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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.
The figurative mark “K” and the trademarks KNORR and KNORR-BREMSE are registered in the name of Knorr-Bremse AG. Additional terms and conditions apply; please refer to our website knorr-bremseCVS.com for full Disclaimer.
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.
Copyright © Knorr-Bremse AG - all rights reserved, including industrial property rights applications. Knorr-Bremse AG retains any power of disposal, such as for copying and transferring.
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
C o m m e r c i a l V e h i c l e S y s t e m s
Function - KB4TA D:
2S/2M and 4S/2M Systems
Two ABS relay modulator valves (K019290 or K019299
depending on the ECU) are used in the systems to control
the flow of air to and from the brake actuators during an
ABS intervention. One valve is used to control the brake
actuators on each side of the trailer. The relay modulator
valves are electro-pneumatic control valves and are the
last valves that air passes through on the way to the brake
actuators.
During normal braking, the valve 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 valve to apply proportional pressure to the
trailer brake actuators.
In the case of an ABS intervention, the ECU will energise
only the exhaust solenoid to modify or hold the brake
actuator pressure.
4S/3M Systems
An additional axle modulator valve (K019290 or K019299
depending on the ECU)) is required for 4S/3M ABS
applications. This is same control valve as is used in the 2M
systems and is used to control the flow of air to the brake
actuators on both sides of one axle (typically the rearmost
axle on a semi-trailer or the front axle of a drawbar trailer).
Technical Data:
• Maximum Pressure: . . . . . . . . . . 10 bar
• Operating Temperature Range: . . -40 °C to +75 °C
Connections to ECUs K068353 and K146282:
• 6.2 (Common (GND)) to X2-9 connection for 2M
systems and X2-10 Connection for the 3rd modulator
in 3M systems.
• 6.3 (Exhaust solenoid) to X2-3 and X2-4 connections
for 2M systems and X1-1 Connection for the 3rd
modulator in 3M systems.
K019290 and K019299*
Notes:
The mixing of K019290 and K019299 valves
on one trailer is strictly prohibited!
Use of K019299 in conjunction with ECU
K068353 is strictly prohibited!
*
K019299 is specifically designed for the Brazilian market.
Note:
For information on cables, connections and
troubleshooting for the K019299 valve in other
documents use the references to K019290.
Connections to ECU K140786:
• 6.2 (Common (GND)) to X2-9 and X2-10
connections for 2M systems and X1-12 Connection
for the 3rd modulator in 3M systems
• 6.3 (Exhaust solenoid) to X2-3 and X2-4
connections for 2M systems and X1-1 Connection
for the 3rd modulator in 3M systems
Y026787: 006: EN: Released: Fri Nov 11 11:18:50 CET 2016:
