Second Brake Piston: Disassembly

REMOVE 2ND BRAKE PISTON RETURN SPRING SUB-ASSEMBLY
1. Place SST on the return spring and compress.
2. Using a screwdriver, pry out the snap ring.
  
  Fig 1: Installing SST
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the piston return spring.
INSPECT 2ND BRAKE PISTON RETURN SPRING SUB-ASSEMBLY (See DISASSEMBLY )

Fig 2: Inspecting 2Nd Brake Piston Return Spring Sub-Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE 2ND BRAKE PISTON
1. Hold the 2nd brake piston and apply compressed air (392 kPa, 4.0kgf/cm² , 57 psi) to the 2nd brake cylinder to remove the 2nd brake piston.
  
  Fig 3: Removing 2Nd Brake Piston
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE 2ND BRAKE PISTON O-RING
1. Remove the 2 O-rings from the 2nd brake piston.
  
  Fig 4: Removing 2Nd Brake Piston O-Ring
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002