Especially during long night rides, when we lean our heads against the bus window and feel somewhat tired. we hear a buzzing sound and this sound strangely gives us peace. We fall asleep with the sound echoing in our ears.

There are even 1 hour long videos on YouTube with just this sound. your voice what sound is it We don’t know if you’ve ever doubted it before, but if it aroused your curiosity when you read the title, let us take you to the details of its contents.

Let us remind you for those who do not understand the sound:

The operating principles and components of passenger cars and large vehicles such as buses and trucks generally differ from each other.

braking system for cars

If we give an example of the difference between small cars and buses; Trucks are generally used to drive heavy loads. special braking systems While small cars use standard braking systems.

This is what we don’t hear in our private vehicles. The reason for the noise we only hear during bus trips is In fact, it arises from just such a difference.

Understanding the difference between the braking systems in buses and small vehicles will also help us understand the source of the hum.

retardant

As we just mentioned, cars have a lower weight than buses. disc or drum A relatively simpler braking system is used. Vehicles such as trucks or buses also have different braking systems, namely “primary” and “secondary”.

The system we call ‘primary’ is actually a combination of brake pads and brake discs, just like in our cars. by the friction principle It works. The system we call “secondary” includes exhaust brake, engine brake and hydraulic retarder, etc. cover systems. These secondary braking systems are called retarders.

What is this retardant and what does it do?

The noise we hear on buses, which creates an ‘ASMR’ effect and puts us to sleep, means the retarder is working. Retarder that causes delay, It kind of supports the braking power. In fact, the origin of the word means “slow down.”

We can also explain it this way; It reduces wear and extra costs by using fewer brake pads, of steep slopes They provide safety by avoiding the risk of releasing the brakes when descending, and because the intensity can be adjusted by the driver, they can also adjust the torque control at different levels.

Now that you know the source of the noise, you can fall asleep more peacefully by listening to the buzzing sound…

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