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JR
BRAKES - ABS
DESCRIPTION
DESCRIPTION - ANTILOCK BRAKES
DESCRIPTION - ABS PLUS
DESCRIPTION - ELECTRONIC VARIABLE
BRAKE PROPORTIONING . . . . . . . . . . . . . . . 49
DESCRIPTION - TRACTION CONTROL
OPERATION
OPERATION - ANTILOCK BRAKES
OPERATION - ABS PLUS
OPERATION - ELECTRONIC VARIABLE
BRAKE PROPORTIONING . . . . . . . . . . . . . . . 51
OPERATION - TRACTION CONTROL
CAUTION
CAUTIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . 52
DIAGNOSIS AND TESTING - INSPECTION
AND ROAD TEST
STANDARD PROCEDURE - ANTILOCK BRAKE
SYSTEM BLEEDING
SPECIFICATIONS
ABS FASTENER TORQUE . . . . . . . . . . . . . . . 54
TONE WHEEL RUNOUT
WHEEL SPEED SENSOR AIR GAP
FRONT WHEEL SPEED SENSOR
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
BRAKES - ABS
DESCRIPTION
DESCRIPTION - ANTILOCK BRAKES
This section covers the Mark 20e Antilock Brake
System. This vehicle is available with or without
traction control.
The purpose of this four-channel design antilock
brake system is to prevent wheel lockup under brak-
ing conditions on virtually any type of road surface.
Antilock braking is desirable because a vehicle that
is stopped without locking the wheels retains direc-
tional stability and some steering capability. This
allows the driver to retain greater control of the vehi-
cle during braking.
This ABS system has ABS Plus and Electronic
Variable Brake Proportioning (EVBP). (Refer to 5 -
ABS - BRAKES - DESCRIPTION)
BRAKES - ABS
TABLE OF CONTENTS
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page
INSTALLATION
REAR WHEEL SPEED SENSOR
REMOVAL
REMOVAL - JR27
REMOVAL - JR41
INSTALLATION
INSTALLATION - JR27
INSTALLATION - JR41
TONE WHEEL
INSPECTION - TONE WHEEL
TRACTION CONTROL SWITCH
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
INSTALLATION
HCU (HYDRAULIC CONTROL UNIT)
DESCRIPTION
OPERATION - HYDRAULIC CIRCUITS AND
VALVES
ICU (INTEGRATED CONTROL UNIT)
DESCRIPTION
OPERATION
REMOVAL - ICU
DISASSEMBLY - ICU
ASSEMBLY - ICU
INSTALLATION - ICU
For information on traction control, (Refer to 5 -
BRAKES
-
DESCRIPTION).
DESCRIPTION - ABS PLUS
There is an ABS Plus function built into the ABS
CAB. ABS Plus is a brake-on stability enhancement.
It is designed to help maintain the directional stabil-
ity of the vehicle during braking. There are no addi-
tional external components required for this function.
DESCRIPTION - ELECTRONIC VARIABLE
BRAKE PROPORTIONING
Vehicles equipped with ABS use electronic variable
brake proportioning (EVBP) to balance front-to-rear
braking. The EVBP is used in place of a rear propor-
tioning valve. The EVBP system uses the ABS sys-
tem to control the slip of the rear wheels in partial
braking range. The braking force of the rear wheels
is controlled electronically by using the inlet and out-
let valves located in the integrated control unit
(ICU).
BRAKES - ABS
. . . . . . . . . . . . . . . . . . . . . . . . . 55
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ABS
-
TRACTION
5 - 49
page
CONTROL
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