1986 TOYOTA CAMRY V20 brake

VALVE BODY
Hydraulic Control System

A540E, A540H
The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, the accu-
mulators, the clutches and brakes, and the governor valve as well as the fluid passages which connect all
of these components.
Based on the hydraulic pressure created by the oil pump, the hydraulic control system governs the hy-
draulic pressure acting on the torque converter, clutches and brakes in accordance with the vehicle driving
conditions.
There are three solenoid valves on the valve body.
The No. 1 and No. 2 solenoid valves are turned on and off by signals from ECU to operate the shift valves
and change the gear shift position.
The No. 3 solenoid valve is operated by signals from the ECU to engage or disengage the lock-up clutch
of the torque converter.

A540H
There are two center differential control solenoid valves on the transfer.
The solenoid valves are adjusting the center differential control pressure.
HYDRAULIC CONTROL SYSTEM
Hydr. pressure control
OIL PUMP
CLUTCHES & BRAKESFluid passage switchingPlanetary gear unit
Torque converter
Throttle Cable
SOLENOID VALVES
ECU
AT-8- AUTOMATIC TRANSAXLEOperation

COMPONENT PARTS
General Notes
The instructions here are organized so that you work on only one component group at a time.
This will help avoid confusion from similar-looking parts of different subassemblies being on
your workbench at the same time.
The component groups are inspected and repaired from the converter housing side.
As much as possible, complete the inspection, repair and assembly before proceeding to the
next component group. If a component group can not be assembled because parts are being or-
dered, be sure to keep all parts of that group in a separate container while proceeding with disas-
sembly, inspection, repair and assembly of other component groups.
Recommended fluid for the automatic transaxle: A540E ATF DEXRON
II
A540H ATF Type T or equivalent
Recommended oil for the transfer: Transaxle oil E50, API GL5, SAE 75W-90 or equivalent
GENERAL CLEANING NOTES:
1. All disassembled parts should be washed clean, with any fluid passages and holes blown
through with compressed air.
2. When using compressed air to dry parts, always aim away from yourself to prevent acciden-
tally spraying automatic transaxle fluid or kerosene in your face.
3. The recommended automatic transaxle fluid or kerosene should be used for cleaning.
PARTS ARRANGEMENT:
1. After cleaning, the parts should be arranged in proper order to allow efficient inspection,
repairs, and reassembly.
2. When disassembling a valve body, be sure to keep each valve together with the corre-
sponding spring.
3. New brakes and clutches that are to be used for replacement must be soaked in transaxle
fluid for at least fifteen minutes before assembly.
GENERAL ASSEMBLY:
1. All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be
coated with transmission fluid prior to reassembly.
2. All gaskets and rubber O-rings should be replaced.
3. Make sure that the ends of a snap ring are not aligned with one of the cutouts and are
installed in the groove correctly.
4. If a worn bushing is to be replaced, the subassembly containing that bushing must be re-
placed.
5. Check thrust bearings and races for wear or damage. Replace if necessary.
6. Use petroleum jelly to keep parts in place.
- AUTOMATIC TRANSAXLEComponent Parts (General Notes)AT-39

r Non-reusable partAT3606
Snap Ring Cover E-Ringr O-Ring Piston Oil Seal Ring Second Coast
Brake BandInner SpringPlate Washer PinPiston Rod Outer Spring
AT7703 AT7702
Second Coast Brake
COMPONENTS
DISASSEMBLY OF SECOND COAST BRAKE
PISTON
1. REMOVE OIL SEAL RING
Remove the oil seal ring from the piston.
2. REMOVE PISTON ROD
(a) Remove the E-ring while pushing the piston with
needle-nose pliers.
AT-40- AUTOMATIC TRANSAXLEComponent Parts (Second Coast Brake)

