BENDIX TABS-6 TRAILER ABS MODULE, Сервисные данные

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6
BENDIx
®
BR9235
™
ABS
MODULATOR RELAy VALVES
Bendix
®
BR9235
™
modulator relay valves (MRV) are
required when additional modulator relay valves are
needed for multichannel brake systems (e.g. 2S/2M, 4S/3M
ABS configurations).
The MRV is an electro-pneumatic control valve and is the
last valve that air passes through on the way to the brake
chambers. The normally-open hold solenoid and normally-
closed exhaust solenoid are activated to precisely modify
the brake pressure on command. During normal braking,
the Bendix BR9235 MRV functions as a standard relay
valve. As brakes are applied or released by the driver, the
control signal from the tractor foot valve causes the Bendix
BR9235 MRV to apply proportional pressure to the trailer
brake chambers.
The Bendix BR9235 MRV is available in both tank and
bracket mounting styles.
See Figure 8.
3-Pin Modulator
Solenoid
Connector
3/8" NPT Control
Port with Integral
Filter
Four 3/8" NPT Delivery Ports
(to Brake Chambers)
FIGURE 8 - BEndIx
®
BR9235
™
mOdULATOR RELAy vALvE
CRACK PRESSURE
Bendix
®
TABS-6
™
Standard modules with a component
index of S009 have no spring and are rated at a crack
pressure of 3 ± 0.5 psi.
Bendix TABS-6 Standard modules with a component index
of S010 and higher have a spring and are rated at a crack
pressure of 4.5 ± 0.5 psi.
Modulator Relay Valve (MRV) Crack Pressure
The Bendix TABS-6 ABS modulator relay valves are
available with nominal crack pressure of 4.5 ± 0.5 psi.
Previous models of Bendix TABS-6 modulator relay
valves came with a nominal crack pressure of 3.0 ± 0.5
psi. Installation drawings are available that can provide
information on which version you have.
Sensor
Sensor Mounting
Block
Secure
To Axle
Secure To
Service Hose
Speed Sensor
Lead Wire
Secure
To Axle
Service Hose
To TABS-6
Stress Loop
Use open-ended
cable clips when
securing sensor
harnesses to
service hoses.
FIGURE 7 - SEnSOR LEAd ROUTInG And SECURInG
4. Apply a moderate amount of dielectric non-conductive
grease to both the sensor connector and harness
connector.
5. Engage the connectors, and push together until the
lock tab snaps into place.
NOTE: It is important for the wheel bearings to be
adjusted per the manufacturer's recommendations.
The friction fit allows the Bendix
® WS-24 ™ sensor to slide
back and forth under force but to retain its position when
the force is removed. When the Bendix WS-24 sensor is
inserted all the way into the mounting block and the wheel
is installed on the axle, the hub exciter contacts the sensor,
which pushes the sensor back. Also, normal bearing
play will “bump” the sensor away from the exciter. The
combination of these two actions will establish a running
clearance or air gap between the sensor and exciter.
Excessive wheel end play can result in diagnostic trouble
codes in cases where the sensor is pushed too far away
from the tone ring.
Use open-ended cable clips when securing sensor
harnesses to service hoses.