Techs at bendix referred to item as ws2d which is a sensor mounted on wheel and generates (senses) a wheel pulse in relation to wheel speed and/or modulates air pressure accordingly. They described it as essentially a "coil around a bag with two wires to activate the brains of the brake".
NSN 6135-01-020-3805
NSN 6150-01-129-0325
NSN 2925-00-033-4621
NSN 5950-01-592-3145
NSN 6220-00-973-9416
NSN 6130-01-555-8361
NSN 6650-01-480-2687
NSN 5985-01-390-8937
NSN 6110-01-384-3075
NSN 6645-00-127-3835
NSN 6145-01-006-6984
NSN 5996-01-193-5974