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Steering Gear - TM-5-4210-220-12_50
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Rear Brake System
TM 5-4210-220-12 1-17.    BRAKE  SYSTEM.    Air  pressure  to  operate  the  service  and  emergency  brakes  is  supplied  from  the  primary, secondary,  and  emergency  reservoirs.    During  normal  operation,  air  in  the  primary  system  is  used  to  apply  the  rear brakes and air in the secondary system is used to apply the front brakes and release the parking brakes. a.  Parking Brakes. (1)    To  release  the  parking  brakes,  the  control  (A),  (see  fig.  1-30)  is  pushed  in    Air  from  the  secondary reservoir flows from the control valve via the spring brake valve, double check valve and quick release valve to the rear brake  air  chambers.    To  engage  the  brakes,  the  control  (A)  is  pulled  OUT  to  depressurize  the  parking  brake  air  lines. When these lines lose pressure, the quick release valve opens and vents the brake air chambers to the atmosphere.  As the air pressure is relieved, spring pressure from the spring chambers engages the brakes. (2)    If  the  secondary  air  supply  is  depleted,  the  brakes  can  be  released  by  pressure  from  the  emergency reservoir.  By pushing and holding the control (B) IN, the secondary reservoir is isolated and the emergency reservoir is opened to pressurize the system. Figure 1-30.  Parking Brake System 1-36

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