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Section 4
System Configurations
4S/2M Trailer ABS Configuration Diagram for Lift Axle Applications
(Forward Lift Axle Installation Diagram)
For direct tank-mounted installations, see “How to
Install the ECU/Valve Assembly” in Section 6,
"Component Replacement".
Typical Application:
앫 Tandem and Tri-Axle Semi-Trailer
Figure 4.5
A Service/Control Lines
B Sensor Cables
C Service to Brake Lines (Delivery Lines)
D Air Supply/Emergency Lines
1 ECU/Valve Assembly (YE)
2 External Valve (BU)
3 Air Tanks
4 Lift Axle
5 Fixed Axle
1002089e
EXTERNAL
VALVE (BU)
AIR TANK
ECU/VALVE
ASSEMBLY (YE)
AIR TANK
A Service/Control Lines
B Sensor Cables
C Service to Brake Lines (Delivery Lines)
D Air Supply/Emergency Lines
BU2 BU1
YE2
YE1
LIFT AXLE
FIXED AXLE
LIFT AXLE
FIXED AXLE
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