Suzuki Wagon R Manual page 3480

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AUTOMATIC TRANSAXLE (M13 ENGINE MODEL) 7B1-187
26) Apply A/T fluid to 2nd brake piston assembly (1), and align
the projection of 2nd brake piston assembly with the groove
of transaxle case, then put together.
27) Install 2nd brake piston snap ring (1) by using special tool
and hydraulic press.
CAUTION:
Do not damage 2nd brake piston assembly, return spring
subassembly, plates and discs by pressing in 2nd brake
assembly passing through its original installing position
over 0.4 mm (0.016 in.).
Special tool
(A): 09926-96050
28) 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
clutch discs and plates with new ones.
2nd brake piston stroke
Standard: 0.40 – 1.25 mm (0.016 – 0.049 in.)
29) After applying A/T fluid to front sun gear thrust bearing race
(2), install it to front planetary sun gear (1).