[Merc6]

See if it happens at 12.5 mph. If it does, ABS self test is the situation. Well, not really a situation unless it does that noise and send a brake light on the dash.

 

[Merc6]

All cars do the ABS self test. It's especially noticeable in the Cruze. The sequence of events is as follows:

ABS light comes on for a few seconds when you start the car. If it stays on you have a problem.
@20 KPH the dynamic ABS actuator test occurs. It sounds (and feels) like a brief grind as you pass 20KPH the first time after starting the car. If it fails the ABS light turns back on.

Basically as long as you see the ABS light when you start the car and it goes off and stays off your car is working as designed.

This.