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TC Series Hydraulic Brake ABS System

030.1-3

Safety

The purpose of this safety summary is to ensure the

safety and health of personnel and the protection of

equipment.

All users of this publication shall read, understand,

and apply this safety summary when performing

maintenance and operating procedures.

WARNINGS and Cautions

All users of this publication shall read, and

understand, all WARNINGS and Cautions.

WARNINGS REFER TO A PROCEDURE

OR PRACTICE THAT, IF NOT ADHERED

TO, COULD RESULT IN INJURY OR

DEATH.

Cautions refer to a procedure or practice,

that, if not adhered to, could result in damage

to or destruction of equipment.

Introduction

This supplement contains information for the

Meritor Version D hydraulic ABS.

Meritor Wabco™ hydraulic anti-lock braking

system (ABS) is an electronic wheel speed

monitoring and control system. Meritor Wabco™

hydraulic anti-lock braking system (ABS) is used on

buses and is chassis equipped with a hydraulic brake

system.

Description of Operation

Wheel sensors detect wheel speed. The sensors

generate signals that are transmitted to an Electronic

Control Unit (ECU). If the wheels start lockup, the

ECU sends a signal to the modulator assembly to

regulate the brake pressure of each the affected

wheel.

During an ABS stop, a solenoid valve in the

modulator assembly is rapidly pulsed; that is, it

opens and closes several times per second to control

the brake pressure. When this occurs, drivers may

notice a pulsation on the brake pedal.

An ABS indicator lamp on the vehicle dash alerts

the driver to a possible system fault and provides

blink code information to diagnose the system.

If the ABS indicator lamp comes on during normal

vehicle operation, drivers may complete the trip, but

are instructed to have the vehicle serviced as soon as

possible.

In the unlikely event of an ABS system malfunction,

the ABS of the affected wheel will be disabled and

will return to normal braking. The other sensed

wheels will retain their ABS function.