The operating conditions of overseas heavy trucks are complex and varied, with long downhill slopes in mountainous areas, muddy construction sites, bumpy gravel roads, and frequent alternation of rainy and slippery roads. The braking system is subjected to high-intensity working conditions such as high-frequency start stop, high-temperature friction, and sediment erosion for a long time. As the core assembly of heavy truck driving safety, the durability of the braking system directly determines the safety and maintenance costs of the vehicle. Many overseas fleets only conduct maintenance and repairs when the brakes fail or deviate, neglecting daily refined protection, resulting in frequent failures such as brake pad wear, wheel hub high temperature, cylinder jamming, air leakage and pressure relief. The scientific maintenance method adapted to various overseas road conditions can effectively extend the service life of braking components and achieve long-term stable operation of the braking system.
For the long downhill working conditions in mountainous areas, the focus is on preventing high temperature and thermal attenuation maintenance. There are many steep slopes in overseas mountainous areas, and frequent braking and prolonged driving with brakes can cause continuous friction and heat accumulation between the brake drum and brake pads, which can easily lead to brake heat attenuation, resulting in soft brakes and insufficient braking force, posing a great safety hazard. For daily driving, priority should be given to using engine braking assistance for deceleration, coupled with a continuous cooling system to prevent coasting in neutral and frequent sudden braking. At the same time, regularly check the wear thickness of the brake drum to avoid deformation and cracking of the drum body caused by high temperature. Replace high-temperature resistant brake pads that are suitable for heavy-duty conditions to improve the thermal aging performance of the braking system.
In muddy and dusty working conditions, the core is to clean and prevent brake components from getting stuck. Construction sites, mining areas, and other dusty and muddy road conditions are prone to mud, sand, and gravel easily invading the gaps between brake shoes, sub cylinders, and brake rails. Long term accumulation can cause poor brake return, drag brake friction, and lead to problems such as wheel hub overheating, brake pad wear, and brake jamming. After the completion of the vehicle, it is necessary to promptly clean the sediment and dust attached to the brake system, regularly check the smoothness of the brake guide rail and pin shaft, add special lubricating grease to prevent component corrosion and jamming, ensure smooth brake fit and return, and avoid brake deviation caused by unilateral dragging.
Rainy and humid road conditions, strengthen the moisture-proof and rust proof maintenance of the gas path. The rainy season overseas is long and the air humidity is high, making it easy for water vapor to accumulate in the brake air circuit, resulting in water accumulation in the air reservoir, rusting of the valve body, aging and failure of the seals, leading to brake air leakage, slow brake response, brake pressure relief and other faults. Daily maintenance requires regular emptying of the air storage cylinder and dryer, checking the working status of the drying tank, and timely replacement of ineffective drying filter elements. At the same time, check the sealing performance of brake pipelines and joints, do a good job in rust prevention of metal parts, and prevent air path failures caused by water vapor erosion.
Implement regular and refined pre inspection to build a solid foundation for long-term protection. Abandoning the passive maintenance mode of "repairing when it breaks", check the wear level of brake pads, brake clearance, and the working status of the cylinder synchronously during each maintenance, calibrate the uneven clearance in a timely manner, and avoid excessive local wear. Regularly inspect rubber accessories such as brake springs and dust covers, replace aging and cracked parts in a timely manner, and prevent impurities from entering. Eliminate overloading and unbalanced driving, reduce the loss of the braking system under overload conditions, and lower the incidence of braking failures from the source.
Overall, overseas multi road conditions cause significant damage to heavy-duty truck braking systems, and targeted differentiated maintenance is the key to extending braking life and reducing operation and maintenance costs. Overseas fleets need to take into account the characteristics of road conditions, carry out special maintenance for high temperature, sediment, moisture, and rust prevention, cooperate with regular pre inspection and maintenance, effectively avoid braking hazards, improve the braking stability and durability of heavy trucks in complex road conditions, and ensure the safety, efficiency, and continuous attendance of the fleet.
