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Home > Ordnance Documents and other related manuals > > Lesson 2. Air- Hydraulic Brake Systems
Answers to Practice Exercise - OD10080078
Typical Brake System

Wheeled Vehicle Braking Systems
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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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