What is the working principle of the brake light switch?

1 Answers
FernandoDella
07/25/25 4:37pm
The working principle of the brake light switch is: by turning itself on and off, it sends a battery signal to prompt the relevant system to act or control the power on/off function of the brake light. During operation, it controls the turning on and off of the brake light by stepping on or releasing the brake pedal, i.e., when the brake pedal is pressed or released. When the light is on, it can alert the following vehicle that the leading vehicle has entered a braking state, prompting them to slow down or maintain a safe distance. Brake light switch inspection methods: 1. Turn on the ignition switch, press the brake pedal, and check whether the brake lights at the rear of the vehicle light up; 2. Use a diagnostic tool to perform self-diagnosis on the ABS, ASC, and DSC control systems to check if there are any fault codes related to the brake light switch; 3. For vehicles equipped with a DSC control system, the performance of the brake light switch is tested based on the brake fluid pressure sensor signal, and relevant fault codes are set to ensure the correct working stroke of the brake light switch.
Was this review help?
4
1
Share
More Forum Discussions

Is it safe to drive with underinflated tires?

Tires with insufficient air pressure can be driven at low speeds for short distances, but high-speed or long-distance driving should be avoided. When tire pressure is too low, high-speed driving may cause wave-like deformation, increasing the risk of a blowout. Tire pressure can be about 10% higher than the recommended level, but it must never fall below it, as severely low pressure significantly compromises driving safety. If tire pressure drops unexpectedly during normal use, check for punctures or air leaks. Any punctured or leaking tires should be repaired or replaced promptly. During regular vehicle maintenance, applying dashboard wax to the tire surface can help slow down rubber aging.
2
0
Share

Where is the fuse box of Baojun 360 located?

The fuse box of Baojun 360 is located on the lower side of the instrument panel, and it can be seen by pulling out the storage box. Fuse is its commonly used name, and its real name is circuit breaker. For easier understanding, it is generally referred to as a fuse. The function of the fuse is to protect the car's circuit when the circuit current is abnormal and exceeds its rated current, causing it to blow. Baojun 360 is a model under SAIC-GM-Wuling, with body dimensions of 4615mm in length, 1735mm in width, and 1660mm in height, and a wheelbase of 2750mm. In terms of appearance, Baojun 360 adopts a new design language, featuring a new hexagonal design for the front grille paired with eagle-eye headlights.
9
0
Share

What does the exclamation mark inside a triangle mean?

An exclamation mark inside a triangle indicates a malfunction in the vehicle's general performance, components, or functions. Common issues include parking sensor failure, fuel cutoff system intervention or malfunction, external light failure, or engine oil pressure sensor failure. Solution: Visit a 4S shop for inspection to identify the source of the fault. The exclamation mark is a common fault warning in vehicles. Besides the exclamation mark inside a triangle, there are four other forms of exclamation mark warnings: an exclamation mark inside a yellow gear, an exclamation mark inside a red circle with brackets, an exclamation mark with a horizontal line below brackets, and a yellow bulb with an exclamation mark. Below is a detailed analysis of these four scenarios: Automatic transmission fault: An exclamation mark inside a yellow gear is the automatic transmission fault warning light, indicating a transmission malfunction or low transmission fluid. The transmission fluid should be replaced promptly. Brake system fault: An exclamation mark inside a circled bracket represents a brake system warning, typically indicating a brake system malfunction or low brake fluid level. Immediate inspection of the brake system is required to avoid accidents. Tire pressure anomaly: An exclamation mark with a horizontal line below brackets is the tire pressure monitoring warning light, which illuminates when the tire pressure is too low. Check the tire pressure and restore it to the normal range. Lighting fault: A yellow bulb with an exclamation mark is the lighting fault indicator, signaling a malfunctioning vehicle light. Solution: Visit a 4S shop as soon as possible for inspection and repair, or conduct a self-check focusing on commonly used bulbs such as turn signals, fog lights, and interior lights to identify the issue.
4
0
Share

What is the engine model of the 2018 Touran?

