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What is the usage method of exhaust brake?

2 Answers

DeAngelina

07/25/25 10:15am

Exhaust brake usage method: A regulating valve is installed on the engine exhaust pipe. By closing this valve, the pressure during the exhaust stroke is increased, utilizing the generated negative pressure to obtain braking force. The following are precautions for using exhaust brake: 1. Auxiliary braking: Exhaust brake is an auxiliary braking method and cannot replace service brake for emergency braking, nor can it be used for parking brake. However, exhaust brake can be used simultaneously with service brake. 2. Throttle return to zero: When using exhaust brake, the throttle pedal should be at zero position, and the fuel injector stops injecting fuel. If the accelerator pedal or clutch pedal is depressed, the exhaust brake will automatically turn off, which can prevent engine stalling when stopping and exhaust brake activation during fuel injection.

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DeAddyson

08/11/25 7:38pm

I've been driving heavy trucks on mountain roads for over a decade, and the exhaust brake is absolutely a life-saving trick for downhill driving. The operation method is to downshift to second or third gear in advance, press the switch button after stabilizing the speed, which will increase the engine braking effect without constantly stepping on the brake pads. Remember to turn it off promptly after the downhill section to prevent engine damage from excessively high RPM. It's especially effective when carrying heavy loads, avoiding brake failure accidents while saving fuel and protecting the vehicle. Regularly check if the switch position is responsive - buttons may be located on the center console or near the steering wheel depending on vehicle models. Develop good habits for a safe journey home.

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