How to Use Exhaust Brake?
2 Answers
Exhaust brake usage method: When the accelerator pedal is at zero position and the fuel injector stops injecting fuel, the exhaust brake will automatically turn off if the accelerator or clutch pedal is pressed. This prevents the engine from stalling when stopping and ensures the exhaust brake does not activate during fuel injection. Exhaust brakes are widely used in large diesel vehicles. A regulating valve is installed on the engine exhaust pipe, and by closing this valve, the pressure during the exhaust stroke is increased, utilizing the generated negative pressure to obtain braking force. The regulating valve is generally driven by a control mechanism using compressed air or vacuum, and in most cases, it shares the same power source as the main brake system.
The exhaust brake is particularly useful when driving a truck. I've been running mountain roads for over 20 years and often use it to assist with downhill deceleration. The operation isn't complicated: after starting the engine, there's an exhaust brake switch on the dashboard or near the steering wheel—just find the small button or lever labeled 'Exhaust Brake' and press it gently to activate before descending. This increases exhaust flow resistance in the engine, naturally slowing the vehicle without wearing out brake pads. Note that it doesn't replace braking but helps reduce the load; turn it off once the slope ends or speed stabilizes to avoid unnecessary energy consumption. I once drove a heavy truck downhill from high altitude smoothly without any brake overheating issues—it's very safe. During routine vehicle checks, just ensure the exhaust system valves aren't clogged, and you can use it with confidence. This feature is ingeniously designed, saving both hassle and money.