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What to do when you come across a long downhill? Don't keep hitting the brakes frequently
If you ask experienced truck drivers what road conditions they fear the most, long downhill stretches are definitely one of them. This is because long downhill roads are often hotspots for truck accidents. To control speed, the time and frequency of braking increase, which can lead to a series of serious problems. So what should you watch out for on continuous long downhill slopes? How can you ensure driving safety?
▎Check the vehicle regularly and check again before going downhill
When vehicles run for a long time, it's inevitable that they might have some 'bad condition', so during daily operation, regular vehicle checks are necessary, especially for safety-related features, such as whether the brake gap is normal; whether the brake pads are excessively worn; if the pressure gauge is leaking; if the brake drum has cracks; whether the brake return spring is working correctly; and whether the dryer is functioning properly. Any issues should be repaired or replaced promptly.
In the current transport market, driving through southern mountain areas often requires the installation of water-spraying devices. Although this may be considered an illegal modification, for safety reasons, many long downhill sections will have reminders to fill the water tank and check the spraying equipment to avoid brake failure due to overheating. As the saying goes, better safe than sorry. When driving on long downhill roads, never be careless. Even if you are very familiar with the road, make sure to check everything before setting off to ensure all parts are working properly.
Slow down in advance on downhill sections and never coast in neutral.
Learning defensive driving is an essential lesson for driving. When approaching a long downhill section, regardless of whether there is auxiliary braking equipment, you should make preparations in advance, stay cautious at all times, and constantly pay attention to roadside warning signs and emergency lanes. The roadside warning signs may indicate the road conditions ahead, such as 'long downhill for xx kilometres ahead'. Before descending a long slope, you should downshift to slow down in advance because driving in a low gear allows the engine's resistance to help control the speed. Driving at a low speed also reduces brake usage, lowering the risk of brake fade. Downshifting in advance also helps avoid the problem of being unable to quickly shift gears during an emergency, which could lead to an accident.
Also, never coast in neutral. Many drivers think that "coasting in neutral saves fuel," but that's a misconception. Coasting in neutral doesn't save fuel; in fact, it brings more safety risks. When idling, the air pump's output is low, and going downhill frequently requires braking, which uses more air. Coasting in neutral for long distances can deplete the air in the tank and risk brake failure.
▎Install auxiliary brakes and consider hydraulic retarders when buying a truck
With the development of commercial vehicle technology, many heavy trucks now offer optional auxiliary braking features like hydraulic retarders, engine brakes and exhaust brakes. Engine brakes are mainly used at low speeds, but you should be careful not to use them on slippery roads. Hydraulic retarders, on the other hand, work more effectively at high speeds. If you often drive on mountain roads, it’s recommended to have an engine brake or retarder installed, so you can ensure braking safety at both high and low speeds. If the vehicle has a hydraulic retarder, you can also use its different braking levels to slow down during everyday driving, which reduces brake usage and extends the life of the brake pads.
You also need skill when braking; you can't keep pressing the brake all the time. You need to brake according to your speed. If the speed is high, you can use engine downshifting and auxiliary braking to slow down first. When braking, press the brake fully to slow down and then release it, brake intermittently, and try to reduce the frequency of braking, avoiding continuous braking to prevent the brake drum from overheating.
Editorial Note:
The freight industry is a high-risk sector, so safety is crucial during daily operations. In summary, check before going downhill, operate correctly while descending, and stay calm if an accident occurs to minimise losses. I hope everyone can stay safe and make good money.
Focus on the research and development of automotive brake systems and pneumatic brake valves to promote the development of the auto parts industry!
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