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MASTER CYLINDER
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WHEEL CYLINDERS - TM-5-4210-230-14P-1_382
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 The  master  cylinder  (Fig.    2)  is  not  equipped  with  a residual   check   valve.      The   valve   is   located   in   the   power cylinder when this master cylinder is used. Inspect  the  master  cylinder  at  the  time  of  making brake adjustment for correct fluid level. Fluid should be within 6.4 to 12.7 mm (1/4 to 1/2") from the top of the filler neck.  Do not fill the supply reservoir to the top of the filler neck. When removing the supply reservoir filler cap, extreme care must be used   to   prevent   dirt   or   moisture   from   entering   the   master cylinder. POWER CYLINDER The    power    cylinder    assembly,    whether    it    be    a vacuum   power   booster   or   a   compressed   air   booster,   is designed  to  supplement  the  usual  manual  brake  operation. The  power  brake  units  often  appear  different  in  shape  and arrangement    and    internal    components    may    also    appear different;   however,   all   function   in   the   same   manner.      The operating   force   is   controlled   by   a   valve   mechanism   and exerted   against   a   stroking   device   which   converts   it   into pressure for braking. Figures  3  and  4  illustrate  two  typical  type  vacuum power   units.      Complete   detailed   instructions   pertaining   to operation,  description  and  overhaul  for  a  particular  unit  may be found elsewhere in this service manual. Fig. 3.  Vacuum Power Cylinder Fig. 4.  Vacuum Power Cylinder RESIDUAL CHECK VALVE The residual check valve (Fig.  1), item L) maintains 41 to 124 kPa (6 to 18 psi) hydraulic pressure in the hydraulic system beyond the master cylinder to provide sealing of wheel cylinder piston cups with released brakes. The valve isolates a momentary vacuum which may occur in the master cylinder. This  pressure  will  not  cause  the  brake  shoes  to  drag,  as  the shoe  return  springs  overcome  the  residual  pressure  in  the hydraulic system. During  manual  bleeding  the  valve  assists  pumping fluid through the system by closing every time the brake pedal is   released.      If   the   valve   should   fail   to   hold   the   residual pressure, a very small leak or even road shock over a period of  time  could  cause  increased  pedal  stroke  and  a  spongy pedal feel. The residual check valve action can be inspected by cracking   a   bleeder   screw   open.   A   small   spurt   of   fluid   will indicate residual pressure. On    vehicles    equipped    with    certain    type    power cylinders,  the  check  valve  is  located  in  the  power  cylinder slave cylinder tube; where this is the case, no check valve is used in the master cylinder.  (Refer to power cylinder section specifications for the particular unit involved.) CTS-2055S  Chapter II Page 4 PRINTED IN UNITED STATES OF AMERICA

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