Front Brake

Apply ATF to D-ring, and then install it to the front brake piston.
NOTE: Use a new D-ring.
Install the front brake piston to oil pump cover.
NOTE: Install by aligning the "Δ" mark on front brake piston surface with the oil pump cover rib.

Fig 1: Installing Front Brake Piston To Oil Pump Cover
Courtesy of SUBARU OF AMERICA, INC.
Install the retainer and return spring.
Install the front brake piston assembly using
ST1, ST2 and ST3.

ST1 18762AA000 COMPRESSOR SPECIAL TOOL

ST2 18765AA000 COMPRESSOR SUPPORT

ST3 18763AA000 COMPRESSOR SHAFT

Fig 2: Installing Front Brake Piston Assembly Using ST1, ST2 And ST3
Courtesy of SUBARU OF AMERICA, INC.
Install the genuine driven plate instead of retaining plate, and temporarily assemble the drive plate and driven plate.
Part No. 31536AA290 Driven plate
Install the snap ring.

Fig 3: Installing Snap Ring
Courtesy of SUBARU OF AMERICA, INC.

Measure the clearance between the retaining plate and snap ring. If the value exceeds the specification, replace the drive plate and driven plate as a set and select the retaining plate so that the value is within the specification.

NOTE: The thickness of the genuine drive plate is 2.8±0.05 mm (0.11±0.002 in).

Front brake clearance specification:

0.7 - 1.1 mm (0.028 - 0.043 in)

Fig 4: Measuring Clearance Between Retaining Plate And Snap Ring

Courtesy of SUBARU OF AMERICA, INC.

Front brake retaining plate
Part No.	Thickness mm (in)
31567AB130	3.4 (0.134)
31567AB140	3.6 (0.142)
31567AB150	3.8 (0.150)
31567AB160	4.0 (0.157)

Remove the snap ring, replace the driven plate used in measurement of clearance with the retaining plate, and then reassemble.