2020 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Reverse Brake: Assembly

  1. Install the reverse brake piston.
    NOTE: Apply CVTF to the sealing area of reverse brake piston.
    G10406578Courtesy of SUBARU OF AMERICA, INC.
  2. Install the return spring.
  3. Install the spring retainer.
  4. Compress the return spring using the ST and a press to install the snap ring.

    Preparation tool: 

    ST: COMPRESSOR SPECIAL TOOL (18762AA001)

    G10218835Courtesy of SUBARU OF AMERICA, INC.
  5. Check the operation of reverse brake piston by blowing compressed air from reverse brake housing hole.
  6. Place the driven plate, drive plate and retaining plate neatly in this order on surface table.
  7. 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.
  8. 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).
  9. Put the flat board on retaining plate.
    G06654563Courtesy of SUBARU OF AMERICA, INC.
  10. 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

  11. 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.
    G13592272Courtesy of SUBARU OF AMERICA, INC.
  12. Install the dish plate, drive plate, driven plate, retaining plate and snap ring to the reverse brake housing.
    NOTE: Make sure to install in the right direction.
    G10218846Courtesy of SUBARU OF AMERICA, INC.
  13. Measure and record the clearance "B" between the retaining plate and snap ring.
    G10218847Courtesy of SUBARU OF AMERICA, INC.
  14. Calculate the piston stroke "S" with A and B dimensions recorded before.

    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

    Specification: 

    1.8 - 2.2 mm (0.071 - 0.087 in)

    Service limit: 

    2.4 mm (0.094 in)

  15. If it exceeds the limit, using a new drive plate, select the retaining plate so that the piston stroke is within the standard value.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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