2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

Reverse Brake Assembly: Assembly

  1. Install the reverse brake piston to the intermediate case.
    CAUTION:
    • Before installing the reverse brake piston, apply sufficient amount of CVTF to the seal surface in order to avoid damage and deformation.
    • Use SUBARU genuine CVTF.
  2. Install the return spring, and set the spring retainer and snap ring.
  3. Set the ST1, ST2 and ST3 to intermediate case.

    Preparation tool: 

    ST1: COMPRESSOR SPECIAL TOOL (18762AA001)

    ST2: COMPRESSOR SHAFT (18763AA000)

    ST3: COMPRESSOR SUPPORT (18765AA000)

    G09482118Courtesy of SUBARU OF AMERICA, INC.
  4. Compress the return spring using the ST attached, and install the snap ring.
    G10276194Courtesy of SUBARU OF AMERICA, INC.
  5. Check the operation of reverse brake piston by blowing compressed air from intermediate case hole.
    G10276197Courtesy of SUBARU OF AMERICA, INC.
  6. Place the dish plate, 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 84 N (8.6 kgf, 18.9 lb).
  9. Put the flat board on retaining plate.
    G13200173Courtesy of SUBARU OF AMERICA, INC.
  10. Using the following formula, read the push/pull gauge and calculate "N".

    N = 84 N (8.6 kgf, 18.9 lb) - Z

    84 N (8.6 kgf, 18.9 lb): Load applied to clutch plate

    Z: Flat board weight

  11. Press the center of retaining plate by applying a force of "N" or more 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.
    G13200174Courtesy of SUBARU OF AMERICA, INC.
  12. Install the dish plate, drive plate, driven plate, retaining plate and snap ring to intermediate case.
    NOTE: Install the dish plate in the correct direction.
  13. Measure and record the clearance "B" between the retaining plate and snap ring.
    G10276206Courtesy 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: 

    2.88 - 3.18 mm (0.113 - 0.125 in)

    Service limit: 

    3.38 mm (0.133 in)

  15. 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.