TM 9-2320-289-347-2.DRUM AND ROTOR REPAIR (Con’t).b .ROTOR REPAIR WARNINGDO NOT use a rotor that will not meet minimum wear specifications.Failure to follow this warning may result in brake failure and serious injuryorlldeath to personnel.NOTELight scoring of rotor surface not in excess of 0.015 in. (0.381 mm) indepth is normal and will not affect brake operation.Parallelism is the measurement of the thickness of rotor at 4 or morepoints around circumference of rotor. All measurements must bemade at the same distance in from edge of rotor, Thickness must notvary by more than 0,0005 in. (0,0127 mm) from point to point.1.Measure thickness of rotor at 4 points around circumference. If rotor measures less than1.215- in. (30.86 mm) (M1009) or’ 1.465 in. (37.21 mm) (all except M1009), discard rotor.2.If rotor thickness varies over 0.0005 in. (0.0127 mm), refinish to Table 7-2 specifications.Table 7-2. Rotor ThicknessM o d e lMminimum After RefinishingReplacement/ DiscardM10091.230 in. (31.24 mm)1,215 in. (30.86 mm)All Except Ml 0091.480 in. (37.59 mm)1.465 in. (37.21 mm)I13.Check lateral runout.(a)(b)(c)(d)Install rotor. (See TM 9-2320-289-20)Tightenwheelbearings toeliminate freeplay.Attach dial indicator (1) to someportion of suspension. Point ofplunger must contact rotor face(2) about 1 in. (25 mm) fromrotor edge.Move rotor 1 complete rotation.Lateral runout should not exceed0.004 in. (0.102 mm). If lateralrunoutexceeds0.004 in.(O. 102 mm), machine rotor.7-3
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