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Knorr-Bremse Group
PD-203-360
Doc. No. Y250908 (EN - Rev. 001)
September 2016
The information contained herein is subject to alteration without notice and therefore may not be the latest release. Please check our website www.knorr-bremseCVS.com for the latest update or contact your local Knorr-Bremse representative.
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Note: If service work is carried out on a vehicle based on information provided herein, it is the responsibility of the workshop to ensure the vehicle is fully tested and in full
functional order before the vehicle is returned into service. Knorr-Bremse accepts no liability for problems caused as a result of appropriate tests not being carried out.
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Knorr-Bremse Systeme für Nutzfahrzeuge GmbH . Moosacher Straße 80 . 80809 Munich . Germany . Tel: +49 89 3547-0 . Fax: +49 89 3547-2767 . www.knorr-bremse.com . www.knorr-bremseCVS.com
KB4TA/KB4TA D System Components
P r o d u c t D a t a
ABS Modulator Relay Valve
Function KB4TA:
An additional axle modulator valve (BR9234) is required
for 4S/3M ABS applications. This is an electro-pneumatic
control valve and is the last valve that air passes through
on the way to the brake chambers. In case of an ABS
intervention, the ECU will energise only the exhaust
solenoid to modify or hold the brake actuator pressure.
During normal braking, the BR9234 operates as a standard
relay valve. As the brake control is applied or released by
the driver, the pneumatic control signal from the tractor
causes the BR9234 to apply proportional pressure to the
trailer brake actuators.
Connections to ECU:
• X1-1 Connection to exhaust solenoid of BR9234
• X1-12 Connection to Common (GND)
X1-1
Front view showing pin connection
X1-12
BR9234
Y026787: 006: EN: Released: Fri Nov 11 11:18:50 CET 2016:
