Second Brake Piston

SECOND BRAKE PISTON

COMPONENTS:

DISASSEMBLY

1. REMOVE 2ND BRAKE PISTON RETURN SPRING SUB-ASSEMBLY
(a) Place SST on the return spring and compress the return spring with a press.
SST 09387-00060
(b) Using a screwdriver, remove the snap ring.

2. REMOVE 2ND BRAKE PISTON
(a) Hold the 2nd brake piston and apply compressed air (392 kPa, 4.0 kgf/cm2, 57 psi) to the 2nd brake cylinder to remove the 2nd brake piston.

NOTICE: Hold the piston with a shop rag or a piece of cloth when removing the piston. Failure to do so may result in the piston jumping out from the cylinder.

3. REMOVE 2ND BRAKE PISTON O-ring
(a) Remove the 2 O-rings from the 2nd brake piston.

INSPECTION

1. INSPECT 2ND BRAKE PISTON RETURN SPRING SUB-ASSEMBLY
(a) Using vernier calipers, measure the free length of the spring together with the spring seat.
Standard free length: 16.61 mm (0.6539 in.)

REASSEMBLY

1. INSTALL 2ND BRAKE PISTON O-ring
(a) Coat 2 new O-rings with ATF, and install them in the 2nd brake piston.

NOTICE: Make sure that the O-ring is not twisted or pinched.

2. INSTALL 2ND BRAKE PISTON
(a) Coat the 2nd brake piston with ATF, and install it to the 2nd brake cylinder.

NOTICE: Be careful not to damage the O-ring.

3. INSTALL 2ND BRAKE PISTON RETURN SPRING SUB-ASSEMBLY
(a) Install the 2nd brake piston return spring.

NOTICE: Installing the spring sub-assembly, check that all of the springs are fit in the piston correctly.

(b) Place SST on the piston return spring, and compress the piston return spring with a press.
SST 09387-00060
(c) Using a screwdriver, install the snap ring.
(d) Be sure that the end gap of the snap ring is not aligned with the spring retainer claw.

NOTICE:
^ Stop the press when the spring seat is lowered to the place 1 to 2 mm (0.039 to 0.078 in.) from the snap ring groove.
^ This prevents the spring seat from being deformed.