TM 9-2320-272-10
1-20.
COMPRESSED AIR AND BRAKE SYSTEM OPERATION (Contd)
d.
Spring Airbrake System Operation.
The spring airbrake system applies rear brakes when vehicle parking brake is applied or in event of a major
brake failure. The spring brake is located on one of the two service brake chambers at each rear wheel. Major
components of the spring airbrake system are:
A
SPRING BRAKE WARNING LIGHT SWITCH - Activates warning light when spring brakes are engaged.
B
SPRING BRAKE RELEASE CONTROL VALVE - Pushed in to release spring brakes independently of mechanical
parking brake. Control is also used to release spring brakes in order to test and adjust mechanical brake.
C
DOUBLECHECK VALVE #4 - Allows spring brake air pressure to come from either release control valve or spring
parking brake valve directly to doublecheck valve #3.
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