1997 ISUZU TFS SERIES Workshop Manual

BRAKES 5-17
Secondary master
cylinder fluid
pressure
(4) When the front brake system fails.
W hen there is a failure in the front brake system, the fluid
pressure from the front master cylinder decreases.
As a result, the balance between the front and rear brake
side fluid pressures are lost at the control valve sleeve so
that the control valve sleeve moves upwards.
The control valve sleeve strikes against the piston, thereby
pushing the piston upwards.
Accordingly, the fluid pressure of the rear mater cylinder is
not decreased and is applied directly to the rear wheel
cylinder to secure a sufficient braking performance of the
rear brakes. (See the left figure.)
Valve Maintenance
In the case of fluid lead or other a abnormalities, faulty valve
should be replaced.
Note:
The load sensing proportioning valve is not repairable and
must be replaced as a completed assembly.
ADJUSTMENT PROCEDURE OF LSPV
This adjustment should be performed with the battery voltage
applied to the valve.
1. Adjust the rear axle weight by loading the rear body as
necessary.
Rear axle weight kg (lbs)
TFR 750(1.654)
TFS 900(1.985)
Note:
The rear axle weight should be adjusted to the specified
value with a man seated in the driver seat.

5-18 BRAKES
2. Connect the wiring with miniature lamp (1) and a battery (2)
between valve bracket (3) and linkage (4) with each end of
wiring clipped.
This wiring is necessary to find the moment at which piston
within the valve assembly is brought into connect with the
linkage.
Note:
As the linkage is coated with insulation material, turn the
clip (5) with 2 or 3 turns to break insulation.
3. Loosen the nut (6) and raise the valve assembly (7) all the
way.
Then lower the valve assembly gradually and tighten the nut
(6) when miniature lamp (1) turns on.
Torque N
m(kgfm/lbft)
17(1.7/12)
Note:
If the miniature lamp (1) goes out as the nut (6) is
tightened, lower the valve assembly (7) slightly with the
nut loosened, then retighten the nut(6).
4. Depress the linkage (4) near the valve assembly slightly
downward with finger (test pressue:0.5-0.8kg) and check to
see if the miniature lamp (1) goes out.
Lamp goes out : OK Adjustment is completed.
Lamp remains on : NG Repeat adjustment operation
outline under paragraph 3.
Excessive force is exerted on
linkage by piston (8) within the
valve assembly.
Note:
Adjustment can also be made by means of nuts (9) and
(10) on shackle at rear axle case side.
However, shackle nut is not normally used for adjustment
as it is for making fine adjustment.

BRAKES 5-19
5. Inspection of brake fluid pressure (Reference value)
1) Adjust the rear axle weight as specified under the
paragraph 1.
2) Install the pressure gauge on bleeder screws on the
front and rear brakes.
3) Depress the brake pedal and take reading of the
pressure gauges.
The brake fluid pressure is normal if the pressure of fluid
within the rear wheel cylinders is within the range of 34.4
5.5 kg/cm2 when pressure of fluid within the front wheel
cylinders reaches 50 kg/cm2.
Note:
The brake pedal should be depressed gradually until
specified pressure is reached without pumping or
adjusting foot pressure.

5-20 BRAKES
BLEND PROPORTIONING VALVE (IF SO EQUIPPED)
Structure and Operation
Structure
Side
I shows P-valve ; side II shows bypass valve.
Bypass valve seals the routes
4 and 5 using the seal 2 at
the piston
1 end.
In addition, spring
3 presses against the piston 1, and in
order to seal out the route
4 and route 5 sufficiently, spring
3 presses seal 2 against cylinder end surface.
The left figure is a characteristic curve diagram.

