My 2 have always made that noise, I'm guessing it has something to do with the ABS charging in preparation for potential use. after a combined total of 240k miles, there has been no noted detrimental effect to this "charging" sound.
Great car.
Check for Brake pads worn out...and wheel bearings for this noise...If your Equinox is the AWD (all wheel drive model) sometimes going forward the automatic traction control will make a groaning sound under hard or slippery road conditions. Great mileage for this Chevy...Enjoy your Equinox!! Hope this helps.
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