Suzuki Wagon R Manual page 2531

7B1-134 AUTOMATIC TRANSAXLE (M13 ENGINE)
4
2
"a"
3
50) Before disassembling 2nd brake piston assembly (4), check
2nd brake piston stroke by measuring clearance between
2nd brake separator plate (1) and piston (2) with feeler
gauge (3).
If clearance (piston stroke) is out of specification, replace
brake discs and plates with new ones.
1
2nd brake piston stroke
"a": 0.40 – 1.25 mm (0.016 – 0.049 in.)
4
51) Using special tool and hydraulic press, remove 2nd brake
piston snap ring (1).
CAUTION:
Do not press 2nd brake piston assembly in over 0.4 mm
(0.016 in.).
Excessive compression may cause damage to piston
assembly, return spring, plates and/or discs.
Special tool
(A): 09926-96050
52) Remove 2nd brake piston assembly (1).
53) Remove 2nd brake return spring subassembly (1).