BRAKES 5-21
Operation
The operation of the P-valve by the master cylinder
pressure is unchanged up to the brake points
A and B.
If master cylinder fluid pressure penetrates into the second
break point
B, the fluid pressure pressing against the seal
2, (which isolated route 4 and route 5), passing the route
4 of the master cylinder side, overcomes the operating
force of the spring
3 + fluid pressure affecting the seal 2 of
the wheel cylinder, and presses the piston
1 to the right
side, resulting in the opening of the routes
4 and 5, and
canceling of the P-valve operation.
Then, because the master cylinder fluid pressure and the
wheel cylinder fluid pressure, up to the point
C, operate on
the identical surface of the seal
2, both have identical
ascending ratio.
However, because of the operation of spring
3 in the wheel
cylinder side, wheel cylinder fluid pressure operate to
preserve the balance against the master cylinder fluid
pressure on the lower level with the difference in pressure
resulting from this spring.
Valve Maintenance
In the case of fluid leak or other abnormalities, faulty valve
should be replaced.
The valve is set up at the right hand side of the 5th
crossmember near the rear axle.
Note:
The blend proportioning valve is not repairable and must
be replaced as a complete assembly.
BLEEDING OF THE BRAKE HYDRAULIC
CIRCUIT
If air enters the bake lines, it will cause poor brake action.
Therefore, bleeding should be performed if the brakes have
been used with the level of brake fluid in the reservoir
excessively low or if brake pipes have been disconnected in
the course of brake servicing.
Bleeding operation calls for co-operative action of 2 persons.
Set the parking brake firmly while bleeding.
Perform bleeding operation with ENGINE RUNNING, to
prevent damage to push rod seal.
Make sure exhaust is suitably ventilated.
Bleed the hydraulic system with the fluid reservoir filled to
the specified level.
Bleed the system starting with the rear wheel cylinder
farthest from the master cylinder.
A : Load sensing proportioning valve (If so equipped).

5-22 BRAKES
1. Fill the brake fluid reservoir with brake fluid.
Handle the brake with reasonable care to avoid spillage as it
is damaging to paint.
Note:
Take care to prevent foreign matter from entry, when
replenishing or replacing brake fluid.
When pouring brake fluid, if diaphragm in the oil tank cap
is stretched, be sure to place it into original position,
(fasten it), and then cap it.
2. Connect a vinyl pipe to the bleeder screw on the wheel
cylinder, caliper bode or LSPV and the other end of the pipe
in a transparent container.
3. Pump the brake pedal several times and hold it depressed.
Loosen the bleed screw to release brake fluid together with
air bubbles.
Tighten the bleeder screw before pressure is released
completely.
4. Repeat the step in paragraph 3 above until the air bubbles
disappear completely.
Securely tighten the bleeder screw when the air bubbles
disappear completely.
5. Repeat the step in paragraph 4 above on the remaining
wheel cylinders.
Bleed the system starting with rear side farthest from the
brake fluid reservoir.
6. Fill the brake fluid reservoir to the specified level.
Pour brake fluid carefully so as not to produce air bubbles.
7. If the cap diaphragm is stretched, fasten the diaphragm and
the sure to cap it after it is placed to the original position.
Note:
Never reuse the old brake fluid.

BRAKES 5-23
BRAKE LINE (HOSES AND PIPES)
Inspect all hoses and pipes for wear, bending, chafing,
cracks, dents, or any other damage.
Make necessary correction or parts replacement if these
abnormal conditions are found through inspection.
All hoses, pipes and joints can be damaged easily.
Do not allow the hose to become excessively twisted and
bent when working with then, and pay special attention to all
the brake lines not to damage them when repairing or
replacing other parts (axle, suspension, etc).
Inspection for leakage should be performed by depressing
the brake pedal fully.
If leakage is apparent at the circumference of joints,
retighten or replace these parts.
This procedure must be performed whenever brake lines
are installed.
After disconnecting the hoses and pipes, cap or tape the
openings to prevent entry of foreign material.

5-24 BRAKES
ADJUSTMENT PROCEDURE OF SERVICE AND PARKING BRAKE
Stem type
All brakes are self-adjusting.
Brake are adjusted by repeated stepping on the brake pedal.
The parking brake adjustment should be performed as follows:
1. Release the parking brake lever fully.
2. Loosen the lock nut (A).
3. Repeat stepping the brake pedal firmly and releasing it until
the rear brake auto-adjuster completes the function.
4. Rotate the adjust nut (B) until all slack disappears from the
cable.
5. Set the lock nut.
The parking brake lever travel is normal when the lever comes
out 9 to 11 notches when pulled with a force of 30 kg (66 lbs.).