PREVOST X3-45 Multiplex User Manual

1 Introduction
8
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
Off-Road ABS
On some vehicles, an off-road ABS function may be selected.
Off-road ABS improves vehicle control and helps reduce stopping
distances in off-road conditions or on poor traction surfaces such as
loose gravel, sand and dirt. This option is not available on 4S/4M
frame-mounted ECUs.
NOTE: On vehicles equipped with an off-road switch, the off-road
ABS mode is manually selected by the driver. On some vehicles, the
off-road mode may be fully automatic. Refer to the vehicle
specifications for information about the off-road ABS feature.
The ABS indicator lamp on the dash will flash while the vehicle is in
the off-road mode. This alerts the driver that the vehicle’s normal
ABS function is being modified.
Automatic Traction Control (ATC)
ATC is an option with Basic and frame-mounted E version ECUs and
is available with all Universal ECUs. ATC can be used with individual
valves, or with an integrated ABS/ATC valve package. Universal and
frame-mounted 4S/4M E version ECUs with ATC may have roll
stability control. Basic ECUs with ATC do not have RSC. Section 2
describes ATC and RSC in detail.
System Components
The ECU is the brain of the ABS system. It receives information from
the sensors and sends signals to the ABS valves. ECUs are available
for cab- or frame-mounted applications. Basic and universal ECUs
are cab-mounted. Universal and frame-mounted 4S/4M E version
ECUs with ATC may have roll stability control. Basic ECUs with ATC
do not have RSC. Figure 1.7.
Figure 1.7
A tooth wheel is mounted at, or cast in, the hub of each sensed
wheel, with a sensor installed so that its end is against the tooth
wheel. A sensor clip holds the sensor in place at the tooth wheel.
Figure 1.8.
Figure 1.8
NOTE: The sensor and clip must be greased with Meritor
WABCO-recommended lubricant whenever wheel-end maintenance
is performed. Refer to Section 4 for lubrication specifications.
An ABS modulator valve controls air pressure to each affected
brake during an ABS event. The modulator valve is usually located
on a frame rail or cross member near the brake chamber. The
modulator valve is available in bayonet-style, Figure 1.9, or
open-style connector.
Figure 1.9
The ABS valve package is an alternative to individual valves.
Figure 1.7
UNIVERSAL
ECU
FRAME-MOUNTED
ECU
BASIC
ECU
4003974a
Figure 1.8
Figure 1.9
1002009b
SENSOR
CLIP
SENSOR
TOOTH
WHEEL
BAYONET-STYLE
CONNECTOR
Also available with
open-style connector.
AIR IN
(PORT 1)
AIR OUT
(PORT 2)
4003992a
PRODUCT
IDENTIFICATION TAG

PREVOST X3-45 Multiplex Specifications

General

Length	45 ft
Width	102 in
Engine	Volvo D13
Horsepower	500 hp
GVWR	54, 000 lbs
Height	146 in
Sleeping Capacity	Varies based on floor plan
Water Capacity	Varies based on floor plan