Suzuki Wagon R Manual page 291

5C-8 PARKING AND REAR BRAKE
7) Remove sensor ring (1) from brake drum (2) using special tools
(if equipped with ABS).
CAUTION:
Pull out sensor ring from brake drum gradually and even-
ly. Attempt to pull it out partially may cause it to be de-
formed.
Special Tool
(A): 09913-75520
(B): 09913-65135
INSPECTION
Sensor Ring (if equipped with ABS)
D Check ring serration (teeth) for being missing, damaged or de-
formed.
D Check sensor ring for being deformed (warped).
D Check that no foreign material is attached.
If any malcondition is found, repair or replace.
Brake Drum
Inspect drum for cleanliness. Check wear of its braking surface by
measuring its inside diameter.
Inside diameter
Standard : 180 mm (7.09 in.)
Service Limit : 182 mm (7.16 in.)
Whenever brake drums are removed, they should be thoroughly
cleaned and inspected for cracks, scores, deep grooves.
Cracked, Scored, or Grooved Drum
A cracked drum is unsafe for further service and must be replaced.
Do not attempt to weld a cracked drum.
Smooth up any slight scores. Heavy or extensive scoring will cause
excessive brake lining wear and it will probably be necessary to re-
surface drum braking surface.
If brake linings are slightly worn and drum is grooved, drum should
be polished with fine emery cloth but should no be turned.
NOTE:
When drum is removed, visually inspect wheel cylinder for
brake fluid leakage. Correct leaky point, if any.