Subaru 2009 IMPREZA Service Manual page 1962

AUTOMATIC TRANSMISSION
15) Take out the retaining plate, drive plate and
driven plate of the 2-4 brake.
16) Take out the thrust needle bearing, planetary
gear assembly and low clutch assembly.
17) Remove the 2-4 brake seal.
18) Remove the snap ring.
(B)
(A) Snap ring
(B) 2-4 brake piston
AT Main Case
19) Take out the 2-4 brake spring retainer.
AT-00254
20) Remove the 2-4 brake piston and 2-4 brake
piston retainer while taking care not to damage
them.
AT-00255
21) Pull out the leaf spring of the low & reverse
brake while being careful not to bend it.
AT-04848
(A)
AT-00285
4AT-106
(A)
(B)
(A) 2-4 brake piston
(B) 2-4 brake piston retainer
(A)
(A) Leaf spring
AT-00286
AT-00287
AT-00293