Exhaust brake is widely used in large diesel vehicles. A regulating valve is arranged on the exhaust pipe of the engine, and the pressure of the exhaust travel is increased through the closure of the valve,
and the braking force is obtained by using the negative pressure generated. Regulating valve is generally driven by the use of compressed air or vacuum control mechanism, in most cases with the main brake
using the same power source. The exhaust brake is usually started by manual switch. In order to prevent the engine flaming when stopping and the exhaust brake action when fuel injection, the exhaust brake
is automatically lifted when the accelerator pedal or the clutch pedal is stepped down. Exhaust braking cannot be used on gasoline vehicles because the fuel supply must be cut off during operation.
Proper use of exhaust brake can greatly reduce the use of driving brake (brake), thus reducing shoe (or disc) wear, greatly reducing the driving safety risk caused by continuous overheating of shoe (or disc) brake.