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DESCRIPTION - TM-5-4210-230-14P-1_374
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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HYDRAULIC BRAKE FLUID
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 4. Check    cup    clearance    of    compensating    port    by watching for surge of fluid in reservoir when pedal is depressed. 5. Internal  wear  or  leaks  are  indicated  by  pedal  fading away  under  steady  foot  pressure  (also  sign  of  leak elsewhere in system). 6. To   check   residual   check   valve   operation,   depress and  release  brake  pedal.    Open  bleeder  valve  and check for spurt of fluid indicating pressure in lines. STOP LIGHT SWITCH If  stop  lights  are  inoperative,  it  would  indicate  either defective bulbs, defective switch, loose or broken connections or switch improperly positioned. BRAKE LINES, FITTINGS AND HOSES 1. Check lines for kinks, dents or rupture. 2. Check hoses for abrasion, kinks, soft spots, rupture, collapse, cracks, twists or loose frame supports. 3. Examine all connections for leaks. 4. Carefully  check  for  incomplete  ruptures  indicated  by a  bubble  between  the  plys  of  the  flexible  hose  or  a torn inner line (Fig.  1). Fig. 1.  Flexible Hose Damage 5. Brake  line  fittings  will  sometimes  become  rusted  or corroded to the wheel cylinder and/or brake line.  Be careful  not  to  twist  the  line  causing  a  line  fracture during removal or installation.  Brake line open ends should  be  capped  to  prevent  the  entrance  of  foreign material. Fig. 2.  Use of Tube Nut Wrench Fig. 3.  Protecting Fitting Against Damage During Removal or Installation Always   use   correct   type   and   size   of   wrench   on fittings (Fig.  2). Avoid damage to female fittings by supporting fitting with  a  spare  tube  nut  during  removal  or  installation (Fig.  3). 6. Use  only  steel  tubing  when  replacement  is  required. Use  old  tubing  as  a  pattern  for  forming  and  routing the new.  Avoid kinks and sharp bends when forming tube.      Use   tubing   cutter   to   cut   tubing   to   required length making allowance for flare at each end of the tube. Assemble  tube  nuts  on  tubing  before  flaring.  After flaring tube, blow out with air pressure to remove any particles of dirt or chips. Do not discard old tube nuts until you are certain that new ones are available. WHEEL CYLINDERS Pull    back    rubber    boots    and    check    for    leaks.    If cylinders are disassembled, look for dirt, corrosion or pitting. CTS-2055S  Chapter 1  Page 4 PRINTED IN UNITED STATES OF AMERICA

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