brake TOYOTA SIENNA 2007 Service Repair Manual

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNITAX–191
AX
56. REMOVE PLANETARY CARRIER THRUST WASHER
NO.1
(a) Remove the planetary carrier thrust washer No.1
from the planetary gear assembly.
57. REMOVE 2ND BRAKE CLUTCH DISC
(a) Using a screwdriver, remove the snap ring.
(b) Remove the flange, 4 discs and 4 plates from the
transaxle case.
58. INSPECT 2ND BRAKE CLUTCH DISC
HINT:
(See page AX-198)
59. REMOVE 2ND BRAKE PISTON ASSEMBLY
(a) Using a screwdriver, remove the snap ring.
(b) Remove the 2ND brake piston assembly from the
transaxle case.
60. REMOVE REAR PLANETARY GEAR ASSEMBLY
(a) Using a screwdriver, remove the snap ring.
D026394E02
D026395E01
D008058E01
D026396E04
D003616E01

AX–192U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
AX
(b) Remove the rear planetary gear assembly from the
transaxle case.
61. REMOVE INPUT SUN GEAR
(a) Remove the 2 thrust needle roller bearings, thrust
bearing race No.2 and the input sun gear from the
transaxle case.
62. REMOVE 1ST AND REVERSE BRAKE CLUTCH DISC
(a) Remove the flange, 6 discs and 6 plates from the
transaxle case.
63. INSPECT 1ST AND REVERSE BRAKE CLUTCH DISC
HINT:
(See page AX-198)
64. REMOVE FRONT PLANETARY GEAR ASSEMBLY
(a) Using a chisel and hammer, unstake the lock
washer.
NOTICE:
Push down all claws of the washer. Otherwise
the SST cannot be fully pressed against the nut,
and cannot loosen the nut.
(b) Using SST, remove the nut.
SST 09387-00030, 09387-00080
D026591E02
D003873E02
D026397
D003595E01
D003596E01

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNITAX–193
AX
(c) Using SST and a press, remove the front planetary
gear assembly from the counter drive gear.
SST 09950-60010 (09951-00450), 09950-70010
(09951-07100)
(d) Remove the front planetary gear assembly from the
brake hub.
65. REMOVE FRONT PLANETARY RING GEAR
(a) Using a screwdriver, remove the snap ring and front
planetary ring gear from the brake hub.
66. REMOVE 1ST AND REVERSE BRAKE RETURN
SPRING SUB-ASSEMBLY
(a) Place SST on the return spring, and compress the
return spring with a press.
SST 09387-00070
(b) Using a snap ring expander, remove the snap ring.
NOTICE:
• Stop the press when the spring seat is
lowered 1 to 2 mm (0.039 to 0.078 in.) from the
snap ring groove, to prevent the spring seat
from being deformed.
• Do not expand the snap ring excessively.
67. INSPECT 1ST AND REVERSE BRAKE RETURN
SPRING SUB-ASSEMBLY
HINT:
(See page AX-198)
D026398E01
D026763E01
D003615E02
D003600E01

AX–194U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
AX
68. REMOVE 1ST AND REVERSE BRAKE PISTON
(a) Apply compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi)
to the transaxle case to remove the 1st and reverse
brake piston.
NOTICE:
• Applying compressed air may cause the
piston to jump-out. When removing the
piston, hold it using a waste cloth.
• Take care not to splash ATF when applying
compressed air.
(b) Remove the 2 O-rings from the 1st and reverse
brake piston.
69. REMOVE COUNTER DRIVE GEAR
(a) Using SST and a press, remove the counter drive
gear from the transaxle case.
SST 09950-60010 (09951-00590), 09950-70010
(09951-07100)
(b) As shown in the illustration, tighten the 2 bolts
evenly and make clearance of approx. 20.0 mm
(0.787 in.) between the counter drive gear and the
inner race.
(c) Using SST, remove the tapered roller bearing.
SST 09950-60010 (09951-00590), 09950-00020,
09950-00030, 09950-40011 (09957-04010)
D026405E01
D026713E01
C089120E01
D003602E01
D003603E01

