2007 ISUZU KB P190 parking brake

BRAKE CONTROL SYSTEM 5A-31
2. Select a "Rear Hold Valve Test" menu from the
"Actuator Test" menus.
3. Step on the brake pedal.
4. Release the brake pedal.
5. Make sure that the rear hold solenoid valve "ON" aimed at by Tech 2 and the wheel locked position
are the same.
If different, check brake pipe, valve line harness wiring
and hydraulic unit. Repair is needed if abnormality is
found.

Rear Release Valve Test
Purpose: The purpose of this test is to detect brake pipe
and valve line harness wire for incorrect connections and
valve problem.
This test will help you confirm the result of your repai
r
service including the removal/ reinstallation of brake
pipe, valve line harness and valve.
Test conditions: The ignition key is in the "ON" position
with the four wheels lifted up. The brake pedal is stepped
on, released and stepped on again with the parking
brake released.

Test Procedure: 1. Connect Tech 2 with the vehicle, and select "Actuator Test" menus.
2. Select a "Rear Release Valve Test" menu from the "Actuator Test" menus.
3. Step on the brake pedal.
4. Make sure that the rear release solenoid valve "ON" aimed at by Tech 2 and the wheel released position
are the same.
If different, check brake pipe, valve line harness wiring
and hydraulic unit. Repair is needed if abnormality is
found.


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ISUZU KB P190 2007

BRAKES 5C-25
Filling Master Cylinder Reservoir
CAUTION:
Use only specified brake fluid. Do not use any fluid which
contains a petroleum base. Do not use a container which
has been used for petroleum based fluids or a containe
r
which is wet with water. Petroleum based fluid will cause
swelling and distortion of rubber parts in the hydraulic
brake system. Water mixed with brake fluid lowers the
fluid boiling point. Keep all fluid containers capped to
prevent contamination.
Always fill the master cylinder reservoir when the engine
is cold.
Never allow the brake fluid to come in contact with the
painted surfaces.
The master cylinder reservoir must be kept properly filled
to ensure adequate reserve and to prevent air and
moisture from entering the hydraulic system. However,
because of expansion due to heat absorbed from the
brakes and the engine, the reservoir must not be
overfilled. Thoroughly clean reservoir cap before removal
to avoid getting dirt into reservoir. Add fluid as required to
bring level to the “MAX” mark on the reservoir tank. Use
“DOT 3” Hydraulic Brake Fluid.

Leakage of Brake Fluid
W ith engine idling, set shift lever in the neutral position and
continue to depress brake pedal at a constant pedal
application force.
Should the pedal stroke become deeper gradually, leakage
from the hydraulic pressure system is possible.
Make sure by visual check that there is no leak.




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 reservoi
r
excessively low or if brake pipes have been disconnected in
the course of brake servicing.
The 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 cylinde
r
farthest from the master cylinder.


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ISUZU KB P190 2007

5C-26 BRAKES

A bleeding operation is necessary to remove air from the
hydraulic brake system whenever air is introduced into the
hydraulic system. It may be necessary to bleed the hydraulic
system at all four brakes if air has been introduced through a
low fluid level or by disconnecting brake pipes at the maste
r
cylinder. If a brake pipe is disconnected at one wheel, only that
wheel cylinder/caliper needs to be bled. If the pipes are
disconnected at any fitting located between the master cylinde
r
and brakes, then the brake system served by the disconnected
pipe must be bled.

1. Set the parking brake completely, then start the engine.
NOTE:
The vacuum booster will be damaged if the bleeding operation
is performed with the engine off.
2. Remove the master cylinder reservoir cap.


RTW 75CSH001701
3. Fill the master cylinder reservoir with brake fluid. Keep the
reservoir at least half full during the air bleeding operation.
4. Always use new brake fluid for replenishment.
5. In replenishing brake fluid, take care that air bubbles do not enter the brake fluid.

W hen the master cylinder is replaced or overhauled, first
bleed the air from the master cylinder, then from each
wheel cylinder and caliper following the procedures
described below.



RTW 75CSH001801
Bleeding the Master Cylinder
6. Disconnect the rear wheel brake pipe (1) from the master
cylinder.
Check the fluid level and replenish as necessary. I
f
replenished, leave the system for at least one minute.
7. Depress the brake pedal slowly once and hold it depressed.
8. Completely seal the delivery port of the master cylinder with your finger, where the pipe was disconnected, then release
the brake pedal slowly.
9. Release your finger from the delivery port when the brake pedal returns completely.
10. Repeat steps 7 through 9 until the brake fluid comes out o
f
the delivery port during step 7.
NOTE: Do not allow the fluid level in the reservoir to go belo
w
the half-way mark.
11. Reconnect the brake pipe (1) to the master cylinder and tighten the pipe.
12. Depress the brake pedal slowly once and hold it depressed.
13. Loosen the rear wheel brake pipe (1) at the master cylinder.
14. Retighten the brake pipe, then release the brake pedal slowly.

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ISUZU KB P190 2007

BRAKES 5C-29
ADJUSTMENT PROCEDURE OF SERVICE AND PARKING BRAKE


Stick type
All brakes are self-adjusting.
Brakes are adjusted by repeated stepping on the brake pedal.
(After stepping on the pedal and releasing it, the rear brake
auto-adjuster, produces a clicking sound.
The same operation should be repeated until the sound
disappears.)
Take the following steps after overhauling the rear brake
assembly.
1. Move the parking brake lever to its fully released position.

