1
Introduction
3
WABCO
Maintenance Manual MM-0112 (Revised 07-18)
Figure 1.7
NOTE:
In previous versions of ABS, the valves are cycled
diagonally. Diagonal cycling does not occur with E version ABS.
Active Braking Valves (ABV)
Active Braking Valves, sometimes referred to as ABVs or 3/2 valve,
are solenoid valves used for active braking during ATC, RSC or ESC
events. Depending on system configurations, ABVs can be located
in the front axle braking system, rear axle braking system and/or the
trailer service brake system. Figure 1.8.
Figure 1.8
Brake Pressure Sensor (BPS)
The Brake Pressure Sensor or BPS is part of the RSC, ESC and HSA
system. It provides the system with the driver’s brake demand. The
sensor can be located in the primary or secondary delivery circuit
depending on the application. Figure 1.9.
Figure 1.9
Steering Angle Sensor (SAS)
The Steering Angle Sensor (SAS) is part of the ESC system. The SAS
delivers the driver’s steering input (steering wheel position) to the
ECU using a dedicated ESC system internal data link. The ECU
supplies the sensor with voltage and ground. The SAS must be
calibrated using diagnostic tools whenever it is replaced, or when
any vehicle steering components are replaced or adjusted. Refer to
Section 8. Figure 1.10.
Figure 1.7
3
1
2
4
4
1
3
6
2
5
100200
6
d
4M CHANNEL
CAB
CURBSIDE
CAB
CURBSIDE
6M CHANNEL
Figure 1.8
Figure 1.9
4007846
a
SOLENOID VALVE
(ACTIVE BRAKING VALVE)
CABLE
4006870
a
27 FT-LB
(36.6 Nm)
TORQUE
