Page 745 of 2771

BR-14
< SERVICE INFORMATION >
BRAKE MASTER CYLINDER
DISASSEMBLY
CAUTION:
While working, cover primary piston rod with cloth to prevent it from being damaged.
1. Secure flange of cylinder body in vise as shown.
CAUTION:
• Use copper plate or cloth to cover flange when securing
in vise.
• When securing master cylinder assembly in a vise, be
sure not to over-tighten.
2. Using a pin-punch [commercial service tool: diameter approx. 4
mm (0.16 in)], remove pin from reservoir tank.
3. Remove master cylinder assembly from vise.
4. Remove reservoir tank and grommet from cylinder body.
1. Reservoir cap 2. Oil filter 3. Reservoir tank
4. Grommet 5. Piston stopper 6. Cylinder body
7. Pin 8. Brake fluid level switch connector 9. O-ring
10. Secondary piston assembly 11. Primary piston assembly 12. Plate
13. Guide assembly 14. Snap ring
:PBC (Poly Butyl Cuprysil) grease
or silicone-based grease:Brake fluid
Refer to GI section GI-8, "
Component" for symbol marks unless shown.
SFIA3094E
WFIA0514E
WFIA0515E
Page 746 of 2771

BRAKE MASTER CYLINDER
BR-15
< SERVICE INFORMATION >
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5. While pushing primary piston, remove piston stopper through
secondary tank boss hole in the cylinder body.
6. Remove snap ring with pushing primary piston.
CAUTION:
Be careful not to pop out piston.
7. Holding rod of primary piston, remove primary piston assembly,
plate and guide assembly by pulling straight to prevent piston
cup from being caught by the inner wall of cylinder.
8. Remove plate and guide assembly from primary piston.
CAUTION:
Be careful not to damage rod from the inner wall of plate.
9. Tap flange using a soft block such as wood, and carefully pull
secondary piston assembly straight out to prevent cylinder inner
wall from being damaged.
INSPECTION AFTER DISASSEMBLY
Cylinder Body
• Check the inner wall of cylinder for damage, wear, corrosion, and pin holes. Replace cylinder body if neces-
sary.
ASSEMBLY
CAUTION:
• Never use mineral oils such as kerosene or gasoline during the cleaning and assembly processes.
• Make sure that there is no foreign material such as dirt and dust on the inner wall of cylinder, piston,
and piston cup. Be careful not to damage parts with a service tool when assembling.
• Do not drop parts. If a part is dropped, do not use it.
1. Apply brake fluid to the inner wall of cylinder body, primary pis-
ton assembly and secondary piston assembly.
2. Insert secondary piston and primary piston assembly into cylin-
der body in this order.
CAUTION:
• Pay attention to the orientation of piston cup, and insert
straight to prevent cup from being caught by the inner
wall of cylinder.
• Always replace inner kit as a set.
WFIA0516E
BRA0561DWFIA0517E
WFIA0518E
SBR089C
Page 747 of 2771