311R300007





























































2. Parking cable must be loosened sufficiently.
(Loosen the adjust nut and the lock nut.)
3. Repeat stepping on the brake pedal firmly and releasing it until the clicking sound can no longer be heard.
If the difference between the brake drum inside diameter o
f
the brake shoes is adjusted to be 0.5 mm, the number of
times for depressing the brake pedal can be reduced.
4. Remove the drum.
Measure the brake drum inside diameter and diameter o
f
the brake shoes.
Shoe Clearance mm (in)
0.25 - 0.40 (0.0098 - 0.0157)
If incorrect, check the brake auto-adjusting system.
5. Turn the adjuster nut so that the parking brake lever travels 10 notches when pulled up with a force 30 kg (66 lbs.).
6. Make sure there is no brake drag.




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ISUZU KB P190 2007

5C-30 BRAKES

Floor mount type
All brakes are self-adjusting.
Brakes are adjusted by repeated stepping on the brake pedal.
(After stepping on the pedal and releasing it, the rear auto-
adjuster, in the rear brake, produces a clicking sound.
The same operation should be repeated until the sound
disappears.)
Take the following steps after overhauling the rear brake
assembly.
1. Move the parking brake lever to its fully released position.
2. Parking cable must be loosened sufficiently.
(Loosen the adjust nut and the lock nut.)
3. Repeat stepping on the brake pedal firmly, and releasing it until the clicking sound can no longer be heard.
If the difference between the brake drum inside diameter o
f
the brake shoes is adjusted to be 0.5 mm (0.020 in), the
number of times for depressing the brake pedal can be
reduced.
4. Remove the drum.
Measure the brake drum inside diameter and diameter o
f
the brake shoes.


Shoe Clearance mm (in)
0.25 - 0.40 (0.010 - 0.016)
If incorrect, check the brake auto-adjusting system.



RUW 55CSH000301
5. Turn the adjuster nut so that the parking brake lever travels
7 notches when pulled up with a force 294N (30 kg / 66 lb).
6. Make sure there is no brake dragging.





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ISUZU KB P190 2007

BRAKES 5C-45
REAR DRUM BRAKE ASSEMBLY
DISASSEMBLY

First, disassemble the brake drum. Then disassemble the rear brake assembly.
Refer to the “REAR AXLE” section for the brake drum disassembly procedure.




RTW 75CMF001001

MAJOR COMPONENTS
Disassembly Steps

1. Spring; adjuster
2. Ring; Adjuster lever
3. Lever; adjuster
▲ 4. Spring; Shoe hold
5. Pin; Shoe hold
▲ 6. Spring; Shoe to shoe, lower
7. Adjuster assembly
8. Spring; shoe to shoe, upper
9. Shoe; leading

10. Shoe; trailing
11. Spring; lever return
12. Retainer
13. W asher; lever
14. Lever; parking
15. Bolt; wheel cylinder
16. W heel cylinder assembly
17. Cover
18. Back plate

MINOR COMPONENTS
Disassembly Steps
Wheel Cylinder Assembly

19. Piston assembly
20. Cup; piston
21. Boot; piston

22. Return spring
23. Cap; bleeder
24. Bleeder


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ISUZU KB P190 2007

5C-48 BRAKES
REASSEMBLY




RTW 75CMF000601

MINOR COMPONENTS
Reassembly Steps
Wheel cylinder Assembly

▲ 1. Piston assembly
2. Cup; piston
3. Return spring

4. Boot; piston
▲ 5. Bleeder
6. Cap; bleeder

MAJOR COMPONENTS
Reassembly Steps

7. Back plate
8. Cover
▲ 9. W heel cylinder assembly
▲ 10. Bolt; wheel cylinder
▲ 11. Shoe; leading
▲ 12. Lever; parking
▲ 13. W asher; lever
▲ 14. Retainer
15. Spring; lever return

▲
16. Shoe; trailing
▲ 17. Spring; shoe to shoe, upper
▲ 18. Adjuster assembly
19. Spring; shoe to shoe; lower
▲ 20. Lever; adjuster
▲ 21. Ring; Adjuster lever
▲ 22. Spring; shoe hold
▲ 23. Pin; shoe hold
24. Spring; adjuster



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ISUZU KB P190 2007

5C-50 BRAKES
308R300008






11. Shoe; leading
• Be sure to use new spring; shoe hold.
12. Lever; parking
13. Washer; lever
14. Retainer
Install the lever, the washer and the retainer to the leading
brake shoe.
•
Apply grease to the sliding surfaces of the lever and
brake shoe.
• Be sure to use new retainer and washer.
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16. Shoe; trailing
• Be sure to use new spring; shoe hold.
17. Spring; shoe to shoe, upper
18. Adjuster assembly 1. Apply grease to each of the parts shown in the illustration before installing the brake shoe.
• Lever; adjuster-shoe
• Adjuster-shoe



2. Clean the adjuster bolt (5) and the adjuster rods (1) (4).
Apply grease to the threaded portion of the adjuster bolt.
3. Install the adjuster rod to the adjuster bolt.
4.
Apply grease to the adjuster arm ends (2) (3). Set the
spring upper to the adjuster arm, then install them to the
brake shoe.

305R300010











5. Before setting the brake shoes, apply grease to the back
plate portions (1) contacting the brake shoe edge as
shown in the illustration.
6.
Apply grease to the wheel cylinder parts contacting the
brake shoe (2).
7. Install the brake shoe.
Note:
• Be careful not to damage the wheel cylinder dust cover.
• Do not allow the wheel cylinder piston to fly free.


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ISUZU KB P190 2007