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 TM 9-2330-394-13&P
BRAKE SYSTEM THEORY OF OPERATION - Continued
0005 00
ABS ECU
After exiting the spring brake valve, the service hose assembly is plumbed to the ABS ECU. The ABS ECU
monitors and regulates release of air to the service brake air chambers using two relay valves that are
triggered when speed sensors (one on each wheel) detect trailer wheel lock-up. The relay valves
modulate the air supply by sending pulses of air. In between air pulses, the service brakes release,
thereby preventing wheel lock-up.
ABS ECU Valve Assembly.
The ABS ECU valve assembly contains the first relay valve.
0005 00-6
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