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DISC BRAKES
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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INSPECTION OF PADS
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BRAKES-HYDRAULIC Excessive   variation   can   cause   pedal   vibration   or fight,   front   end   vibrations   and   possible   "grab"   during   the braking   action--a   condition   comparable   to   an   out-of-round brake drum. To make the thickness variation or parallelism check on the rotor at the same time the runout is being checked, use a micrometer to check the variation in thickness of the rotor at four equal points around the rotor (Fig.  18). Fig.    18    Checking Rotor with Micrometer If  the  thickness  varies  more  than  .0127  mm  (.0005 in.)  refacing  of  the  rotor  will  be  required;  or  replace  it  if  the rotor  will  not  true  up  before  minimum  allowable  thickness  is obtained. REMACHINING ROTORS The   rotors   can   be   remachined   to   provide   a   new, smooth braking surface (Fig.  19).  If the rotor will not true up before  minimum  allowable  thickness  (see  Specifications)  is obtained, it must be replaced. Fig.    19   Correct Method of Refacing Rotor IMPORTANT Rotors are identified by the minimum allowable  thickness  they  can  be  used.  Any rotor   thinner   than   the   minimum   dimension must not be used. Removal of too much metal would cause overheating and, more important, a thin rotor could permit the seals in the cylinder to "uncover". To uncover a seal in the cylinder would result in loss of  hydraulic  brake  fluid.    An  uncovered  seal  would  not  be apparent  at  first,  but  as  the  pads  wear,  more  travel  of  the cylinder  would  be  required;  and  since  the  rotor  would  be  too thin, the seals could leak. ROTOR REMACHINING SPECIFICATIONS Brake Group Code No Rotor Original Thickness (New) Minimum Allowable Remachining Thickness Minimum Use- able Thickness in. mm . in mm. in mm 04135 1.240 31.50 1.195 30.353 1.180 29.97 04138 1.180 29.97 1.135 28.429 1.120 28.45 04139 1.180 29.97 1.135 28.429 1.120 28.45 04140 1.180 29.97 1.135 28.429 1.120 28.45 CTS-2779  Page 8 PRINTED IN UNITED STATES OF AMERICA

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