School Bus Air Brakes

About this activity

Air Brake System FMVSS 121

Created by

Brenda Rios

United States

Download the paper version to play

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1	Brenda Rios December 8, 2025	% 100	02:16

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School Bus Air BrakesOnline version Air Brake System FMVSS 121 by Brenda Rios 1 GOVERNOR - I decide when it’s time to work harder or take a break. When tanks are full, I stop the compressor. When the tanks get low, I make it pump again. 2 AIR DRYER - I remove moisture and oil from the air before it reaches the tanks. I live between the compressor and the first reservoir. 3 COMPRESSOR - I breathe air in, squeeze it tight, and send it to storage. Without me, nothing else works. 4 FRONT SLACK ADJUSTER - I connect the brake chamber to the foundation brakes. I must have the correct free play, or your brakes won’t stop you safely. 5 SUPPLY/WET TANK - I’m the first tank to receive air from the compressor. I collect moisture, oil, and dirt. Air passes through me before going anywhere else. 6 FRONT TANK - Secondary Air System. It stores air for the front service brakes, which help balance stopping and stability. 7 FRONT BRAKE CHAMBER - I turn air pressure into mechanical motion. I push rods that make the wheels slow down. 8 REAR TANK - Primary Air System. It stores air for the rear service brakes, which do most of the braking force on a school bus. 9 SPRING BRAKE ACTUATOR - I apply automatically if the system loses too much air between 20 and 45 psi. 10 REAR BRAKE CHAMBER - I turn air pressure into mechanical motion. I push rods that make the wheels slow down. 11 FRONT PUSH ROD - 12 TWO WAY VALVE - I have two air sources feeding me. If one system fails, I switch to the other so the brakes still work. 13 SINGLE CHECK VALVE - I only allow air to move in one direction. If air tries to come back toward me, I shut it off. I stop pressure from flowing backward. 14 DRAIN VALVE - I let water and oil out of the air tank. I’m not used all the time, just when needed to keep air clean. 15 SPRING BRAKE CONTROL VALVE - I control the air going to the spring brakes. I’m not used all the time only when parking or in emergencies.

School Bus Air BrakesOnline version

Air Brake System FMVSS 121

1 GOVERNOR 2 AIR DRYER 3 COMPRESSOR 4 FRONT SLACK ADJUSTER 5 SUPPLY/WET TANK 6 FRONT TANK 7 FRONT BRAKE CHAMBER 8 REAR TANK 9 SPRING BRAKE ACTUATOR 10 REAR BRAKE CHAMBER 11 FRONT PUSH ROD 12 TWO WAY VALVE 13 SINGLE CHECK VALVE 14 DRAIN VALVE 15 SPRING BRAKE CONTROL VALVE

You can integrate the game into an LMS compatible with LTI 1.1 or LTI 1.3 such as Canvas, Moodle, or Blackboard. This way, the scores will be automatically saved into the platform’s gradebook.

School Bus Air Brakes

Map Quiz

About this activity

Created by

Download the paper version to play

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School Bus Air BrakesOnline version

by Brenda Rios

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