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Where is the exhaust brake turned on?

2 Answers

McJuliette

07/29/25 10:25pm

Large trucks' exhaust brake switch is usually integrated with the wiper controls; light trucks do not have this equipment. How to use the exhaust brake: It is integrated with the wiper switch. Lift this switch, release the clutch pedal and accelerator pedal, and ensure the transmission is in a gear other than neutral for the exhaust brake to take effect. To deactivate the exhaust brake, simply press the exhaust brake switch again. More details are as follows: 1. Exhaust brakes are widely used in large diesel vehicles. A regulating valve is installed on the engine exhaust pipe. Closing this valve increases the pressure during the exhaust stroke, utilizing the generated negative pressure to obtain braking force. 2. Mechanically driven, in most cases, it shares the same power source as the main brake. The exhaust brake is generally activated by a manual switch. To prevent the engine from stalling when parked and to avoid the exhaust brake engaging during fuel injection, the exhaust brake is automatically deactivated when the accelerator pedal or clutch pedal is pressed. 3. Since it requires cutting off the fuel supply during operation, the exhaust brake cannot be used in gasoline vehicles. Proper use of the exhaust brake can significantly reduce the use of service brakes (braking), thereby reducing wear on brake pads (or discs) and greatly lowering the risk of driving safety caused by overheating due to continuous braking of pads (or discs).

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SanLila

08/15/25 11:08pm

I'm a seasoned big truck driver, and the exhaust brake switch is usually on that small lever to the left of the steering wheel. Just reach out and flip it to activate—super convenient. I've been hauling loads on mountain roads for 20 years and often use it to slow down on long descents, saving wear and tear on the brake pads. The switch is positioned within easy reach to keep drivers from getting distracted searching for it. Remember to use it only when necessary, like on slippery roads or steep slopes—don't mess around with it on flat terrain, or you risk overloading the engine. Some newer models integrate the switch into the steering wheel buttons for more intuitive operation. Regular maintenance checks are also key to ensure the wiring stays in good shape.

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