What Happens If the Exhaust Brake Is Always On?
2 Answers
The exhaust brake of a car should not be left on continuously, and long-term use is not recommended. Prolonged use of the exhaust brake can cause significant damage to the engine and also has a considerable impact on the valves. Here is some knowledge about exhaust brakes: 1. The principle of exhaust braking: Exhaust braking transforms the engine, originally a power output device, into an air compressor, turning it into a power-consuming device. 2. The concept of exhaust braking: Exhaust braking involves installing a regulating valve on the engine's exhaust pipe. By closing this valve, the pressure formed by the exhaust is increased, and the resulting negative pressure is used to obtain braking force. The exhaust brake is generally activated by a manual switch. To prevent the engine from stalling when stopping and to avoid exhaust braking during fuel injection, the exhaust brake is automatically released when the accelerator pedal or clutch pedal is pressed.
I've been driving trucks for decades, and the exhaust brake is something you can't leave on all the time—it can easily cause problems. I remember one time I forgot to turn it off, and the truck felt particularly sluggish, the engine was humming, speed wouldn't pick up, and fuel consumption shot up. Later, a mechanic told me that keeping the exhaust brake on for too long puts excessive strain on the exhaust system, damages the valve seals, and can even shorten the engine's lifespan. It's fine to use on normal roads, but over time, the truck will become less smooth, lose power, and feel sluggish. Before every trip, I make sure to check the switch position, ensuring it's only turned on when needed—protecting the truck, saving money, and peace of mind. Driving habits are crucial; developing good switching habits can prevent a lot of trouble and reduce maintenance frequency.
