No.1 Brake

NO.1 BRAKE





Components

No.1 Brake Disassembly
1. REMOVE PLANETARY SUN GEAR AND NO.1 ONE-WAY CLUTCH





a. Using a snap ring expander, remove the snap ring.





b. Remove the planetary sun gear with No.1 one-way clutch.





2. CHECK PISTON STROKE OF NO.1 BRAKE
Using a dial indicator, measure the No.1 brake piston stroke while applying and releasing compressed air (392 - 785 kPa, 4 - 8 kgf/cm2 , 57 - 114 psi).

Piston stroke: 0.78 - 1.50 mm (0.0307 - 0.0591 inch)

If the values are non-standard, inspect the disc.
3. REMOVE FLANGE





a. Using a screwdriver, remove the snap ring.





b. Remove the flange.





4. REMOVE DISC AND PLATE





5. REMOVE PISTON RETURN SPRING
a. Place Special Service Tools (SST) on the spring seat and compress the return springs with a shop press.
SST 09350-20015 (09369-20040)
b. Using a snap ring expander, remove the snap ring.





c. Remove the piston return spring.





6. REMOVE NO.1 BRAKE PISTON
a. Hold the No.1 brake piston with hand, apply compressed air to the center support to remove the No.1 brake piston.
b. Remove the 2 O-rings from the piston.





7. REMOVE OIL SEAL RINGS
Remove the 3 oil seal rings.

No.1 Brake Inspection





1. INSPECT DISC, PLATE AND FLANGE
Check to see if the sliding surface 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 parts of the printed numbers are defaced, replace disc.
- Before assembling new disc, soak it in Automatic Transmission Fluid (ATF) for at least 15 minutes.





2. CHECK CENTER SUPPORT BUSHING
Using a dial indicator, measure the inside diameter of the center support bushing.

Maximum inside diameter: 36.46 mm (1.4354 inch)

If the inside diameter is greater than the maximum, replace the center support.

No.1 Brake Assembly





1. INSTALL OIL SEAL RINGS
a. Coat the 3 oil seal rings with ATF.
b. Contract the oil seal rings and install them onto the center support.

NOTICE: Do not spread the ring ends too much.

HINT: After installing the oil seal rings, check that they rotate smoothly.





2. INSTALL NO.1 BRAKE PISTON
a. Coat new O-rings with ATF and install them on the No.1 brake piston.
b. Place SST on the No.1 brake piston.
SST 09350-20015 (09369-20040)
c. Being careful not to damage the O-rings, press in the No.1 brake piston into the center support with both hands.
3. INSTALL PISTON RETURN SPRING





a. Install the piston return spring.
b. Place SST on the spring seat, and compress the return springs with a shop press.
SST 09350-20015 (09369-20040)





c. Install the snap ring with a snap ring expander. Be sure the end gap of the snap ring is not aligned with the spring seat claw.





4. INSTALL PLATE AND DISC
5. INSTALL FLANGE





a. Install the flange, the rounded edge facing downward.





b. Using a screwdriver, install the snap ring. Be sure the end gap of the snap ring is not aligned with the cutout portion of the center support.





6. CHECK PISTON STROKE OF NO.1 BRAKE
Using a dial indicator, measure the No.1 brake piston stroke while applying and releasing compressed air (392 - 785 kPa, 4 - 8 kgf/cm2 , 57 - 114 psi).

Piston stroke: 0.78 - 1.50 mm (0.0307 - 0.0591 inch)

If the piston stroke is less than the limit, parts may have been assembled incorrectly, check and reassemble again.
7. INSTALL PLANETARY SUN GEAR AND NO.1 ONE-WAY CLUTCH





a. While turning the one-way clutch, install the planetary sun gear.





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