How 18 Wheeler Air Brakes Work

Anyone who has ever driven a commercial truck, bus, trailer, or semi-trailer understands that air brakes are often utilized. This is often for a very specific reason, as the nature of an air brake system allows for increased reliability and efficiency. Understanding how 18-wheeler air brakes work can provide insights into their superior performance.

The major advantage is that air is an infinite resource and will never run out; because of this, with a leak, the system is still functional and does not need to be replenished. Additionally, research will also show that air brakes allow multiple vehicles to be coupled. Thus, when all of the units must break, it can also mean that this can be controlled from inside the cab.

Heavy trucks are also notable for using a dual air brake system, which is comprised of two air brake systems combined, yet only has one set of brake controls. This allows for the ability to retain braking, even if one of the systems fails. Additionally, there is the ability to ensure a steady supply of compressed air, which, as mentioned, ensures the braking system remains operational regardless of the circumstances.

All of these measures work to ensure that safety is maintained. As one can imagine, when operating a heavy vehicle, braking can often mean that one is spared from an accident, which not only affects the driver of the heavy vehicle but also other drivers on the roadway as well.

3 main Types of Air Brakes

One should also be aware of the three types of brakes:

Service Brakes: Not only are service brakes activated when they are supplied with air, but they are also activated whenever the driver pushes down on the brake pedal. Once the air is pushed through the brake chamber, a pushrod is forced out, which then pushes a slack adjuster. This then turns the camshaft, which twists the S-Cam and forces the brake lining to make contact with the brake drum. Due to the friction, the vehicle is then forcibly slowed.

Spring Brakes: These brakes are typically utilized in order to meet parking and emergency brake standards. While driving, springs are held back by a great deal of air pressure. When pressure is then removed, the springs put on the brakes. Remember, it is important to know that these brakes are different than service brakes. Generally, when these brakes are released, this is done through approximately 60 psi.

Emergency Brakes: These brakes are contained within a steady stream of airflow inside the brake chamber. Additionally, this also holds a spring, which is kept restrained by the air system. When this air in the system is not of a viable quantity, the spring, and by default the brakes, will automatically engage. Typically, this is done when there is a drop of 20-45 psi.

When driving heavy vehicles, it is crucial to understand how these mechanisms work to ensure all components operate efficiently. When these mechanisms do not work correctly, it can not only cause the braking system to work incorrectly, but could also potentially cause accidents in various degrees of severity. Some of the worst truck accidents in Texas occur when the brakes are out of service or the driver is not paying attention to traffic ahead.

Contact a Texas Truck Accident Lawyer for Help

If you or a family member has been injured in a large truck accident, call the Texas truck accident attorney Greg Baumgartner.

281-893-0760

Source:

https://www.easternmarine.com/tech-info/how-air-brakes-work

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About Greg Baumgartner

Greg Baumgartner is a preeminent rated personal injury lawyer based in Houston, Texas, with over three decades of experience representing severely injured clients in truck accidents. He founded Baumgartner Law Firm, in 1985, with a mission to provide excellent legal representation and personalized attention to every client.