Suzuki SY413 Service Manual page 1747

INSPECT BRAKE SHOE & LINING
Where lining is worn out beyond service limit, replace shoe.
Brake lining thickness (lining + shoe rim)
Standard : 6.1 mm (0.24 in.)
Service limit : 2.8 mm (0.11 in.)
If one of brake linings is worn to service limit, all linings must be re-
placed at the same time.
NOTE:
Never polish lining with sandpaper. If lining is polished with
sandpaper, hard particles of sandpaper will be deposited in
lining and may damage drum. When it is required to correct
lining, replace it with a new one.
INSPECT WHEEL CYLINDER
Inspect wheel cylinder disassembled parts for wear, cracks, corro-
sion or damage.
NOTE:
Clean wheel cylinder components with brake fluid.
INSPECT BRAKE STRUT
Inspect ratchet of strut for wear or damage.
INSPECT SPRINGS
Inspect for damage or weakening.
Inspect each part with arrow for rust. If found defective, replace.
BRAKES 5-53