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Home >> Subaru >> 2012 >> Outback Base, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Brake System) >> Master Cylinder >> Replacement
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Master Cylinder: Replacement

WARNING: This page is about a different car, the 2011 Subaru Tribeca. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove mud and dirt from the surface of brake master cylinder.
  2. Secure the master cylinder in a vise.
    NOTE: To avoid damaging the master cylinder, place between aluminum plates or other material when holding with a vise.
  3. Remove the pin which secures the master cylinder and reservoir tank, then remove the reservoir tank and seal.
    Fig 1: Locating Pin Which Secures Master Cylinder And Reservoir Tank
    G05032790Courtesy of SUBARU OF AMERICA, INC.
  4. While pushing in the primary piston, remove the C-ring using pliers.
    Fig 2: Removing C-Ring Using Pliers
    G05032791Courtesy of SUBARU OF AMERICA, INC.
  5. While pushing in the primary piston, remove the straight pin from the port on the reservoir tank attachment location using a magnet pick-up tool.
    Fig 3: Identifying Straight Pin In Port Of Reservoir Tank
    G07926136Courtesy of SUBARU OF AMERICA, INC.
  6. Extract the primary piston assembly and secondary piston assembly straight out while taking care not to scratch the inner surface of the cylinder.
  7. Clean the inside of master cylinder with brake fluid. Check the inside of the cylinder for damage, deformation and wear. Replace the master cylinder as assembly if faulty.
  8. Apply brake fluid to the inner surface of master cylinder and piston assembly.
  9. Make sure that the inner surface of master cylinder and the piston assembly are free of foreign matter. Install the primary piston assembly and the secondary piston assembly to master cylinder, while taking care not to scratch the master cylinder inner surface.
  10. While pushing-in the primary piston, install the cylinder pin.
  11. While pushing-in the primary piston, install the C-ring to the groove using pliers.
    Fig 4: Installing C-Ring To Groove Using Pliers
    G05032791Courtesy of SUBARU OF AMERICA, INC.
    CAUTION: Make sure the C-ring is installed to the groove securely.
  12. Install the seal to reservoir tank.
    Fig 5: Identifying Reservoir Tank Seal
    G07926138Courtesy of SUBARU OF AMERICA, INC.
  13. Install the reservoir tank to the master cylinder, and secure with pin.
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