TM 9-2320-273-20
Section XXIII BRAKE SYSTEM
2-61. INTRODUCTION.
The brakes on all M915 thru M920 vehicles are actuated by the compressed air system
(para 2-60).
The system is comprised basically of valves and controls for dual air brakes (service and emergency).
“S’’- type cam brakes with two air chambers are used in the rear on all models and on the pusher
axle (Models M917, M919 and M920). Wedge-type brakes with one air chamber (M916 thru M920)
or two air chambers (M915 only), are used in the front. (See illustration and description of each
type of brake in paragraphs 2-65 thru 2-70).
(Refer to section XXIV for description of auxiliary air powered systems.)
This section is divided into three parts: controls, switches and indicators, and system components.
Since the number of air reservoirs and the arrangement of valves and lines differs with each vehicle
model, a separate arrangement drawing is provided for each in paragraphs 2-65 thru 2-70. (See
Appendix D for a piping schematic diagram of each vehicle model.)
2-68
