brakes ISUZU KB P190 2007 Workshop User Guide

4C1-56 FRONT WHEEL DRIVE
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear, damage or any other abnormal conditions are found
through inspection.
For inspection and servicing of disc caliper, and relative parts, and ABS parts, refer to Section Brakes.



• Hub
• Hub bearing, oil seal
• Knuckle spindle
• Disc
• Caliper
• ABS sensor rotor
• Cap, Hub flange, Shim, Snap ring
• Free wheeling hub parts (Option)
• Clutch, Knob, follower, inner, ring and
spring


Visual Check
Check the following parts for wear, damage or other abnormal
conditions.



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ISUZU KB P190 2007

BRAKE S 5
SECTI ON 5
BRAKE S
TA BLE OF CONTENTS
Section 5A Brake Control System ................................................................. ..................... 593
Section 5B Anti-Lock Brake System ................................................................................. 680
PAGE
BRAKES 5C-1
Sec
tion 5C Brakes .............................................................................................................. 700
PARKING BRAKE SYSTEM 5D-1
Section 5D Parking Brake System ............................................................................. ........ 770
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ISUZU KB P190 2007

5A-8 BRAKE CONTROL SYSTEM
Pressure Isolation (Pressure Maintain)
The electronic-hydraulic control unit is activated when
the brakes are applied.
If the information from the wheel speed sensors
indicates excessive wheel deceleration (imminent
lockup), the first step in the anti-lock sequence is to
isolate the brake pressure being applied by the brake
pedal.
The microprocessor in the Control Unit sends a voltage
to the coil to energize and close the outlet valve. This
prevents any additional fluid pressure applied by the
brake pedal from reaching the wheel. W ith the outlet
valves closed, unnecessary increase in the brake
pressure is prevented.

RTW 75AMF000301
Legend
(1) Master Cylinder (5) Brake
(2) Brake Pedal (6) Outlet Valve
(3) Motor and Pump (7)Inlet Valve
(4) Accumulator



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5A-22 BRAKE CONTROL SYSTEM
System Components
Electronic Hydraulic Control Unit (EHCU), four W heel
Speed Sensors, two W arning Lamps, and G sensor.

Electronic Hydraulic Control Unit (EHCU)
The EHCU consists of ABS control circuits, fault
detector, and a fail-safe. It drives the EHCU according
to the signal from each sensor, cancelling ABS to return
to normal braking when a malfunction has occurred in
the ABS.
The EHCU has a self-diagnosing function which can
indicate faulty circuits during diagnosis.
The EHCU is mounted on the engine compartment rear
left side. It consists of a motor, solenoid valves and a
fail safe relay.
Solenoid Valves: Reduces or holds the caliper fluid
pressure for each front brake or both rear brakes
according to the signal sent from the EHCU.
Buffer chamber: Temporarily holds the brake fluid that
returns from the front and rear brake so that pressure of
front brake can be reduced smoothly.
Motor: Drives the pump according to the signal from
EHCU.
Fail safe Relay: W hen failure occurs in ABS.
The power supply to solenoid Valve is cut.

ABS Warning Lamp


RTW 75ASH000101
Vehicles equipped with the Anti-lock Brake System
have an amber “ABS” warning lamp on the instrument
panel. The “ABS” warning lamp will illuminate if a
malfunction in the Anti-lock Brake System is detected
by the Electronic Hydraulic Control Unit (EHCU). In the
case of an electronic malfunction, the EHCU will turn
“ON” the “ABS” warning lamp and disable the anti-lock
braking function.

The “ABS” warning lamp will turn “ON” for
approximately three seconds after the ignition switch is
in the “ON” position.
If the “ABS” warning lamp stays “ON” after the ignition
switch is in the “ON” position, or comes “ON” and stays
“ON” while driving, the Anti-lock Brake System should
be inspected for a malfunction according to the
diagnostic procedure.

Wheel Speed Sensor (WSS)
It consists of a sensor and a rotor. The sensor is
attached to the knuckle on the front wheels and to the
rear wheels.
The rotor is press-fit in the axle shaft.

