TM 9-2320-272-10
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COMPRESSED AIR AND BRAKE SYSTEM OPERATION (Contd)
(2)
The primary constant pressure system is made up of the following components:
A
PRIMARY AIR PRESSURE GAUGE - Indicates amount of air pressure in primary system.
B
LIMITING VALVE - Serves three functions:
•
Regulates signal air pressure going to front brake chambers so rear brakes are applied first.
•
Regulates signal air pressure to front brake chambers so operator has control over amount of braking.
•
Releases air pressure in front brake chambers directly to vent in the valve when brake pedal is released.
C
RONT BRAKE CHAMBERS - Converts air pressure to mechanical force which applies front service brakes.
D
PRIMARY RESERVOIR LOW AIR PRESSURE SWITCH - Activates warning buzzer and warning light when air
pressure goes below 60 psi (414 kPa).
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