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MASTER CYLINDER AND WHEEL CYLINDERS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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MANUAL BLEEDING
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 3. When  new  thick  lining  is  installed,  cups  are  pushed closer together and must function over the roughened surface. 4. Since  cups  no  longer  seat  against  smooth  cylinder walls, they allow fluid to leak out. BRAKE PEDAL ADJUSTMENT When  the  brake  control  system  is  in  the  released position, the foot brake pedal should have 6.4 mm (1/4") free travel  (Fig.    1)  before  the  pressure  stroke  starts.    This  free travel is required to prevent blocking of the compensating port in  the  master  cylinder.    Brakes  will  drag  if  the  compensating port   becomes   blocked   due   to   pressure   building   up   in   the system.    Shorten  the  pedal  stop  rod  to  allow  the  piston  to uncover  the  compensating  port  allowing  fluid  to  escape  into the reservoir. Fig. 1.  Brake Pedal Free Travel BLEEDING BRAKE SYSTEM The  hydraulic  brake  system  must  be  free  of  air  to function  properly.    If  air  becomes  mixed  with  the  brake  fluid, loss  of  pedal  reserve  will  result  since  the  air  in  the  hydraulic system  compresses.    A  bleeder  valve  (screw)  is  provided  at each  wheel  cylinder  for  removal  of  any  air  in  the  hydraulic brake system. Bleeding the brake system consists of forcing brake fluid and any air in the brake fluid out of the hydraulic system at one or more bleed points. There are two methods of bleeding the hydraulic brake system; manual bleeding and pressure bleeding.  For either method of bleeding, a supply of clean hydraulic brake fluid is necessary.  Do not reuse brake fluid that has been drained from the hydraulic brake system, as the fluid may be contaminated or contain dirt. The order in which wheel cylinders are bled normally does  not  affect  the  quality  of  the  bleeding  operation.    The following  sequence  is  recommended,  however,  to  reduce  the possibility  of  missing  a  wheel  cylinder:  right  rear,  left  rear, right front, left front. PRESSURE BLEEDING A pressure bleeder with adapter plate for connection to the master cylinder reservoir is necessary to pressure bleed the  brake  system.  The  adapter  plate  is  designed  to  permit  a transfer of fluid to maintain fluid level during brake bleeding. Hydraulic  brake  fluid  level  should  be  approximately 12.7 mm (1/2") from top of master cylinder reservoir.  If, when pressure  bleeder  adapter  plate  is  removed,  fluid  level  is  too high  or  too  low,  add  or  remove  sufficient  fluid  to  bring  to correct level. Be  sure  there  is  enough  brake  fluid  in  the  bleeder tank   to   complete   the   bleeding   operation   and   the   tank   is charged with 69-207 kPa (10 30 psi) air pressure. Remove reservoir cover and attach pressure bleeder hose to master cylinder using proper adapter.  Open the valve in the pressure bleeder hose to pressurize the master cylinder and hydraulic system. Attach   a   bleeder   tube   (hose)   to   right   rear   wheel cylinder bleeder valve (screw), Fig.  2. Submerge the free end of   the   hose   in   a   glass   jar   partially   filled   with   brake   fluid. Loosen bleeder valve approximately three-quarter's turn. When  fluid  coming  from  the  submerged  end  of  the hose  is  free  of  air  bubbles,  close  bleeder  valve  and  remove drain hose.  Repeat this procedure at each wheel cylinder. When   bleeding   operation   is   completed,   close   the valve in the pressure bleeder hose.  Enclose connection with shop towel and disconnect pressure bleeder and adapter from master cylinder. Check  hydraulic  fluid  level  to  see  that  reservoir  is filled to within 12.7 mm (1/2") from top edge. Install master cylinder reservoir cover. MANUAL BLEEDING Fill   the   master   cylinder   fluid   reservoir   with   clean brake fluid.  Attach a bleeder tube hose to the right rear wheel cylinder bleeder valve (screw).  Submerge the free end of the hose   in   brake   fluid   in   a   partially   filled   glass   jar,   Fig.   2. CTS-2055S  Chapter III Page 4 PRINTED IN UNITED STATES OF AMERICA

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