Quantcast Figure 1-32.  Rear Brake System - Secondary Air Only

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Rear Brake System
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Front Brake System
TM 5-4210-220-12 1-17.  BRAKE SYSTEM.  - Continued (5)    If  the  primary  system  becomes  depleted  of  air,  the  secondary  system  is  indirectly  used  to  apply  the  rear brakes.  The shift from primary to secondary air is automatic and carried out in the spring brake valve when the brakes are applied. (6)  Normally, primary air pressure, supplied via the relay valve, keeps the secondary (control) air supply port in the spring brake valve closed.  This action keeps the valve function neutral. (7)  With no primary air available, secondary air pressure causes the spring brake to partially close and reduce the air pressure that keeps the parking brakes disengaged, (see fig. 1-32).  When this occurs, the quick release valve automatically  opens  and  momentarily  vents  the  air  chambers  to  the  atmosphere.    The  reduction  in  pressure  in  the  air chambers is proportional to the secondary air pressure applied to the spring brake valve. Figure 1-32.  Rear Brake System - Secondary Air Only 1-38

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