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNITAX–195
AX
70. REMOVE TRANSFER DRIVEN PINION FRONT
BEARING
(a) Using a snap ring expander, remove the snap ring.
(b) Using SST and a press, remove the bearing outer
race.
SST 09950-60020 (09951-00910)
71. REMOVE BREATHER PLUG NO.2 (ATM)
72. REMOVE UNDERDRIVE BRAKE RETURN SPRING
SUB-ASSEMBLY
(a) Place SST on the return spring, and compress the
return spring with a press.
SST 09387-00020
(b) Using a snap ring expander, remove the snap ring.
NOTICE:
• Stop the press when the spring seat is
lowered 1 to 2 mm (0.039 to 0.078 in.) from the
snap ring groove, to prevent the spring seat
from being deformed.
• Do not expand the snap ring excessively.
73. INSPECT UNDERDRIVE BRAKE RETURN SPRING
SUB-ASSEMBLY
HINT:
(See page AX-199)
74. REMOVE UNDERDRIVE BRAKE PISTON
(a) Apply compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi)
to the transaxle case to remove the underdrive
brake piston.
D026467E01
C089121E01
D026407E01
D026406E01

AX–196U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
AX
(b) Remove the 2 O-rings from the underdrive brake
piston.
75. REMOVE NEEDLE ROLLER BEARING
(a) Using SST, remove the needleroller bearing from
the transaxle case.
SST 09387-00041 (09387-01010, 09387-01030,
09387-01040)
76. REMOVE UNDERDRIVE CLUTCH DRUM OIL SEAL
RING
(a) Remove the 2 oil seal rings from the transaxle case.
77. REMOVE TRANSAXLE CASE NO.1 PLUG
(a) Remove the 2 transaxle case No.1 plugs.
(b) Remove the 2 O-rings from the 2 transaxle case
No.1 plugs.
78. REMOVE UNDERDRIVE CYLINDRICAL ROLLER
BEARING
(a) Using SST, remove the underdrive cylindrical roller
bearing from the transaxle case.
SST 09514-35011
D003794E01
D003605E01
D003914E01
D026383
D003606E01

AX–198U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
AX
3. INSPECT OVERDRIVE DIRECT CLUTCH DRUM SUB-
ASSEMBLY
(a) Using a dial indicator, measure the inside diameter
of the forward clutch hub bushing.
Standard inside diameter:
23.025 to 23.046 mm (0.9065 to 0.9073 in.)
Maximum inside diameter:
23.09 mm (0.9091 in.)
NOTICE:
Check the contact surface of the bushing in the
direct clutch shaft. If any scratch or
discoloration is found, replace the direct clutch
sub-assembly with a new one.
If the inside diameter is greater than the maximum,
replace the forward clutch hub with a new one.
4. INSPECT 2ND BRAKE CLUTCH DISC
(a) Check if the sliding surface of the disc, plate and
flange are worn or burnt.
If necessary, replace them.
NOTICE:
• If the lining of the disc comes off or discolors,
or if a part of the groove is worn, replace all
discs.
• Before installing new discs, immerse them in
ATF for at least 15 minutes.
5. INSPECT 1ST AND REVERSE BRAKE CLUTCH DISC
(a) Check if the sliding surface of the disc, plate and
flange are worn or burnt.
If necessary, replace them.
NOTICE:
• If the lining of the disc comes off or discolors,
or if a part of the groove is worn, replace all
discs.
• Before installing new discs, immerse them in
ATF for at least 15 minutes.
6. INSPECT 1ST AND REVERSE BRAKE RETURN
SPRING SUB-ASSEMBLY
(a) Using a vernier calipers, measure the free length of
the spring together with the spring seat.
Standard free length:
17.61 mm (0.6933 in.)
HINT:
If the result is not as specified, replace the spring.
D003829E01
D026717
D009189
D030852E07