AT7704
Piston RodInner Spring Plate Washer
AT7705
AT7704
AT7706AT3607
Printed Mark
(b) Remove the inner spring, plate washer and piston
rod.
INSPECTION OF SECOND COAST BRAKE
COMPONENT
If the lining of the brake band is exfoliated or discolored,
or even part of the printed marks is defaced, replace the
brake band.
ASSEMBLY OF SECOND COAST BRAKE
PISTON
1. SELECT PISTON ROD
If the band is OK but piston stroke not within the standard
value, select the piston rod.
Piston stroke: 2.0 - 3.5 mm (0.079 - 0.138 in.)
There are two lengths of piston rod.
Piston rod length: 95.2 mm (3.748 in.)
96.3 mm (3.791 in.)
2. INSTALL PISTON ROD
(a) Install the plate washer and inner spring to the
piston rod.
(b) Install the E-ring while pushing the piston.
- AUTOMATIC TRANSAXLEComponent Parts (Second Coast Brake)AT-41

AT7707
Less than
5 mm (0.20 in.)3. INSTALL OIL SEAL RING
(a) Apply ATF to the oil seal ring.
(b) Install the oil seal ring to the piston.
NOTICE: Do not spread the ring ends more than
necessary.
AT-42- AUTOMATIC TRANSAXLEComponent Parts (Second Coast Brake)

AT4675r Non-reusable part70 (61 in.-lb, 6.9)kg-cm (ft-lb, N-m)Neutral Start Switch
55 (48 in.-lb, 5.4)
Manual Shift Leverr Lock Plate Elbow Snap Ring
275 (20, 27)Coverr O-Ring r O-Ring r O-RingPlug 2nd Coast
Brake Pistonr O-Ring Spring r O-Ring
275 (20, 27)
Union (A540E)No. 2 Speed Sensor
(A540E)
r O-Ring
275 (20, 27)
Elbow (A540H) Throttle Cabler GasketTransaxle Case
Upper Cover (A540H) r O-Ring r Gasket
275 (20, 27)
Union (A540H) Transaxle Case
Upper CoverBreather Hose
(A540H)
100 (7, 10) 200 (14, 20)
r O-Ring Solenoid WireBreather Tube (A540H) A540E and A540H
r O-Ring
: Specified torque
REMOVAL OF COMPONENT PARTS
COMPONENTS
- AUTOMATIC TRANSAXLERemoval of Component PartsAT-13

r Non-reusable part
kg-cm (ft-lb, N-m) : Specified torque
Drain Plug50 (43 in.-lb, 4.9)
r Gasket Oil Tube BracketOil Pan r Gasket Oil TubeMagnet Oil Tube
(A540H Only) CoverStrainer r GasketManual Valve
Body
100 (7, 10)
Retainer
r O-RingManual valve C
1 Accumulator
PistonConnector
Clamp B
2 Accumulator
PistonB3 Apply Tube Detent Spring r O-Ring
Spring Spring C
2 Accumulator
Pistonr Second Brake
Apply Gasket r O-RingValve BodyParking Lock Rod Springr Oil SealRetaining
Spring Pin Manual Valve
Shaftr CollarManual Valve Lever
A540E and A540H
r Gasket r O-Ring
r O-Ring
COMPONENTS (Cont'd)
AT4676
AT-14- AUTOMATIC TRANSAXLERemoval of Component Parts

kg-cm (ft-lb, N-m)
r Non-reusable part
: Specified torque
Parking Lock Pawl 2nd Coast Brake
Band Guide Snap RingBracket 1st and Reverse
Brake Pistonr Second Brake
Drum Gasket Snap Ringr GasketO/D Brake Drumr Gasket FlangeSnap RingSpringSnap RingO/D Planetary Gear
Springr O-Ring DiscBearing Snap RingRear Planetary
Gear
O/D Case250 (18, 25) 225 (16, 22)2nd Brake
DrumRear Planetary
Ring Gear Flange Plate Bearing
BearingDrum and
Sun Gear Bearing
PinBearingThrust
Washer Oil PumpThrust
WasherSecond Coast
Brake Band r O-RingDirect ClutchNo. 1 One-way
Clutch Thrust WasherFront Planetary
Ring Gear
A540E and A540H
PlateA540E: 7 pieces
A540H: 6 pieces
DiscA540E: 7 pieces
A540H: 6 piecesBearing No. 2 One-way
ClutchThrust
WasherThrust
Washer Forward Clutch
Front Planetary
Gear
COMPONENTS (Cont'd)
AT5020
- AUTOMATIC TRANSAXLERemoval of Component PartsAT-15