Does keeping the exhaust brake on damage the engine?
2 Answers
Exhaust brakes can be used on long downhill sections, but prolonged use is not recommended. Long-term use of exhaust brakes can cause significant damage to the engine, especially affecting the valves. If driving on a long downhill section, it is advisable to use the exhaust brake every five seconds. Engaging the exhaust brake reduces engine speed, providing better braking performance for the vehicle. Below is more information about exhaust brakes: 1. Two forms of exhaust brakes: Exhaust brakes include two types—exhaust pipe braking and engine braking. When driving in gear, pressing the brake pedal triggers the exhaust brake, which enhances the vehicle's braking performance while also reducing wear on the brake shoes. The exhaust brake automatically disengages when the driver releases the brake pedal. 2. Precautions for using exhaust brakes: After activating the exhaust brake, the exhaust brake indicator light on the dashboard will illuminate. When using the exhaust brake, it is important not to shift to neutral or disengage the clutch, as this will cause the exhaust brake to fail and could potentially lead to serious accidents. Engine braking cannot replace the vehicle's service brake and should not be used for parking brakes. However, engine braking can be used in conjunction with the service brake. Therefore, the exhaust brake only serves as an auxiliary function.
As a long-haul truck driver who frequently drives, I don't think keeping the exhaust brake on all the time is good for the engine. I usually use it to help slow down on steep descents and reduce brake wear, but if I forget to turn it off or leave it on continuously, especially when driving on flat roads, the engine has to work harder. This increases pressure inside the cylinders, and over time, it can lead to carbon buildup and even premature aging of turbo components. I remember once forgetting to turn it off for several hours on the highway—the engine noise became louder, and a checkup revealed slightly elevated temperatures. So, I recommend turning it off promptly after descending hills instead of leaving it on for convenience. The exhaust brake is designed to protect the braking system and save fuel, but misuse may actually increase maintenance costs. Proper usage benefits the vehicle’s lifespan, whereas overuse strains the engine. Another key point: checking the vehicle manual is crucial, as different engine designs have varying tolerances—safety should always come first.
