Second Brake

DISASSEMBLY





1. REMOVE THRUST WASHER FROM 2ND BRAKE DRUM





2. CHECK 2ND BRAKE PISTON MOVEMENT
Make sure the 2nd brake piston moves smoothly when applying and releasing low-pressure compressed air to the 2nd brake drum.
3. REMOVE PISTON RETURN SPRING





a. Place SST on the spring retainer, and compress the piston return spring with a press.
SST 09350-30020 (09350-07040)

NOTICE:
- Stop the press when the spring sheet is lowered to the place 1 - 2 mm (0.039 - 0.078 inch) from the snap ring groove, preventing the spring sheet from being deformed.
- Do not expand the snap ring excessively.

b. Using a snap ring expander, remove the snap ring.
c. Remove the spring retainer.





d. Remove the piston return spring.





4. REMOVE 2ND BRAKE PISTON
a. Hold the 2nd brake piston by hand, apply compressed air to the 2nd brake drum to remove the 2nd brake piston.
b. Remove the 2nd brake piston.

HINT: If the piston is at an angle and cannot be removed, press down on the side jutting out and again apply compressed air, or wind vinyl tape around the piston end and remove it with needle nose pliers.

c. Remove the 2 O-rings from the piston.

INSPECTION





1. INSPECT DISC, PLATE AND FLANGE
Check to see if the sliding surfaces of the disc, plate and flange are worn or burnt. If necessary, replace them.

HINT:
- If the lining of the disc is peeling off or discolored, or even if a part of the printed numbers is defaced, replace all discs.
- Before assembling new discs, soak them in ATF for at least 15 minutes.





2. CHECK 2ND BRAKE PISTON RETURN SPRING
Using vernier calipers, measure the free length of the spring together with the spring seat.
Standard free length: 16.61 mm (0.6539 inch)

REASSEMBLY





1. INSTALL 2ND BRAKE PISTON
a. Coat 2 new O-rings with ATF and install them on the 2nd brake piston.
b. Being careful not to damage the O-rings, press the 2nd brake piston into the 2nd brake drum with both hands.
2. INSTALL PISTON RETURN SPRING





a. Install the piston return spring.
b. Install the spring retainer.





c. Place SST on the spring retainer, and compress the piston return spring with a press.
SST 09350-30020 (09350-07040)

NOTICE:
- Stop the press when the spring sheet is lowered to the place 1 - 2 mm (0.039 - 0.078 inch) from the snap ring groove, preventing the spring sheet from being deformed.
- Do not expand the snap ring excessively.

d. Using a snap ring expander, install the snap ring.





3. CHECK 2ND BRAKE PISTON MOVEMENT
Make sure the 2nd brake piston moves smoothly when applying and releasing low-pressure compressed air to the 2nd brake drum.





4. INSTALL THRUST WASHER
Coat the thrust washer with petroleum jelly and install it.

HINT: Make sure that the cutout portions of thrust washer match teeth of the spring retainer.