details are as follows: 1. Introduction to engines: An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines and steam engines), and electric motors. For example, an internal combustion engine typically converts chemical energy into mechanical energy. The term 'engine' can refer to both the power-generating device and the entire machine that includes the power device (e.g., gasoline engines, aircraft engines). 2. Types of engines: Inline engine: All its cylinders are arranged side by side in a single plane. Its cylinder block and crankshaft have a simple structure, and it uses a single cylinder head, resulting in lower manufacturing costs, high stability, good low-speed torque characteristics, low fuel consumption, and compact size, making it widely used. The drawback is relatively lower power output. 'Inline' can be represented by the letter 'L,' followed by the number of cylinders to form the engine code. Modern vehicles mainly feature L3, L4, L5, and L6 type engines.

8

2

Share

How to Shift into Second Gear?

Why do BMWs tend to skid on rainy days?

What are the requirements for fixed-point parking?

Can a Car Battery Be Repaired and Reused?

Is the failure rate of Emgrand GL high after five years?

What Causes Slow Release of the Spring Brake?

What does L4 and L3 mean in engines?

What is the actual fuel consumption of the Lavida 1.5L?

Should the Land Rover Range Rover use 98-octane gasoline?

Is stopping less than 50 cm early or late at the designated point?

What causes the exclamation mark to appear on the car?