No Engine Brake Sign Meaning (All You Need To Know)

A no-engine braking road sign gives a warning to truck drivers not to use the engine to brake. Truck drivers are usually downshifting the engine to slow down the tuck even without the brakes. This is called engine braking. 

And it produces a loud noise. Some towns and cities are usually putting up a “no engine braking sign” to encourage the drivers to use the brake pedals and not the engine brake. An engine braking refers to slowing down the vehicle by using a retarding force in an engine instead of magnetic or friction brakes. 

The braking force is made by the manifold vacuum made by insufficient air. As a result, the reduction of energy in the engine will slow it down. If you release the gas pedal, you will reduce throttle, and it will make a vacuum inside your engine, which increases the resistance and then lowers the vehicle’s speed if you shift into a lower gear.

In contrast, engine braking, the tendency to slow down, will increase the engine braking effect. An engine braking effect is more exposed on the manual transmission, but it can also be utilized with automatic transmission. 

This article will talk about the no-engine braking sign and what it means. Let us start. 

No Engine Brake Sign Meaning

What Does The No Engine Brake Sign Mean?

The meaning of no engine brake is not specific. A car driver would want to slow down and proceed as if they are stopping on the brake, but their braking pads wear out. The engine can be forced to slow down, and they might want to reduce the engine speed or the engine brakes. 

It is known as engine braking and can make a loud noise. Some cities and towns have put signs that are saying that brake pedals are preferred and not engine brakes to encourage trucks to brake on foot, as a result of engine braking that is making a great deal of noise. 

What Does No Engine Brake Mean On The Highway?

A supplementary braking system is provided on heavy vehicles to assist the regular service brakes in maintaining safe speeds traveling down the hill. There are three types of supplementary braking systems. First is the exhaust brakes, the device that intermittently blocks the exhaust to make back pressure on the engine. 

There are also the engine brakes, a device releasing compressed gasses from the engine. The last is the retarders, an electric or hydrodynamic system installed in the driveline. An engine brake is typically used on larger trucks where the exhaust brakes are standard on medium tracks. 

Unfortunately, many modern engines and exhaust brakes can include silencers and significantly cause a noise disturbance. In addition, some old heavy vehicles have silenced engine brakes that can produce noise disturbance.

No Engine Brake Definition

First, let us talk about the engine brakes. In braking, many car drivers think that the brakes are on their wheels and use friction to slow down and then stop the vehicle. The engine braking uses a force within the engine to slow down the vehicle. 

You can do this by releasing the accelerator pedal, which will restrict the airflow through the intake. In vehicles equipped with diesel engines, there is a compression release brake. This will open up the exhaust valves to create a force that will slow down the vehicle and help the drivers maintain control and the stability of the truck. 

How Common Is No Engine Brake Sign?

An engine brake system in large trucks that are using the engine’s power to slow down the vehicle. These systems are more effective in slowing vehicles down than the traditional friction brakes, but they can be very loud. Many municipalities have banned engine braking if it is near residential areas. 

One common form of engine braking is the jake brake. It is a system that opens the compression valves inside the engine. This will let out a compressed gas in the cylinders. 

This will slow the vehicle substantially. The gas will rush out if the valves are open and make a distinctive and loud chattering noise.

How To Get A No Engine Brake Sign?

People say not to let loud engine brakes disturb the peace. They said you could place one no-engine braking sign in your neighborhood so that they can keep the noise level to a minimum. Unfortunately, it is not specified where you can get enough engine brake signs.


In summary, many people are thinking about the meaning of a “no engine brake sign.” They also wanted to know what it meant and where they could use it. 

This article will tell you about the meaning of the no-engine brake sign. Read this article to know more.

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Image credits – Canva

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My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more