What is the correct way to use an exhaust brake?
1 Answers
An exhaust brake (commonly known as an exhaust retarder) is a type of auxiliary braking device that functions as a secondary brake. Its purpose is to reduce or maintain vehicle speed without or with minimal use of the service brakes, although it cannot bring the vehicle to an emergency stop. Proper use of the exhaust brake can significantly reduce reliance on service brakes, thereby minimizing wear on brake pads (or discs) and greatly lowering the risk of overheating due to continuous braking, which could compromise driving safety. Key considerations for using an exhaust brake are as follows: 1. It is an auxiliary brake: The exhaust brake serves as a supplementary braking mechanism and cannot replace the service brake for emergency stops or be used as a parking brake. However, it can be used in conjunction with the service brake. 2. Preventing engine stalling when stopping: When the exhaust brake is engaged, the throttle pedal should be at zero position, and the fuel injectors stop injecting fuel. If the accelerator or clutch pedal is pressed, the exhaust brake will automatically disengage, preventing engine stalling when stopping and avoiding exhaust brake activation during fuel injection. 3. Engine exhaust braking power depends on engine speed: For optimal braking performance, when using the exhaust brake on long downhill slopes, select an appropriate gear (the transmission should not be in neutral) to keep the engine speed between 1600-2400 rpm. At lower engine speeds, the braking effect is limited, and it is advisable to shift to a lower gear or use conventional service brakes.
