What is Engine Exhaust Brake?

1 Answers
Reagan
07/30/25 3:47am
Engine exhaust brake refers to the installation of a regulating valve on the engine exhaust pipe. By closing this valve, the pressure during the exhaust stroke is increased, and the resulting negative pressure is utilized to generate braking force. The exhaust brake is typically activated by a manual switch. To prevent engine stalling when stopping and to avoid exhaust brake operation during fuel injection, the exhaust brake is automatically deactivated when the accelerator pedal or clutch pedal is pressed. Since fuel supply is cut off 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 (foot brakes), thereby reducing wear on brake pads (or discs) and lowering the risk of driving safety caused by overheating due to continuous braking of the pads (or discs).
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