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNITAX–199
AX
7. INSPECT UNDERDRIVE BRAKE RETURN SPRING
SUB-ASSEMBLY
(a) Using a vernier calipers, measure the free length of
the spring together with the spring seat.
Standard free length:
13.24 mm (0.5213 in.)
HINT:
If the result is not as specified, replace the spring.
8. INSPECT PACK CLEARANCE OF 1ST AND
REVERSE BRAKE
(a) Using vernier calipers, measure the distance
between the disc surface and the contact surface of
the 2nd brake cylinder and transaxle case
(Dimension A).
(b) Select an appropriate flange so that the pack
clearance will meet the specified value.
Pack clearance:
1.16 to 1.35 mm (0.0457 to 0.0531 in.)
HINT:
Piston stroke = Dimension A - Flange thickness
Flange thickness: mm (in.)
(c) Install the flange.
9. INSPECT PACK CLEARANCE OF 2ND BRAKE
(a) Using a vernier calipers, measure the distance
between the disc surface and snap ring surface
(Dimension B).
(b) Select an appropriate flange so that the pack
clearance will meet the specified value.
Pack clearance:
0.62 to 0.91 mm (0.0244 to 0.0358 in.)
HINT:
Piston stroke = Dimension B - Flange thickness -
Snap ring thickness 1.6 mm (0.063 in.)
Flange thickness: mm (in.)
D030852E01
D026452E01
Mark Thickness Mark Thickness
1 1.8 (0.071) 5 2.2 (0.087)
2 1.9 (0.075) 6 2.3 (0.091)
3 2.0 (0.079) 7 2.4 (0.094)
4 2.1 (0.083) 8 2.5 (0.098)
D026453E01
Mark Thickness Mark Thickness
1 3.0 (0.118) 5 3.4 (0.134)
2 3.1 (0.122) 6 3.5 (0.138)
3 3.2 (0.126) 7 3.6 (0.142)
4 3.3 (0.130) 8 -

AX–200U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
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10. INSPECT PACK CLEARANCE OF UNDERDRIVE
BRAKE
(a) Using a dial indicator, measure the underdrive brake
pack clearance while applying and releasing
compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi).
Pack clearance:
1.81 to 2.20 mm (0.0713 to 0.0866 in.)
HINT:
Select an appropriate flange from the table below so
that it will meet the specified value.
Flange thickness: mm (in.)
(b) Temporarily remove the snap ring and attach it to
the flange.
(c) Reinstall the snap ring.
11. INSPECT UNDERDRIVE 1-WAY CLUTCH ASSEMBLY
(a) Install the underdrive clutch assembly to the 1-way
clutch.
(b) Rotate the underdrive 1-way clutch assembly to
check the rotating direction for the lock or free
operation.
HINT:
If the result is not as specified, replace the
underdrive 1-way clutch.
12. INSPECT INPUT SHAFT END PLAY
(a) Using a dial indicator, measure the input shaft end
play.
End play:
0.262 to 1.244 mm (0.01 to 0.049 in.)
HINT:
If the result is not as specified, replace the input
shaft or thrust needle roller bearing.
D008082
Mark Thickness Mark Thickness
1 3.0 (0.118) 4 3.1 (0.122)
2 3.2 (0.126) 5 3.3 (0.130)
3 3.4 (0.134) - -
D003925E01
D008091

U151E AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCHAX–265
AX
4. INSTALL UNDERDRIVE CLUTCH DISC NO.1
(a) Coat the 4 discs with ATF.
(b) Install the 4 plates, 4 discs and flange to the
underdrive clutch drum.
NOTICE:
Make sure that the plates, discs, and flange are
installed as shown in the illustration.
5. INSTALL 1ST & REVERSE BRAKE RETURN SPRING
SHAFT SNAP RING
(a) Using a screwdriver, install the underdrive clutch
flange No.2 hole snap ring.
(b) Check that the end gap of snap ring is not aligned
with one of the cutouts.
NOTICE:
The snap ring should be fully engaged in the
groove of the drum.
6. INSPECT UNDERDRIVE PACK CLEARANCE
HINT:
(See page AX-262)
D026431E01
D003701