Mitsubishi Colt Ralliart. Manual - part 227

REAR DRUM BRAKE <LS, VR>

BASIC BRAKE SYSTEM

35A-54

REASSEMBLY SERVICE POINT
>>A<< PISTON CUP/PISTON INSTALLA-
TION

1. Use alcohol or brake fluid DOT 3 or DOT 4 to 

clean the wheel cylinder and the piston.

AC000929AL

MB991008

Piston

Lip must face upwards.

CAUTION

In order to keep the piston cup from becoming 
twisted or slanted, slide the piston cup down 
special tool installer (MB991008) slowly and care-
fully, without stopping.
2. Apply brake fluid DOT 3 or DOT 4 to the piston 

cups and special tool installer (MB991008).

3. Set the piston cup on special tool with the lip of 

the cup facing up. Fit the cup onto special tool, 
and then slide it down the outside of special tool 
into the piston groove.

Main

Index

Group

TOC

GROUP 35B

ANTI-SKID 

BRAKING SYSTEM 

(ABS)

CONTENTS

GENERAL INFORMATION . . . . . . . .

35B-2

SERVICE SPECIFICATIONS. . . . . . .

35B-4

SPECIAL TOOLS. . . . . . . . . . . . . . . .

35B-5

TROUBLESHOOTING . . . . . . . . . . . .

35B-6

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING  . . . . . . . . . . . . . . . . 

35B-6

NOTES WITH REGARD TO DIAGNOSIS  . 

35B-6

ABS AND BRAKE WARNING LAMP 

 

INSPECTION  . . . . . . . . . . . . . . . . . . . . . . . 

35B-7

DIAGNOSIS FUNCTION. . . . . . . . . . . . . . . 

35B-7

INSPECTION CHART FOR 

 

DIAGNOSIS CODE. . . . . . . . . . . . . . . . . . . 

35B-7

DIAGNOSIS TROUBLE CODE 

 

PROCEDURES. . . . . . . . . . . . . . . . . . . . . . 

35B-9

INSPECTION CHART FOR TROUBLE 

 

SYMPTOMS . . . . . . . . . . . . . . . . . . . . . . . . 

35B-57

INSPECTION PROCEDURE FOR 

 

TROUBLE SYMPTOMS  . . . . . . . . . . . . . . . 

35B-58

DATA LIST REFERENCE TABLE. . . . . . . . 

35B-72

ACTUATOR TEST REFERENCE TABLE . . 

35B-73

CHECK AT ABS-ECU . . . . . . . . . . . . . . . . . 

35B-73

ON-VEHICLE SERVICE . . . . . . . . . . .

35B-76

HYDRAULIC UNIT CHECK . . . . . . . . . . . . . 

35B-76

IN THE EVENT OF A DISCHARGED 

 

BATTERY  . . . . . . . . . . . . . . . . . . . . . . . . . . 

35B-77

HYDRAULIC UNIT  . . . . . . . . . . . . . . .

35B-78

REMOVAL AND INSTALLATION  . . . . . . . . 

35B-78

ABS SENSOR. . . . . . . . . . . . . . . . . . .

35B-80

REMOVAL AND INSTALLATION  . . . . . . . . 

35B-80

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 

35B-81

Main

Index

Group

TOC

GENERAL INFORMATION

ANTI-SKID BRAKING SYSTEM (ABS)

35B-2

GENERAL INFORMATION

M1352000100636

FEATURES

The 4ABS ensures directional stability and controlla-
bility during hard braking.
For vehicles with this type of ABS, 4 sensors (4 
channels) are installed on front and rear wheels 
allowing independent left and right control.
The system has the following features:

• EBD (Electronic Brake-force Distribution system) 

control has been added to provide the ideal brak-
ing force for the rear wheels.

• Magnetic encoder for detecting wheel speed has 

been installed as a wheel speed sensor instead 
of the rotor.

• For wiring harness saving and secure data com-

munication, CAN

*

 bus has been adopted as a 

tool of communication with another ECU.

NOTE: 

*

For more information about CAN (Controller 

Area Network), refer to GROUP 54D, General Infor-
mation 

P.54D-2

.

EBD CONTROL

In ABS, electronic control is used so the rear wheel 
brake hydraulic pressure during braking is regulated 
by rear wheel control solenoid valves in accordance 
with the vehicle's rate of deceleration, and the front 
and rear wheel slippage which are calculated from 
the signals received from the various Wheel speed 
sensors. EBD control is a control system which pro-
vides a high level of control for both vehicle braking 
force and vehicle stability. The system has the follow-
ing features:

• Because the system provides the optimum rear 

wheel braking force regardless of vehicle load 
conditions and the condition of the road surface, 
the system reduces the required pedal depres-
sion force, particularly when the vehicle is heavily 
loaded or driven on road surfaces with high fric-
tional coefficients.

• Because the duty placed on the front brakes is 

reduced, the increases in pad temperature can 
be controlled during brakes application to 
improve the wear resistance characteristics of the 
pad.

• Control valves such as the proportioning valve 

are no required.

SPECIFICATIONS

Item

Specification

ABS control method

4-sensor, 4-channel

Wheel speed 
sensor

Magnetic encoder

Front

86 (N pole:43, S pole:43)

Rear

86 (N pole:43, S pole:43)

Type

Semiconductor

Main

Index

Group

TOC

GENERAL INFORMATION

ANTI-SKID BRAKING SYSTEM (ABS)

35B-3

CONSTRUCTION DIAGRAM

AC400129AB

1

2

3, 7

1

4

5

6

Name of part

Number

Outline of function

Sensor

Wheel speed sensor

1

Sends alternating current signals at frequencies which are 
proportional to the rotation speeds of each wheel to the 
ABS-ECU.

Stop lamp switch

2

Sends a signal to the ABS-ECU to indicate whether the 
brake pedal is depressed or and pump motor.

Actuator Hydraulic unit

3

Drives the solenoid valves and pump motor according to 
signals from the ABS-ECU in order to control the brake 
hydraulic pressure for each wheel.

ABS warning lamp

4

Illuminates in response to signals from the ABS-ECU 
when a problem develops in the system.

Brake warning lamp

5

Illuminates in response to signals from the ABS-ECU 
when a problem develops in the EBD system or the brake 
fluid level is low.

Diagnosis connector

6

Outputs the diagnosis codes and allows communication 
with the M.U.T.-III.

Main

Index

Group

TOC