brakes ISUZU TFS SERIES 1997 Repair Manual

5-46 BRAKES
MASTER CYLINDER
REMOVAL AND INSTALLATION
BRAKE PEDAL ASSEMBLY
This illustration based on the LHD model.
Removal Steps
1. Brake line
2. Nut ; master cylinder to vacuum servo
3. Master cylinder assembly
Installation Steps
3. Master cylinder assembly
2. Nut ; master cylinder to vacuum servo
1. Brake line
Important Operation - Removal
1. Brake Line
Be very careful not to spill brake fluid on the painted surface.
Damage to the painted surface will result.
Important Operation - Installation
2. Nut ; Master Cylinder to Vacuum Servo
Torque N
m (kgfm/lbft)
1.0 - 1.6 (7 - 12 / 9.8 - 16)
1. Brake Line
Torque N
m (kgfm/lbft)
0.9 - 1.5 (6.5 - 11 / 8.8 - 15)

BRAKES 5-47
DISASSEMBLY
Disassembly Steps
1. Dust seal
2. Screw
3. Reservoir ; fluid, brake
4. Grommet
5. Ring ; snap
6. Bolt ; stopper7. Gasket
8. Piston assembly ; primary and spring
9. Piston assembly ; secondary and spring
10. Cover ; fluid reservoir
11. Seal
12. Cylinder assembly ; brake, master

5-48 BRAKES
Important Operations
When disassembling, inspecting or reassembling the master
cylinder assembly, take care not to bring the parts into contact
with mineral oil or dust. Wash the piston cups only with brake
fluid. Do not use gasoline or other mineral-base cleaning
solvents.
5. Ring ; Snap
Remove the snap ring from the cylinder body with pushing in
the primary and secondary pistons.
6. Bolt ; Stopper
Push in the primary and secondary pistons and remove the
stopper bolt completery from the cylinder body, then remove
the primary and secondary piston assemblies.
8. Piston Assembly ; Primary and Spring
9. Piston Assembly ; Secondary and Spring
Don’t remove the spring from the piston.

BRAKES 5-49
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear damage or any other abnormal conditions are found
through inspection.
Cylinder inside face
Piston
Piston cap
Piston cap spacer
Return port
Return spring
Visual Check
Inspect the following parts for wear, distortion, cuts, nicks,
corrosion, or other abnormal conditions.
Master Cylinder Bore Diameter
Standard mm(in)
23.81 (0.938)
Clearance between the Master Cylinder
and the Piston
Measure the outer diameter of the piston assembly at the
portions shown in the left figure.
mm(in)
Standard Limit
0.04 - 0.125
(0.00158 - 0.00493)0.15 (0.00591)
Note:
If the clearance deviates from the range shown above,
replace the master cylinder and the piston assembly
together.

5-50 BRAKES
Return Port
Check the return port for obstructions and if necessary, clean
with a tag wire.
Blow away foreign matter with compressed air.
Primary Piston
After reassembly, push in the primary piston to see that returns
smoothly.
Repeat the test two or three times to see that brake fluid is
forced out from the front and rear outlets.

BRAKES 5-51
REASSEMBLY
; Repair Kit
Reassembly Steps
1. Cylinder assembly ; brake, master
2. Piston assembly ; secondary and spring
3. Piston assembly ; primary and spring
4. Ring ; snap
5. Gasket
6. Bolt ; stopper
7. Grommet
8. Reservoir ; fluid, brake
9. Screw
10. Seal
11. Cover ; fluid reservoir
12. Dust seal
Important Operations
1. Cylinder Assembly ; Brake, Master
Lubricate the master cylinder bore with clean rubber
grease.(arrowed portion)

5-52 BRAKES
2. Piston Assembly ; Secondary and Spring
3. Piston Assembly ; Primary and Spring
Lubricate the piston cups on the primary piston assemblies with
rubber grease.
Take care not to scratch the piston cup when installing the
piston assemblies.
Note:
Don't remove the spring from the piston.
6. Bolt ; Stopper
Depress the primary piston and install the piston stopper bolt
with a new gasket.
Torque N
m(kgfm/lbft)
6.9 - 8.8 (0.7 - 0.9 / 5.1 - 6.5)
7. Grommet
Lubricate the new grommets with clean rubber grease.
Insert the grommets, with the flared side up, into the cylinder
body.
Apply rubber grease to the dust seal portion.
(The portion indicated by the arrows in the left diagram.)
9. Screw
Torque N
m(kgfm/lbft)
1.0 - 2.0 (0.01 - 0.20 / 0.7 - 1.5)
12.Dust Seal
Install the dust seal so that its groove faces downward.

BRAKES 5-53
VACUUM SERVO
REMOVAL AND INSTALLATION
Removal Steps
1. Clamp ; vacuum hose
2. Vacuum hose
3. Brake line
4. Return spring ; brake pedal
5. Snap pin
6. Pin ; push rod to brake pedal
7. Vacuum servo to dash panel and pedal
mounting bracket
8. Maser cylinder assembly
9. Vacuum servo assembly
Installation Steps
9. Vacuum servo assembly
8. Maser cylinder assembly
7. Vacuum servo to dash panel and pedal
mounting bracket
6. Pin ; push rod to brake pedal
5. Snap pin
4. Return spring ; brake pedal
3. Brake line
2. Vacuum hose
1. Clamp ; vacuum hose

5-54 BRAKES
Important Operation - Removal
3. Brake Line
When handling, be careful not to spill brake fluid over the
painted surfaces, as damage to the paint finish will result.
Important Operation - Installation
8. Master Cylinder Assembly
Check the distance from the flange face of the vacuum servo
to the end of the push rod before installation of the master
cylinder.
Projection (A) mm(in)
18.0 - 18.2 (0.709 - 0.717)
If the measured distance deviates from the specified range,
make an adjustment with the lock nut
1 at the end of the push
rod.
Torque N
m(kgfm/lbft)
15 - 25 (1.5 - 2.5 / 11 - 18)
7. Vacuum Servo to Dash Panel and Pedal Mounting
Bracket
Torque N
m(kgfm/lbft)
22 - 31 (2.2 - 3.2 / 16 - 23)
Apply sealer to the dashboard fitting face.
3. Brake Line
Torque N
m(kgfm/lbft)
9 - 15 (0.9 - 1.5 / 6.5 - 11)

BRAKES 5-55
2. Vacuum Hose
1) W hen removing or replacing the vacuum hose make sure
that the arrow on the label of the hose is facing the engine.
2) Also confirm that the check valve is facing the engine.