Reverse Brake Assembly: Assembly

Install the reverse brake piston.
NOTE: Apply CVTF to the sealing area of reverse brake piston.

Fig 1: Installing Reverse Brake Piston
Courtesy of SUBARU OF AMERICA, INC.
Install the return spring.

Fig 2: Removing/Installing Return Spring
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Install the spring retainer.

Fig 3: Removing/Installing Snap Ring And Spring Retainer
Courtesy of SUBARU OF AMERICA, INC.
Compress the return spring using the ST to install the snap ring.
ST 18762AA000 COMPRESSOR SPECIAL TOOL

Fig 4: Removing/Installing Snap Ring And Spring Retainer
Courtesy of SUBARU OF AMERICA, INC.
Check the operation of reverse brake piston by blowing compressed air intermittently from reverse brake housing hole.

Fig 5: Locating Reverse Brake Housing Hole
Courtesy of SUBARU OF AMERICA, INC.
Place the driven plate, drive plate and retaining plate neatly in this order on surface table.
Set the dial gauge to retaining plate, and read its scale.
NOTE: The value, which is read in the gauge at this time, is zero point.
Scale and record the weight "Z" of a flat board which will be put on retaining plate.
NOTE:
- Use a stiff board which does not bend against load as a flat board to be put on retaining plate.
- Use a flat board weighing less than 29 N (3.0 kgf, 6.5 lb).
Put the flat board on retaining plate.

Fig 6: Measuring Flat Board Weight On Retaining Plate Using Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.
Using the following formula, read the push/pull gauge and calculate "N".
N = 29 N (3.0 kgf, 6.5 lb) - Z

29 N (3.0 kgf, 6.5 lb) : Load applied to clutch plate

Z: Flat board weight
Press the center of retaining plate by applying a force of "N" using push/pull gauge, and then measure and record the compression amount "A".
NOTE: Measure at four points with a 90° interval and calculate the average.

Fig 7: Measuring Compression Amount "A" Using Push/Pull Gauge
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Install the dish plate, drive plate, driven plate, retaining plate and snap ring to the reverse brake housing.
NOTE: Install the dish plate in the correct direction.

Fig 8: Identifying Dish Plate Installation Position
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Measure and record the clearance "B" between the retaining plate and snap ring.

Fig 9: Measuring Clearance "B" Between Retaining Plate And Snap Ring
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Piston stroke calculation

Calculate with A and B dimensions recorded before. If it exceeds the limit, replace with a new drive plate and adjust within the initial standard value.

S mm (in) = A + B

S: Piston stroke

A: Compression amount of drive plate and dish plate

B: Clearance between retaining plate and snap ring

Initial standard:

2.3 - 2.7 mm (0.091 - 0.106 in)

Limit thickness:

2.9 mm (0.114 in)

Retaining plate
Part No.	Thickness mm (in)
31567AB750	4.2 (0.165)
31567AB800	4.4 (0.173)
31567AB810	4.6 (0.181)
31567AB820	4.8 (0.189)