How Does the Brake System Work in a Semi-Truck?

The brake system of a semi-truck is one of the most important components that ensures safe road operation. It plays a critical role in slowing down and stopping the vehicle, especially when you are carrying a heavy load. Understanding how the brakes work in a semi-truck is essential for both truck drivers and mechanics alike as it helps them to maintain and repair their vehicles.

The brake system of a semi-truck consists of two main components: the air brakes and the hydraulic brakes. The air brakes use air pressure to create friction between two surfaces, while hydraulic brakes use hydraulic pressure to do the same. Both systems are connected to each other, with the air brakes being used for primary braking and the hydraulic brakes providing additional stopping power.

The air brakes are powered by an on-board compressor that supplies pressurized air to the brake system. The compressor takes in filtered ambient air and increases its pressure before sending it out into the brake system. This pressurized air is then used to activate various components such as the wheel cylinders, which push out pistons that press against brake pads or shoes located on either side of the wheel drum.

The hydraulic brakes are activated by hydraulic fluid, which is supplied by an on-board pump. The pump takes in low-pressure fluid from a reservoir tank and increases its pressure before sending it out into the brake system. This pressurized fluid then activates various components such as wheel cylinders, which push out pistons that press against brake pads or shoes located on either side of the wheel drum.

Conclusion

The brake system of a semi-truck is made up of two main components: an air braking system and a hydraulic braking system. These two systems work together to provide powerful stopping power for a heavy vehicle like a semi-truck. Understanding how these systems work is essential for truck drivers and mechanics alike so that they can properly maintain and repair their vehicles.

Photo of author

Karen Watkins