Lesson 2/Learning Event 1
LESSON 2
AIRHYDRAULIC BRAKE SYSTEMS
TASK
Describe the principles, construction, and operation of airhydraulic
brake systems.
CONDITIONS
Given information on the purpose, components, operation, and
inspection of airhydraulic brake systems.
STANDARDS
Answer 70 percent of the multiplechoice test items covering
fundamentals of airhydraulic brake systems.
REFERENCES
TM 98000
Learning Event 1:
DESCRIBE THE COMPONENTS OF THE AIRHYDRAULIC BRAKE SYSTEM
INTRODUCTION
Most passenger cars and lightduty trucks have the straight hydraulic
brake system which uses only the energy that is applied to the brake
foot pedal. This type brake does a good job on lightduty vehicles,
but medium and heavyduty vehicles require a better braking system.
The Army's 2 1/2ton and some 5ton tactical design trucks have air
hydraulic brakes. Airhydraulic brakes have hydraulic and compressed
air systems. The hydraulic systems of straight hydraulic brakes and
airhydraulic brakes are about the same. The compressed air system
supplies air pressure to boost the hydraulic pressure to the wheel
cylinders above the amount supplied from the master cylinder.
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