Front Disc Brake Assembly: Assembly

WARNING: This page is about a different car, the 2015 Subaru Outback and 2015 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Check each part. <Ref. to INSPECTION , Front Disc Brake Assembly.>
Clean the inside of the caliper body using brake fluid.
Fluid:

FMVSS No. 116, DOT3 or DOT4
Install the piston seal and the piston - disc brake.
1. Apply a coat of brake fluid to piston seal and install the piston seal to the groove inside caliper body.
2. Apply a coat of brake fluid to the piston sliding part of caliper body and the entire outer surface of the piston - disc brake.
  Fluid:
  
  FMVSS No. 116, DOT3 or DOT4
3. Apply a coat of grease to the piston boot and fit to the groove on the ends of piston - disc brake.
  Grease:
  
  Grease contained in the pad kit or equivalent
4. Install the piston - disc brake to the caliper body.
  CAUTION: Do not force the piston - disc brake into the sliding part of caliper body.
  
  Fig 1: Installing Piston Disc Brake To Caliper Body
  Courtesy of SUBARU OF AMERICA, INC.
Apply grease contained in the piston seal kit to the lock pin - front brake, the outer surface of guide pin - front brake, the pin sliding part of the support - front disc brake, and the grooves of pin boot. (Except for STI model)
Install the pin boot to the lock pin - front brake and the guide pin - front brake, and insert them into the support - front disc brake.
CAUTION: Insert the lock pin - front brake and guide pin - front brake into specified position, and make sure that they slide and seat properly.

Fig 2: Identifying Pin Boot And Grease Applying Area
Courtesy of SUBARU OF AMERICA, INC.