Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Reverse Brake: Disassembly
- Remove the snap ring.
- Remove the retaining plate, drive plate, driven plate and dish plate.
- Set the ST1, ST2 and ST3 to intermediate case.
Preparation tool:
ST1: COMPRESSOR SPECIAL TOOL (18762AA001)
ST2: COMPRESSOR SHAFT (18763AA000)
ST3: COMPRESSOR SUPPORT (18765AA000)
- Compress the return spring to remove the snap ring.
- Remove the snap ring and spring retainer.
- Remove the return spring.
- Remove the reverse brake piston by blowing compressed air from intermediate case hole.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.