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BRAKE RESET (Anchor Lock)
TM 5-4210-230-14&P-1 VEHICLE OPERATION BRAKE ANTILOCK MONITOR (Warning) LIGHT A  satisfactory  antilock  system  is  indicated  each  time the   ignition   key   switch   is   turned   to   either   "ON"   or   "RUN" position with the antilock warning light momentarily illuminating, followed by the light going out and remaining off. If  the  warning  light  should  remain  "ON"  a  problem  is indicated in the antilock control system.  Should this condition occur, the service brakes will function in the normal manner; however,   the   vehicle   will   not   have   the   added   safety   and advantage of the antilock. If the antilock warning light comes on and stays on, the antilock    system    should    have    an    "Ignition    Cycle    Check" performed to determine if all or any computer modules and air control valves are operating satisfactorily.  Refer to VEHICLE MAINTENANCE   "Brake   Antilock   System"   for   Ignition   Cycle Check. As  the  vehicle  is  driven  about  24  km  (15  mph)  the antilock warning light should remain "OFF".  If the light should come  "ON"  and  remain  on  above  24  km  (15  mph),  a  wheel sensor problem may exist.  Excessive spin on one drive wheel relative  to  the  other  on  some  axles  may  cause  the  monitor light to go "ON".  To correct this condition, the ignition switch must be turned "OFF" and back "ON" to reset the system and correct the condition. If wheel spin is not the cause of the light remaining on, one  or  more  of  the  sensors  could  be  the  problem.    Refer  to VEHICLE  MAINTENANCE  "Brake  Antilock  System"  for  quick trouble shooting of antilock system. BRAKE PEDAL When making a stop for a traffic light or going down a long grade, do not "fan" the air brake pedal as this wastes air pressure.      On   long   grades,   use   snubbing   "on-off"   brake application to reduce the possibility of extreme heat and wear to  the  brake  lining.    A  good  policy  to  follow  is  to  downshift your   vehicle   on   long   grades   to   obtain   maximum   engine assistance in reducing vehicle speed.  The best way to make a stop is to apply the brakes as hard at first as the road and load   conditions   will   permit   and   then   gradually   reduce   the pressure, so that at the end of the stop there is sufficient air pressure to hold the vehicle. BRAKES PARKING If   both   air   systems   fail   or   are   depleted   the   spring brakes apply. To release, repair air leak and recharge system to 483 kPa (70 psi).  If leak cannot be repaired and the vehicle must be moved, the spring brake must be manually released. CAUTION To  avoid  personal  injury  or  property  damage when  manually  releasing  the  spring  brakes, be  sure  to  block  the  wheels  so  that  vehicle cannot  move  when  the  brakes  are  released. For towing, make sure the vehicle is connected  or  secured  to  tow  vehicle  before releasing the spring brakes. BRAKE RELEASE (Parking) ANCHOR LOK SPRING BRAKE In the event it is necessary to move the vehicle after an emergency  application  (before  air  pressure  can  be  restored), the emergency parking spring can be compressed mechanically  to  release  the  brake.    A  release  stud  "spring caging  tool"  is  furnished  with  the  brake  chamber  assembly. The release stud engages in the spring pressure plate and its nut is tightened to compress "cage" the spring and release the brake. Apply a light coat of Never Seeze to the threads of the release  stud  to  avoid  any  unnecessary  wear  of  the  threads. Remove the access plug from the end of the spring chamber. Insert  the  release  stud  through  the  opening  in  the  chamber and into the spring pressure plate. Turn the release stud 1/4 turn to engage the tangs on the release stud into the slot in the pressure plate.  Install the nut on the release stud.  Be sure tang on release stud stays engaged  with  slot  on  pressure  plate  while  installing  the  nut. Tighten the nut with a wrench to compress the spring. 2

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