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BRAKES HYDRAULIC - TM-5-4210-230-14P-1_69
TM 5-4210-230-14&P-1 VEHICLE MAINTENANCE WARNING LIGHT ILLUMINATES WHEN VEHICLE IS OPERATED 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. Most common problems found with the sensors are: 1. Vehicle   brake   hang-up   and   slow   release   of   brakes (dragging brakes). 2. Loose-wheel   bearings   causing   excessive   exciter   ring runout. 3. Insufficient  voltage  output  of  sensor  or  shorted  sensor or sensor wires. 4. Improper  installation  of  wheel  and  drum  assemblies, could result in insufficient voltage output. IMPORTANT Do not rock the hub and drum when installing as the sensor may be pushed in too far.  Do not    forget    to    pull    the    sensor    out    to    its maximum outward travel (away from center of vehicle)  prior  to  installing  the  hub  and  drum assembly to assure that the sensor is properly adjusted. 5. Always   check   the   sensor   voltage   output   connector located at some point on the axle after performing any maintenance to brakes, wheel bearings or wheel seals. A   volt-ohm   meter   can   be   used   for   sensor   voltage output check at sensor connector by spinning the wheel about   one   revolution   every   two   seconds.      Voltage should not be lower than .3 volt. IGNITION CYCLE ANTILOCK SYSTEM To  ignition  cycle  the  antilock  system,  turn  the  ignition switch   "ON"   to   "OFF"   several   times   prior   to   starting   the ignition cycle check.  Then with at least 552 kPa (80 psi) air in system, apply the brakes and turn the ignition switch to "ON" position.  This allows all air valves to exhaust a small amount of air.  Continue to turn the ignition switch "ON" to "OFF" with the brakes applied until all computer modules and air control valves have been  checked.    An  assistant  will  be  required  to  listen  for  the exhaust of air at each axle air control valve. BRAKE ADJUSTMENT A  regular  schedule  for  periodic  cleaning,  lubrication, adjustment  and  inspection  should  be  established,  based  on the type of vehicle operation.  It is difficult to predetermine an exact  maintenance  interval  (time  or  mileage)  since  vehicles will be used in a wide variety of operational applications and conditions. Periodic     checking     of     push     rod     travel     or     brake adjustment  is  essential  for  good  braking.    Push  rod  travel should be checked every 3,000 km (2,000 miles) to determine if adjustment is necessary.  Push rod travel should be kept at a minimum without brakes dragging. Inspect brake lining every 19,000 km (12,000 miles) or every  12  months;  whichever  occurs  first.    When  brake  lining or  blocks  are  worn  to  within  1.6  mm  (1/16")  of  rivets,  brake lining must be replaced. This inspection or adjustment should only be performed   by   qualified   service   personnel   and   must   be   in accordance with instructions provided by International Harvester Co. Do  not  back  off  front  brakes  so  that  they  are  not  as aggressive,  letting  the  rear  brakes  do  all  the  stopping  of  the vehicle.      Do   not   overlook   the   brakes   on   the   trailer   either. Brake  balance  on  trucks  and  tractor  trailers  is  essential  for good braking and minimize cycling of the antilock. Too much lining-to-drum clearance will require more air to be delivered to each of the brake chambers since a longer stroke of the chamber is required.  Improper brake adjustment on an axle (one brake group adjusted properly and the brake group on opposite side of vehicle backed off) will result in an antilock  cycle  since  one  brake  group  will  tend  to  lock  up  or slow  down  more  rapidly  than  the  other.    This  cycling  of  the antilock   will   tend   to   increase   the   stopping   distance   of   a vehicle. 2

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