TM 9-2320-272-10
1-20.
COMPRESSED AIR AND BRAKE SYSTEM OPERATION (Contd)
A
FRONT EMERGENCY COUPLING - When vehicle is being towed, coupling receives compressed air from towing
vehicle’s brake system to charge its own brake system.
B
PRIMARY AIR RESERVOIR - Stores sufficient air pressure to allow operator to make normal brake applications,
should system pressure fail or engine stall.
C
PRIMARY FEED CUTOFF - Manually-operated valve used to isolate pressure leaks in primary air system from
draining wet tank (para. 3-12).
D
PRIMARY AIR RESERVOIR CHECKVALVE - Presents backflow of air from primary tank if wet system develops
a leak.
E
SECONDARY FEED CUTOFF - Manually-operated valve used to isolate pressure leaks in secondary air system
from draining wet tank (para. 3-12).
F
SECONDARY AIR RESERVOIR CHECKVALVE - Prevents backflow of air from secondary tank if wet system
develops a leak.
G
REAR EMERGENCY COUPLING - When towing another vehicle, coupling allows pressurized air from wet tank to
charge towed vehicle’s wet tank.
H
SECONDARY AIR RESERVOIR - Stores enough air pressure in case constant pressure system fails or engine
stalls. The operator can make normal brake application before running out of air.
I
PRESSURE PROTECTION VALVE - Performs two functions:
•
Allows air pressure to build to 60-65 psi (414-448 kPa) before supplying air to auxiliary air-powered
equipment.
•
Closes off auxiliary air system from other systems if an accessory fails and prevents loss of air from
secondary reservoir.
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