The 2018 Touran is equipped with the EA211-CSS engine, which delivers a maximum horsepower of 150 HP, a maximum power output of 110 kW at 5000 rpm, and a peak torque of 250 N·m. The engine used in the 2018 Touran is produced by Shanghai Volkswagen, a Sino-German joint venture, making it domestically manufactured. Here are some daily maintenance tips for the 2018 Touran's engine: Use lubricating oil of the appropriate quality grade. For gasoline engines, select SD-SF grade gasoline engine oil based on the additional equipment in the intake and exhaust systems and usage conditions. For diesel engines, choose CB-CD grade diesel engine oil according to mechanical load, ensuring the standard meets or exceeds the manufacturer's requirements. Regularly change the engine oil and oil filter. The quality of any lubricating oil will degrade over time. After a certain mileage, its performance deteriorates, leading to various engine issues. To prevent malfunctions, change the oil periodically based on usage conditions and maintain an appropriate oil level. As oil passes through the fine pores of the filter, solid particles and viscous substances accumulate in the filter. If the filter becomes clogged and oil cannot pass through, it may rupture the filter or open the safety valve, allowing dirty oil to bypass the filter and return to the lubrication system, accelerating engine wear and increasing internal contamination. Regularly clean the crankcase. During engine operation, high-pressure unburned gases, acids, moisture, sulfur, and nitrogen oxides from the combustion chamber enter the crankcase through the gap between the piston rings and cylinder walls. These mix with metal particles from component wear to form sludge. Small amounts remain suspended in the oil, while larger amounts precipitate, clogging filters and oil passages, making engine lubrication difficult and causing wear. Periodically use a radiator cleaner to flush the radiator. Removing rust and scale deposits not only ensures proper engine operation but also extends the lifespan of both the radiator and the engine.
13
0
Share

Can a Financed Vehicle Be Sold?

A vehicle with an outstanding loan cannot be sold. To sell the car, the remaining loan must be paid off in full. The individual only has the right to use the car during the loan period. Once the loan is fully repaid and the vehicle lien release procedure is completed, ownership of the car will revert to the individual. Only with full ownership can the car be freely bought and sold in the market. One option is to negotiate with the buyer to pay a portion of the car's price upfront, use that to settle the remaining loan, and then proceed with the transaction, after which the buyer pays the remaining balance. Three essential procedures for used car transactions: Used car transactions primarily include: pre-evaluation work, technical condition assessment, consignment, trade-in services, price evaluation, and transaction practices. The mandatory procedures mainly involve vehicle documentation and maintenance records. Vehicle documentation: Includes three key certificates. The most common is the "People's Republic of China Motor Vehicle License" issued by the vehicle registration authority (DMV), the vehicle ownership certificate (similar to a property deed) called the "People's Republic of China Motor Vehicle Registration Certificate" also issued by the DMV, and the "Motor Vehicle Source Document" which mainly includes the nationwide standardized motor vehicle sales invoice and used car transaction invoice. Maintenance records: When a vehicle enters the usage phase, it naturally requires maintenance. The documentation of this process is called maintenance records, which come in three forms: 1. Vehicle user manual (owner's manual) 2. Maintenance manual (either separate or combined with the user manual) - this is particularly crucial when buying a used car as it comprehensively records all past maintenance including dates, mileage, and services performed. Note that some maintenance facilities upload records online rather than documenting them in the manual, and older vehicles not serviced at manufacturer-approved centers may have incomplete records. Buyers should pay special attention to these aspects. Tax and fee documentation: After vehicle registration and during use, various taxes, fees and insurance payments are made, collectively referred to as tax and fee documentation.
3
5
Share

What engine is used in the BYD L3?

The BYD L3 is equipped with two types of engines, with model numbers BYD473QE and BYD483QA. The BYD473QE engine has a maximum horsepower of 109 hp, a maximum power output of 80 kW, a maximum power speed of 5800 rpm, and a peak torque of 145 N.m. The BYD483QA engine has a maximum horsepower of 122 hp, a maximum power output of 90 kW, a maximum power speed of 6000 rpm, and a peak torque of 160 N.m. The engines used in the BYD L3 are independently developed by BYD and are produced in Shenzhen. For daily maintenance of the BYD L3 engine, the following methods can be used: Use lubricating oil of appropriate quality grade. For gasoline engines, SD--SF grade gasoline engine oil should be selected based on the additional devices of the intake and exhaust systems and usage conditions; for diesel engines, CB_CD grade diesel engine oil should be selected according to mechanical load, with the selection standard not lower than the manufacturer's specified requirements. Regularly change the engine oil and oil filter. The quality of any grade of lubricating oil will change during use. After a certain mileage, performance deteriorates, which can cause various problems for the engine. To avoid malfunctions, the oil should be changed regularly according to usage conditions, and the oil level should be kept moderate. When oil passes through the fine holes of the oil filter, solid particles and viscous substances in the oil accumulate in the filter. If the filter becomes clogged and oil cannot pass through the filter element, it may burst the filter element or open the safety valve, allowing oil to bypass through the bypass valve and carry contaminants back to the lubrication areas, accelerating engine wear and increasing internal contamination. Regularly clean the crankcase. During engine operation, high-pressure unburned gases, acids, moisture, sulfur, and nitrogen oxides from the combustion chamber enter the crankcase through the gap between the piston rings and cylinder walls, mixing with metal particles from component wear to form sludge. When the amount is small, it remains suspended in the oil; when the amount is large, it precipitates from the oil, clogging the filter and oil passages, making engine lubrication difficult and causing wear. Regularly use a radiator cleaner to clean the radiator. Removing rust and scale not only ensures the normal operation of the engine but also extends the overall lifespan of the radiator and engine.
13
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.