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mike, when you hear the audible sound of air being released in sequence with the sounds coming out of the valve it is confirming the your service valve is alive and well. keep in mind these systems are very dependent on having the correct voltage and good ground to start. another place to look...

One other item, if you are having trouble hearing or verifing your modulator (service valve)valve is working, with the key in the off position apply the service brakes and then turn the key to the on position, when the ecu cycles the modulator valve will exhaust air pressure that is audible...

Here is som easy tips to start with, first do a visual inspection of wiring and sensors, if all look ok proceed to the abs ecu, unplug each sensor and using your ohm meter check the resistance of each sensor,acceptable range is 800 to 1200 ohms, if each sensor is in range continue checking each...