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Wheel Speed
Sensor
Air Disc
Brake
Service
Brake
Chamber
Pressure
Modulator
Valve
Antilock
Traction
Relay
Valve
Pressure
Modulator
Valve
Service Brake
Chamber
Foundation Drum
Brakes
Figure 4 - Typical System Diagram (4S-4M System Shown)
roll stability program, or yaw control are operating – will also
be illuminated when there are active ABS, ATC, or ESP
DTCs. (See the Glossary on page 8 for more information
on these terms.)
See Figure 5. When ignition power is applied, each
modulator solenoid is briefly energized. If the air system
is fully charged – and the service brake pedal is depressed
during ignition – the modulator creates a single, sharp
audible "chuff" of air pressure. Bendix ECUs will perform
a PMV Chuff Test on all installed modulators in the order
shown in Figure 5. The pattern will then repeat itself.
SL-4
Stop Light Switch
™
™
TCS-9000
Pressure
Trailer
Modulator
Control
Valve
Valve
Steering
Angle Sensor
Primary
Brake
Circuit
Brake
Secondary
Valve
Brake
Circuit
For Illustration Purposes Only, Both
Air Disc Brakes And Foundation
Drum Brakes Are Shown At Either
Side Of The Axles.
TP-5
Tractor
™
Protection Valve
Antilock
Controller
Pressure Modulator Valve
Yaw Rate
Sensor
Slack Adjuster
Right Steer
1
2
Left Steer
1. Steer Axle Right PMV
2. Steer Axle Left PMV
3. Drive Axle Right PMV
4. Drive Axle Left PMV
Figure 5 - Typical Vehicle Orientation and Chuff
Sequence
Glad Hands
Air Disc
Brakes
Spring Brake
Antilock Relay Valve
Pressure Modulator Valve
Wheel Speed
Sensor
Primary
Secondary
Brake Circuit
Brake Circuit
Right Drive
7
3
Driver
4
Left Drive
5. Additional Axle Right PMV
6. Additional Axle Left PMV
7. Trailer PMV
Trailer
(Control)
C
S
Trailer
(Supply)
Wheel Speed
Sensor
Service &
Chamber
Spring
Brake
Chamber
Foundation
Drum Brakes
Right
Additional
5
6
Left
Additional
3
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