Can the Exhaust Brake Be Used for a Long Time?

2 Answers
BryceFitz
07/25/25 1:05pm
Exhaust braking is also a braking method for large trucks when going downhill, but it should not be used for a long time, as it can cause significant damage to the engine, especially affecting the valves. It is recommended to use it with intervals of about 5 seconds each time. Its working principle is to achieve a rapid increase in local air pressure in a small space by closing the air valve, thereby reducing the engine speed to achieve the braking effect. The usage methods of exhaust braking are as follows: 1. When the vehicle is in gear and moving, stepping on the brake pedal will trigger the exhaust brake, which can improve the vehicle's braking performance and reduce the wear of the brake shoes. Releasing the pedal will deactivate the exhaust brake. 2. When going downhill, the exhaust brake switch can be turned on separately. Releasing the accelerator and clutch pedals will activate the exhaust brake, and the exhaust brake indicator light on the dashboard will illuminate. Stepping on the accelerator pedal or clutch pedal will deactivate the exhaust brake.
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VonJace
08/11/25 8:37pm
I've driven heavy trucks for twenty years, and exhaust brakes are indeed a great help in mountainous downhill areas to save brake pads, but they shouldn't be used for extended periods. Otherwise, the engine can easily overheat to the limit, potentially damaging valve components, and the entire exhaust system may deform or fail. Once, I used it continuously for over half an hour on a long downhill stretch, and the engine temperature soared to dangerous levels. Later, I had to send it to the repair shop to replace the entire exhaust system, costing both money and time. In normal driving, I briefly turn it on for about ten seconds to assist with deceleration and then turn it off, allowing the vehicle to cool down and recover. I combine it with foot braking to control speed for stability and safety, which helps avoid accidental damage and extends the vehicle's lifespan.
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