how does a jake brake work on a tractor trailer

A jake brake is a crucial component of a tractor trailer that aids in slowing down the vehicle by using the engine's power. It is an essential safety feature that is designed to prevent accidents on the road. With the help of this braking system, drivers can reduce the speed of their heavy trucks easily, even on steep inclines. In this article, we will be discussing how a jake brake works on a tractor trailer.

The Function of Jake Brake

The primary function of a jake brake is to slow down the speed of a tractor trailer by using the engine's power. Unlike conventional brakes that use friction to slow down the wheels, the jake brake releases the pressure inside the engine's cylinders to decelerate the vehicle. When a driver steps on the brake pedal, the jake brake activates and opens the exhaust valves. This allows the high-pressure air in the engine to escape, which puts a force on the engine's pistons and slows down the truck. The process takes place in a fraction of a second, reducing the speed of the vehicle smoothly without putting much stress on the conventional braking system.

The Mechanism of Jake Brake

A jake brake works by using the same principles that make an internal combustion engine run. In a normal diesel engine, fuel is injected into the cylinder, compressed, and ignited through heat generated by the compression process. In contrast, a jake brake uses the compression stroke to slow down the engine. The mechanism consists of an actuator that is controlled by the driver through a switch on the steering wheel. The actuator applies pressure to the pushrods in the engine, which then open the exhaust valves during the compression stroke. This creates a back pressure inside the engine that helps to slow down the truck.

Benefits of Jake Brake

The jake brake is a valuable safety feature that provides several benefits to truck drivers. Firstly, it significantly reduces brake fade and prolongs the life of the conventional brakes. Secondly, it helps to prevent overheating of the brakes, which is a common problem in heavy trucks. Thirdly, it improves the overall braking performance of the vehicle by providing additional stopping power. Finally, it allows drivers to slow down their trucks on steep descents, reducing the risk of accidents.

Conclusion

In conclusion, a jake brake is a critical safety feature that plays a crucial role in slowing down a tractor trailer. The mechanism uses the engine's power to provide additional stopping power, improving the braking performance of the vehicle. It prolongs the life of the conventional brakes, reduces the risk of accidents, and prevents overheating. Therefore, it is a must-have component that every truck driver should have in their vehicle.