Service manual

TC Series Hydraulic Brake ABS System

030.1-2

Table of Contents

Table of Contents..........................................2

Safety..............................................................3

Warnings and Cautions................................3

Introduction...................................................3

Description of Operation..............................3

Electronic Control Unit (ECU)

Identification .................................................4

System Components......................................5

Component Removal and Installation ........7

Wheel Speed Sensor Replacement – Front

Axle.................................................................7

Modulator Assembly Installation................8

Hydraulic ABS System Brake Bleeding

Procedure.......................................................9

Manual Bleeding ...........................................10

Troubleshooting and Testing.......................10

Testing the System ........................................18

List of Figures

Figure 1—Version C and D ECU...................4

Figure 1.2—A Typical Meritor WABCO

Hydraulic ABS System ..............................4

Figure 1.3—Electronic Control Unit ..............5

Figure 1.4—Modulator Assembly ..................5

Figure 1.5—Sensor with Molded Socket........5

Figure 1.6—Sensor Spring Clip......................6

Figure 1.7—Tooth Wheel...............................6

Figure 1.8—Sensor Extension Cables ............6

Figure 1.9—ABS Indicator.............................6

Figure 2—Knuckle Mounted Sensor ..............7

Figure 2.1—Bundle Excess Cable..................7

Figure 2.2—Modulator Position.....................8

Figure 2.3—Rear Bleeding Location..............10

Figure 2.4—Front Bleeding Location.............10

Figure 3—Pin Numbers and Location............11

List of Tables

Table 1—Pin Numbers and Location .............12

Table 2—Identifying D Version Hydraulic ABS

Blink Codes................................................15

Table 3—D Version Hydraulic Blink

Codes..........................................................16

Table 4—Sensor Check Pins ..........................20

List of Schematics

Schematic 1—4S/4M D Version Hydraulic ABS

Wiring Diagram .........................................13