ABS Page 5B –2

Page 5B–2

1 General Information

The Antilock Braking System (ABS) as fitted to MY 2004 VY Regular Cab and Crew Cab carries over from MY 2004 VY

Series vehicles and MY 2003 VY Regular Cab vehicles, noting the following exceptions:

• The rear wheel ABS sensors along with associated wiring are new to accommodate the rigid live axle design and

are unique to MY 2004 VY Regular Cab and Crew Cab and MY 2003 VY Regular Cab Models.

• The rear wheel ABS sensors are located in a dedicated aperture of each rear brak e backing plate.

• The rear disc brake backing plates and shields are unique to MY 2004 VY Regular Cab and Crew Cab and MY

2003 VY Regular Cab Models. For further serving details refer to Section 5A Service And Park Braking System in

MY 2003 VY Regular Cab Service Information.

• MY 2004 VY Regular Cab and Crew Cab Models equipped with ABS are not equipped with Traction Control

Systems (TCS).

For further servicing details of the service and park braking system, as fitted to MY 2004 VY Regular Cab and Crew Cab

Models, refer to Section 5A Service And Park Braking System in the MY 2003 VY Regular Cab Service Information.

For further servicing details of the ABS Braking System, as fitted to MY 2004 VY Regular Cab and Crew Cab Models,

refer to Section 5B ABS & ABS-TCS in the MY 2004 VY and V2 Series Service Information.

There is only one type of Antilock Braking System (ABS) fitted to MY 2004 VY Regular Cab and Crew Cab Models

(production option JL9). On all MY 2004 VY Regular Cab and Crew Cab Models, the master cylinder has a screw-in

blanking plug installed into the lower of the two front brake outlets. Each front wheel hub also includes the wheel speed

sensor as part of the assembly. Internally toothed pulse rings are attached to each of the inner axle shaft flanges, which

provide a signal that is detected by individual ABS wheel speed sensors located in the rear axle backing plate of each

side.

At road speeds above approximately 6 km/h, the ABS is designed to control brake fluid pressure so that the wheels are

prevented from locking-up during braking, irrespective of the road conditions and tyre grip. The system starts to regulate

when one wheel is detected to be decelerating faster than the other wheels, tending to lock. The vehicle remains

steerable, even in the event of panic braking, for instance on bends or when swerving to avoid an obstacle.

The ABS, modulates braking pressure separately at each front wheel, with the rear wheels sharing a single ABS

modulated hydraulic circuit. This Antilock Braking System (ABS) is referred to as a three-channel system, as three

separate hydraulic brake circuits are used to achieve anti-lock braking function.

The Tech 2 diagnostic scan tool is programmed to assist with MY 2004 VY Regular Cab and Crew Cab Model, electrical

diagnosis and probl em so lv ing , includ ing ABS.

Tech 2, connects to the ABS or ABS/TCS serial data communication information via the Data Link Connector (DLC),

which is attached to the instrument panel lower trim, to the right of the steering column. For additional information on

DLC location and system diagnosis, refer to Section 5B, ABS & ABS-TCS in MY 2004 VY and V2 Series Service

Information.

For additional and more comprehensive information regarding Tech 2, refer to Section 0C TECH 2 in the MY 2004 VY

and V2 Series Service Information.