RECONDITIONING BRAKE DRUMS AND SHOESIMPORTANTThe dimension located on the drum Is discarddimension. Never remachine drums to maximumwear or discard diameter.To recondition a brake drum in a lathe (Figure 8), thedrum must be remounted so that it is centered. Useproper size cone to provide accurate centering. Turndrum, taking only light cuts and remove just enoughmaterial to clean up drum. Then grind the finishedsurface if grinder Is available or use emery cloth on astraight piece of wood and polish the drum frictionsurface.Figure 8 - Reconditioning Drum on Brake DrumLatheBrake drums should be cleaned thoroughly with a steamcleaner or hot water. Do not use a solvent which leavesan oily residue. If inspection shows the drums may beused without remachining, rub friction surface with fineemery cloth or sandpaper to remove any foreigndeposits. If drum has been reconditioned, clean frictionsurface with fine emery cloth or sandpaper and wash.Examine very carefully to see that no metal chips remainin drum.INSPECTION OF SHOESWhen brake linings or blocks are worn to within 6.35 mm(0.25 inch) of rivets, the brake shoes must be removedand relined. It is recommended that all the brakes berelined at the same time since this will maintain balancedbraking on the vehicle. If complete replacement is notdesirable or necessary, be sure that all lining on one axle(both sides) is replaced at the same time. Examineshoes carefully and discard those which have anydefects as shown in Figure 9.Figure 9 Defects to be Looked for on Brake ShoeREPLACING LINING ON SHOESInspect brake shoe alignment by observing old liningwear pattern, Figure 10.Figure 10 - Brake Shoe Alignment with Unusual LiningWearCTS-4082B - Page 5
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