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.

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HOMESERVICE MANUALSSUBARU2007OUTBACK LIMITED, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESMECHANICAL - HYDRAULICBRAKE SYSTEMMASTER CYLINDERREPLACEMENT

2007 Subaru Outback Limited, 4D Sedan, Standard

Master Cylinder: Replacement

2007 Subaru Outback Limited, 4D Sedan, StandardSECTION Replacement

Remove mud and dirt from the surface of brake master cylinder.
Secure the master cylinder on a vise.
NOTE: To avoid damaging master cylinder, use aluminum plate while holding with vise.
Remove the pin which secures the reservoir tank to master cylinder, and then remove the reservoir tank and seal.

Fig 1: Removing Pin Securing Reservoir Tank To Master Cylinder
Courtesy of SUBARU OF AMERICA, INC.
With pushing-in the primary piston, remove the C-ring using pliers.

Fig 2: Removing C-Ring
Courtesy of SUBARU OF AMERICA, INC.
With pushing-in the primary piston, remove the straight pin from the port on installation part of reservoir tank using magnet pick-up tool.

Fig 3: Removing Straight Pin From Reservoir Tank Installation Part Port
Courtesy of SUBARU OF AMERICA, INC.
Extract the primary piston assembly and secondary piston assembly straight out, while taking care not to scratch the inner surface of cylinder.
Clean the inside of master cylinder with brake fluid. Check the inside of cylinder for damage, deform and wear. Replace the master cylinder as assembly if faulty.
Apply brake fluid to the inner surface of master cylinder and piston assembly.
Ensure that the inner surface of master cylinder and piston assembly are free of dirt before assembling. Install the primary piston assembly and secondary piston assembly, while taking care not to scratch the master cylinder inner surface.
With pushing-in the primary piston, install the cylinder pin.
With pushing-in the primary piston, install the C-ring to groove, using pliers.

Fig 4: Installing C-Ring Into Groove
Courtesy of SUBARU OF AMERICA, INC.

RENDER: 1.0x

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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.