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 WRX BaseFACTORY OEM SERVICE PROCEDURE

Master Cylinder: Assembly

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

When replacing the oil reservoir COMPL, adhere the brake fluid caution label (a) to the position shown in the figure. (Except for electric brake booster model (for C0))

Preparation items:

Brake fluid caution label (part No. 25080GA010)

Courtesy of SUBARU OF AMERICA, INC.

Install the seal reservoir to the master cylinder assembly.
Install the oil reservoir COMPL.
1. Place the master cylinder assembly between aluminum plates and fix it on a vise.
  CAUTION:
  Be careful not to tighten a vise excessively.
2. Drive a new pin using a punch and a hammer to install the oil reservoir COMPL.
Courtesy of SUBARU OF AMERICA, INC.

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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.