How to Use the Exhaust Brake?
3 Answers
When using the exhaust brake, the accelerator pedal should be at the zero position, and the fuel injector stops injecting fuel. Pressing the accelerator pedal will automatically turn off the exhaust brake to prevent the engine from stalling when stopping. It is best not to use the exhaust brake on icy or slippery roads, as there is a risk of the vehicle experiencing drive wheel slip or skidding. For optimal braking performance, it is recommended to select an appropriate gear when using the exhaust brake on long downhill slopes.
Over the years of driving trucks, I've frequently used the exhaust brake—it's incredibly useful on long downhill slopes. I always remember to downshift to an appropriate gear before entering a steep descent, like shifting from 10th to 7th gear, keeping the engine RPM between 1,800 and 2,500 to avoid engine damage. Then, I gently press the exhaust brake switch—usually a button or lever near the steering wheel—and immediately feel the vehicle slow down noticeably, with a distinct deceleration sensation. It's crucial to combine it with foot braking and not rely solely on the exhaust brake; on very long descents, use it intermittently, like 10 seconds on and 5 seconds off, to prevent overheating the exhaust system. What I love most is how it significantly reduces wear on the main brake pads, saving a lot on maintenance costs after a mountain trip. However, be careful not to use it at low RPM or when unloaded, as it might cause engine knocking or strange noises.
As a mechanic, I've helped many car owners adjust their exhaust brakes. First, before using it, make sure the vehicle is running and the engine temperature is normal. After starting the car, locate the exhaust brake switch (its position varies by model, often near the dashboard). Press the button when you need to decelerate, such as when going downhill at high speed. Simultaneously, shift the transmission to an appropriate lower gear to ensure the exhaust brake works effectively; otherwise, the braking effect will be weak or cause shaking. Avoid sudden acceleration during operation—maintain a steady speed. If you're unfamiliar with it, practice more to get used to the feel. After parking, I always check if the exhaust system is functioning properly and recommend that owners inspect the related wiring and valves monthly to prevent failure due to dirt buildup. This auxiliary brake extends the life of the main brake system, but the key is to use it wisely—don't rely on it alone.
