Propeller Shaft; Brakes; Brake Chamber Effective Area; Air System - PREVOST H3-45 VIP Owner's Manual

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6
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Reverse:
Converter:
Differential ratio
Differential ratio (optional)
Differential ratio (optional)
Differential ratio (optional)
Differential ratio (optional)

PROPELLER SHAFT

Dana Spicer SPL250 type tubular shafts, provided
with heavy-duty universal joints.

BRAKES

The features of the braking system include a dual
system where the front and rear circuits are
completely independent from each other. The brakes
are air operated disc
emergency/parking brakes are located on the drive.
To ensure a constant running clearance between
pads and disc, the brakes are equipped with a non-
wearing, automatic adjuster mechanism.

BRAKE CHAMBER EFFECTIVE AREA

2
Front axle: . . . . . 24 in
Drive axle: . . . . . 24/24 in
2
Tag axle: . . . . . 16 in

AIR SYSTEM

Compressed air is provided by a twin cylinder, 31.8
cfm Wabco, gear-driven, water-cooled and engine oil
lubricated air compressor.

ANTILOCK BRAKING SYSTEM (ABS)

The antilock braking system has one Electronic
Control Unit (ECU) controlling a 6- sensor/5-
modulator (6s/5m) system. A wheel slip sensor is
mounted at each wheel.
4.80
1.90
4.30
3.91
4.10
4.56
4.88
type brakes. The
2
(service /emergency)
PA-1638 Owner's Manual X3-45 VIP
Technical Information 9-9
The Electronic Control
maintenance free. Its operating voltage is 24 ± 6
volts DC. The thermal operating range for the ECM
is from -40 to 167°F (-40 to 75°C).
The solenoid control valves are maintenance free.
Their operating voltage is 24 (+4.8, -2.4) volts DC.
The rated current draw is 1.65 amps. The thermal
operating range of the solenoid control valves is from
-40 to 176°F (-40 to 80°C).

TROUBLESHOOTING AND TESTING

For detailed information, troubleshooting and testing
refer to Bendix booklet "Bendix Service Data EC80
ESP Controller (SD- 13- 4986)" found on the
Technical Publications USB flash drive and web site
or use menu "Diagnostics" of the DID (see
INFORMATION DISPLAY (DID) MENUS " on
page 11 in Section 5 Other Features).
AUTOMATIC TRACTION CONTROL
(ATC) – ELECTRONIC STABILITY
CONTROL (ESC)
In addition to the ABS function, vehicle is equipped
with a Traction Control System (TCS) feature. This
feature is provided by the Bendix ESP EC- 80
controller. Bendix refers to this feature as Automatic
Traction Control (ATC). Bendix ATC can improve
vehicle traction during acceleration, and lateral
stability while accelerating through curves. ATC
utilizes Engine Torque Limiting (ETL) where the ECU
communicates with the engine's controller and/or
Differential Braking (DB) where individual wheel
brake applications are used to improve vehicle
traction.
The ESP EC-80 model controller also provides an
ABS- based Electronic Stability Control (ESC)
feature. Bendix refers to it as ESC Electronic
Stability Control.
The Bendix ESC system is an ABS-based stability
system that enhances vehicle stability by both
reducing engine throttle and by applying vehicle
braking based on actual vehicle dynamics
Refer to Maintenance Manual, Section 12: Brake and
Air System for more information on this system.
CAUTION
Even with ESC- equipped vehicles, the driver
remains responsible for ensuring vehicle stability
during operation.
Module (ECM) is
"DRIVER