TM-9-2320-334-13&P LHST Operator, Field and Parts Manual M1147A1 Trailer Download
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TM 9-2330-334-13&P THEORY OF OPERATION – Continued 0003 00 0003 00-9 Change 1 ABS ECU - Continued ABS Relay Valve The external ABS relay valve is the third relay valve. The ECU valve assembly services rear brake air chambers. The external ABS relay valve services front brake air chambers.