CONFIDENTIAL
Bendix Commercial Vehicle Systems LLC
Elyria, OH 44036
PRODUCT SPECIFICATION - BW-283-PR
SPEC. BW-283-PR
73 SHEETS
SHEET NO. 10
• Side Control:
TABS side control will utilize a single ABS modulator-valve to control
one or more wheels on a given vehicle side. In the case of an unbalanced braking
surface, TABS side control will individually control each side just under the lock limit.
Side control is available in 2S/2M, 4S/2M and 4S/3M (3
rd
modulator in axle control)
installations.
• Normal Braking:
During normal braking, the TABS will function as a standard relay
valve. As brakes are applied or released by the driver, the control signal from the
tractor foot valve causes the Modulator Relay Valve to apply proportional pressure to
the trailer brake chambers.
• ABS Fail-safe:
The TABS is designed to react in a fail-safe manner in event of a
system fault. If an ABS system fault occurs, the TABS ECU will illuminate the trailer
ABS warning lamp and revert to standard pneumatic brake function.
2.3 ABS Vehicle Installation Schematic
Figure 1 illustrates an example of a component configuration of the 4S/2M ABS
installation on a 2-axle trailer. Two (2) wheel speed sensors (2S) and two (2) modulator
relay valves (2M) are used in this component configuration.
ABS
Dual Axle Trailer
TABS
1
2
3
45 6
7
11
10
8
12
14
13
9
15
1. Glad Hand - Service
2. Glad Hand - Supply
3. 7-Pin Connector – SAE J560
4. 5-Pin Connector - ABS
5. Trailer Chassis Harness
6. ABS Pigtail Harness
7. Trailer ABS Warning Lamp
8. Spring Brake Valve
9. Service Reservoirs
10. Modulator Relay Valve
11. Trailer ABS Module
12. Wheel Speed Extensions
13. Spring Brake Chambers
14. Wheel Speed Sensors
15. Exciter Rings
Figure 1: General Schematic of a Trailer ABS in 4S/2M Configuration
DOCUMENTO CONTROLADO DE FORMATO ELECTRÓNICO: Antes de utilizarlo se requiere verificar el nivel de revision o la suficiencia.
CONTROLLED ELECTRONIC MEDIA DOCUMENT: Verification of revision level or adequacy is required prior to use.
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