BR-16
< SERVICE INFORMATION >
BRAKE MASTER CYLINDER
3. Set the slit of secondary piston towards the piston stopper
mounting hole of cylinder body while pushing in the primary pis-
ton. Then install the piston stopper through the slit of secondary
piston.
4. Insert plate and guide assembly into cylinder body.
CAUTION:
• Be careful not to damage rod of primary piston.
• Pay attention to the orientation of guide assembly.
• Do not drop O-ring.
• Be careful the guide and/or plate are not inserted at an
angle to cylinder inner wall.
5. Be careful not to damage rod of primary piston with the cloth.
Then insert snap ring to cylinder body while pushing primary pis-
ton.
CAUTION:
Make sure that snap ring is securely engaged in cylinder
body inner diameter groove.
6. Apply brake fluid to a grommet, and press it into reservoir tank to install.
7. Install reservoir tank to cylinder body.
CAUTION:
Pay attention to the orientation of reservoir tank. Make sure
reservoir tank is fully seated on master cylinder.
WFIA0516E
SFIA1469E
WFIA0517E
WFIA0519E
Page 748 of 2771
BRAKE MASTER CYLINDER
BR-17
< SERVICE INFORMATION >
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8. Secure flange of cylinder body in vise as shown.
CAUTION:
• Use copper plate or cloth to cover flange for securing in
the vise.
• When securing master cylinder assembly in a vise, be
sure not to over-tighten.
• Be sure to secure the flange part with the brake tube
installation side of cylinder body facing up (chamfered pin
insert hole of cylinder body facing up).
9. Using a pin punch [commercial service tool: diameter approx. 4
mm (0.16 in)], insert the reservoir tank pin into the pin hole.
WFIA0514E
WFIA0515E
Page 749 of 2771
BR-18
< SERVICE INFORMATION >
BRAKE BOOSTER
BRAKE BOOSTER
On Board InspectionINFOID:0000000001703791
OPERATING CHECK
With the engine stopped, change the vacuum to the atmospheric pressure by depressing brake pedal several
times at intervals of 5 seconds.
Then with brake pedal fully depressed, start engine and when the
vacuum pressure reaches the standard, make sure that the clear-
ance between brake pedal and floor panel decreases.
AIRTIGHT CHECK
• Run engine at idle for approximately 1 minute, and stop it after
applying vacuum to booster. Depress brake pedal normally to
change the vacuum to the atmospheric pressure. Make sure that
distance between brake pedal and floor panel gradually increases.
• Depress the brake pedal while engine is running, then stop engine
with brake pedal depressed. The pedal stroke should not change
after holding pedal down for 30 seconds.
Removal and InstallationINFOID:0000000001703792
COMPONENTS
WFIA0520E
WFIA0521E
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BRAKE BOOSTER
BR-19
< SERVICE INFORMATION >
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REMOVAL
CAUTION:
• Be careful not to splash brake fluid on painted areas such as body. It may cause paint damage. If
brake fluid is splashed on painted surfaces of body, wipe them with cloth immediately and then wash
it away with water.
• Be careful not to deform or bend brake tubes while removing and installing brake booster.
• Replace clevis pin if it is damaged.
• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted or inclined during
installation, dash panel may damage the threads.
1. Remove vacuum hose from brake booster.
2. Remove master cylinder assembly. Refer to BR-13, "
Removal and Installation" .
3. Remove snap pin and clevis pin on the clevis of the brake
booster, and remove input rod from brake pedal.
4. Remove brake pedal nuts on pedal bracket.
5. Remove between spacer and dash panel nut from dash panel.
6. Remove brake booster and spacer from vehicle.
7. Remove spacer from brake booster.
INSTALLATION
1. Reservoir tank 2. Master cylinder 3. Brake booster
4. Clevis 5. Spacer 6. Gasket
⇐:Up
SFIA3095E
SFIA2044E
Page 751 of 2771

BR-20
< SERVICE INFORMATION >
BRAKE BOOSTER
1. Loosen lock nut to adjust input rod length so that the length B
satisfies the specified value.
2. Install spacer to brake booster and tighten spacer nut (brake
booster side) to the specified torque.
3. After adjusting length “B”, temporarily tighten lock nut to install
brake booster assembly to dash panel. At this time, make sure
to install a gasket between brake booster and vehicle.
CAUTION:
Be sure to install the gasket between brake booster and
vehicle.
4. Connect brake pedal to clevis of input rod with the clevis pin and snap pin.
5. Install brake pedal bracket nuts and tighten them to the specified torque.
6. Adjust the height and play of brake pedal. Refer to BR-5, "
Inspection and Adjustment" .
7. Tighten lock nut of input rod to the specified torque. Refer to "COMPONENTS" .
8. Install vacuum hose into brake booster. Refer to BR-21, "
Removal and Installation" .
9. Bleed air from brake system. Refer to BR-8, "
Bleeding Brake System" . Length “B” : 154 - 161 mm (6.06 - 6.34 in)
SGIA0060E
Page 752 of 2771
VACUUM LINES
BR-21
< SERVICE INFORMATION >
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VACUUM LINES
ComponentINFOID:0000000001703793
Removal and InstallationINFOID:0000000001703794
CAUTION:
• Because vacuum hose contains a check valve, it must be installed in the correct orientation. Refer to
the stamp or label to confirm correct installation. Brake booster will not operate normally if hose is
installed in the wrong direction.
• Insert vacuum hose at least 24 mm (0.94 in).
• Never use lubricating oil during assembly.
InspectionINFOID:0000000001703795
VISUAL INSPECTION
Check for improper assembly, damage and aging.
CHECK VALVE INSPECTION
Airtightness Inspection
1. Clamp 2. Engine side indicator stamp (built-in
check valve)3. Vacuum hose
4. Clip 5. Clip position stamp 6. Vacuum tube
7. To brake booster A. To intake manifold B. To brake booster
WFIA0541E
SBR225B