RECONDITIONING BRAKE DRUMS AND SHOES
IMPORTANT
The dimension located on the drum Is discard
dimension. Never remachine drums to maximum
wear or discard diameter.
To recondition a brake drum in a lathe (Figure 8), the
drum must be remounted so that it is centered. Use
proper size cone to provide accurate centering. Turn
drum, taking only light cuts and remove just enough
material to clean up drum. Then grind the finished
surface if grinder Is available or use emery cloth on a
straight piece of wood and polish the drum friction
surface.
Figure 8 - Reconditioning Drum on Brake Drum
Lathe
Brake drums should be cleaned thoroughly with a steam
cleaner or hot water. Do not use a solvent which leaves
an oily residue. If inspection shows the drums may be
used without remachining, rub friction surface with fine
emery cloth or sandpaper to remove any foreign
deposits. If drum has been reconditioned, clean friction
surface with fine emery cloth or sandpaper and wash.
Examine very carefully to see that no metal chips remain
in drum.
INSPECTION OF SHOES
When brake linings or blocks are worn to within 6.35 mm
(0.25 inch) of rivets, the brake shoes must be removed
and relined. It is recommended that all the brakes be
relined at the same time since this will maintain balanced
braking on the vehicle. If complete replacement is not
desirable or necessary, be sure that all lining on one axle
(both sides) is replaced at the same time. Examine
shoes carefully and discard those which have any
defects as shown in Figure 9.
Figure 9 Defects to be Looked for on Brake Shoe
REPLACING LINING ON SHOES
Inspect brake shoe alignment by observing old lining
wear pattern, Figure 10.
Figure 10 - Brake Shoe Alignment with Unusual Lining
Wear
CTS-4082B - Page 5