G Sensor
The G sensor detects the vehicle deceleration speed
and sends a signal to the EHCU. In 4W D operation, all
four wheels may be decelerated in almost the same
phase, since all wheels are connected mechanically.
This tendency is noticeable, particularly on roads with
low friction coefficient, and the ABS control is adversely
affected.
The G sensor judges whether the friction coefficient of
the road surface is low or high, and changes the
EHCU's operating system to ensure ABS and EBD
control.

Normal and Anti-lock Braking
Under normal driving conditions, the Anti-lock Brake
System functions the same as a standard power
assisted brake system. However, with the detection of
wheel lock-up, a slight bump or kick-back will be felt in
the brake pedal. This pedal “bump” will be followed by a
series of short pedal pulsations which occurs in rapid
succession. The brake pedal pulsation will continue
until there is no longer a need for the anti-lock function
or until the vehicle is stopped. A slight ticking or popping
noise may be heard during brake applications when the
anti-lock feature is being used.
W hen the anti-lock feature is being used, the brake
pedal may rise even as the brakes are being applied.
This is also normal. Maintaining a constant force on the
pedal will provide the shortest stopping distance.




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BRAKE CONTROL SYSTEM 5A-27
Actuator Test
There are 8 different menus available for this test.
The state of each circuit can be tested by using these
menus. Especially when DTC cannot be detected, a
faulty circuit can be diagnosed by testing each circuit b
y
means of these menus.
Even when DTC has been detected, the circuit tests
using these menus could help discriminate between a
mechanical fault and an electrical fault.
In all cases test condition; Engine stops with the ke
y
turned to the "ON" position. To be more specific, the
test is conducted with the brake pedal stepped on afte
r
stepping once and releasing.






RTW 75ASH000201

Brake Bleed
Purpose: The purpose of this command is air bleeding
of brakes line.
Using the Tech 2 at following operation.

Air Bleeding procedure: 1. Connect the Tech 2 with the vehicle, and select "Actuator Test" menus.
2. Select a "Brake Bleed" menu from the "Actuato
r
Test" menus.





RTW 75ASH000301

3. According to indication of Tech 2 press the
"Confirm".






RTW 75ASH000401

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BRAKES 5C-1
SECTION 5C
BRAKES
TABLE OF CONTENTS
PAGE
General Description ........................................................................................................ 5C- 2
Main Data and Specifications ......................................................................................... 5C- 9
Torque Specifications ..................................................................................................... 5C-1 0
Servicing ...................................................................................................................... .... 5C-19
Front Disc Brake Assembly ............................................................................................ 5C-33 Removal and Installation............................................................................................ 5C-33
Removal and installation of Disc Pad ....................................................................... 5C-37
Disassembly ................................................................................................................ 5C- 39
Inspection and Repair ................................................................................................ 5C-40
Reassembly ................................................................................................................. 5C- 42
Rear Drum Brake Assembly ........................................................................................... 5C-45 Disassembly ................................................................................................................ 5C- 45
Inspection and Repair ................................................................................................ 5C-46
Reassembly ................................................................................................................. 5C- 48
Brake Control.................................................................................................................. . 5C-52
Removal and Installation............................................................................................ 5C-52
Master Cylinder................................................................................................................ 5C-53
Removal and Installation............................................................................................ 5C-53
Disassembly ................................................................................................................ 5C- 54
Inspection and Repair ................................................................................................ 5C-56
Reassembly ................................................................................................................. 5C- 57
Vacuum Booster .............................................................................................................. 5C -60
Removal and Installation............................................................................................ 5C-60
Disassembly ................................................................................................................ 5C- 63
Reassembly ................................................................................................................. 5C- 64
Special Tools ................................................................................................................. . 5C-70

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5C-2 BRAKES
GENERAL DESCRIPTION
FRONT DISC BRAKE


REAR DRUM BRAKE



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BRAKES 5C-3
REAR WHEEL CYLINDER



LOAD SENSING PROPORTIONING VALVE (LSPV)
RTW 35CMF000101

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5C-4 BRAKES
BLEND PROPORTIONING VALVE


RTW 45CMF000301

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BRAKES 5C-5
PIPING DIAGRAM (MODEL WITH BLEND PROPORTIONING VALVE)



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