Semi Truck Air Brake Systems
Semi Truck air brake systems is a really important part in the truck we are talking about safety and this the is inspiration to write to you today about the very fundamentals of air brake systems and the very basic information that you should come out of an air brake course. With one of the things that the students of Truck Driving School Houston, TX always struggled with in terms of air brakes, is trying to explain to students that there are two power sources in an air brake system. An air brake system works exactly the same as the brakes on your car or light truck break. In your light car or truck our hydraulic brakes. In other words, it’s hydraulic pressure fluid that activates the brakes.
Main Truck Brakes
Also, there is a parking brake and there is an emergency brake on your vehicle. Now
Semi Truck Air Brake Systems
Semi Truck air brake system, and hydraulic systems are named after their power source. The power source that applies the service brake, is the foot pedal that you apply the brakes going up and down the road, and there have always struggled with that because the air brake systems that confuse students, because they have something on air brake systems that are called spring brakes and it leads students to believe that there is a different braking apparatus on the air brake system, in agreement with what we are saying here, some people believe that there are spring brakes or something else other than air brakes on an air brake system.
Semi Truck Air Brake System
We would like you to let us know if you were confused by being called air brakes and spring brakes. In this text, we are going to try to unravel that mystery for you and explain the fundamentals of what you need to know in an air brake system. When you arrive at your course to earn your class A, CDL license at Truck Driving School Canyon Lake, TX, you will have that important information for drivers. Now we are talking about the very basic information that you need to know when you come to our air brake course.
Types of brakes
There are three brake types on your vehicle. You have a service brake which is the foot pedal when you go up and down the road, you apply the foot pedal and the vehicle comes to slow down or stop.
Semi Truck Air Brake Systems
is used most of the time, 99.9% of the time. All systems are divided into independent subsystems, so it’s unlikely that braking systems regardless whether it’s hydraulic braking system or an air brake system are going to fail, Service brake is the foot pedal.
The next brake that you have on your vehicle is the parking brake, and I know here in North America, 85% of us, in normal cars, drive automatic transmissions and of these people who drive automatic transmissions 90% of those people never use the parking brake, but there is a parking brake your vehicle and Truck Driving School Houston, TX would strongly suggest that you apply it after you put the vehicle in the parking. Is hard on your transmission when you don’t apply the parking brake.
Now, if the service brakes fail in a normal car. The foot pedal fails and you don’t have brakes going up and down the road, you can pull the parking brake on using the power from your body and the lever is attached to a cable to the brakes on the back and bring the vehicle to a stop. Now you’re using the parking brake as an emergency brake.
So the three systems on your normal vehicle are service brakes the foot pedal. The parking brake switch. The energy comes out of you as you pull up on the ratchet mechanism or push the ratchet pedal down on the floor and if the service brakes fail you can use the parking brake to bring the vehicle to a stop, and thus the parking brakes become the emergency brake.
At Truck Driving School Houston, TX we want you to be very clear about this: They are called hydraulic brakes because that’s the power source for the service breaks air brakes work exactly the same and what confuses students on air brake systems is that we have something on air brake systems, that has been referred to for almost 40 years, now calling spring brakes, spring brakes, only serves to confuse students.
All that spring brakes are as another power source on an air brake system. On an air brake system, we have service brakes which is the foot pedal and it applies the brakes on the vehicle using air pressure. Thus they are air brakes like hydraulic brakes are called hydraulic brakes on your car or light truck because of their power by hydraulic pressure.
2 Buttons On The Tractor
We also have parking brakes on large commercial vehicles. In these do in fact have to be applied every time you leave the seat. There is no doubt about that. Apply the parking brakes. As you will see in Truck Driving School Houston, TX when you will enter the truck, there are two buttons on the tractor unit is a red one and a yellow one.
The yellow is the parking brake control valve. The red eight sided button is the trailer air supply valve and those are on-off switches and they apply the parking brakes on-off now. The difference between a big truck or commercial vehicle that is equipped with air brakes or an RV unit for that fact is that the parking brakes are powered by large powerful springs.
These large powerful springs are another power source that applies the parking brakes and their best use for parking. Now what happens is we are going up and down the road and lose the service brakes on an air brake equipped vehicle.
For Truck Driving School Houston, TX it is important that you know that the air drains down drains because what happens is when you push the buttons to release the parking brakes, air pressure compresses those large powerful springs. If you lose air pressure in the system though springs are no longer able to be caged or compressed, and because you don’t have enough air pressure to compress them.
They come on the challenge with all of these manuals either referred to these as spring brakes, and Truck Driving School Houston, TX students coming to class and try to explain this to them and they are all thinking either. Is there another brake on the truck commercial vehicle or the vehicle fitted with air brakes? No there isn’t. It’s simply one air brake chamber that converts air pressure into mechanical force and that applies the service brake the foot pedal and you got another one on the back of it.
Truck Spring Brakes
With this large powerful spring in it, that’s held released with air pressure, when you evacuate the air pressure from that spring brake chamber that large, powerful spring comes on and applies the same brakes. It’s the same as what’s on your car or light truck you are not using different brakes, you just using a different power source which is coming out of you via cable back to the brakes and pulling the brakes. At Truck Driving School Houston, TX we want you to always remember that on a big truck, the emergency and parking brakes are powered by these large powerful springs and held off by air pressure.
Both hydraulic system and an air brake system have service brakes, the foot pedal, when you go up and down the road. They have parking brakes that apply the brakes indefinitely. On your car, light truck, it’s just the cable with the ratchet mechanism like a boat. You click it up it locks the brakes and to place indefinitely large commercial vehicle when you evacuate the air from the system.
The large powerful springs come on and apply the brakes, the same brakes that the air brakes work going up and down the road. If you lose air pressure in a large commercial vehicle, a large vehicle (RVs and buses are also fitted with air brakes) if you lose the air pressure those large powerful springs will come on and apply the same brakes as all the other brakes so all the brakes.
The service brakes, the parking brakes, and the emergency brakes all use the same foundation brake system, whether it’s a drum brake or disc brake, so that is one of the things that in Truck Driving School Houston, TX think leads to confusion when students take air brake courses is that instructors say that all these air brakes in the spring brakes and students are thinking well there are two different kinds of brakes on the vehicle and no, there’s not, there’s one brake and there are two power sources.
Brakes for Different things
At Truck Driving School Houston, TX we want to reiterate that service brakes, the brake pedal parking brakes and emergency brakes, parking brakes and emergency brakes are one and the same thing there just used for different purposes and when they are used for different purposes, there are called different things. When you park the vehicle, they are called parking brakes, when you need to bring the vehicle to a stop because the brakes failed, they are called emergency brakes and hopefully, that clears up some of the confusion that you might have.Taking a CDL air brake course and if you’ve had that confusion and now you understand service brakes, parking brakes, emergency brakes are the same on hydraulic as on air brakes.