I think you'll find that the right rear ring magnet is damaged, which is attached to the wheel bearing. From the mechanic who replaced mine, "GM put in a real cheesy part when they designed the Acadia". Cost $500.00 for replacement and labor, hear in Michigan. Bad part is all 4 wheels has the same part that could go bad. Forgot had the exact same symptoms clicking noise when I started out and then would away, brakes felt like they were pulsating, and sounded like I was dragging a tree limb.
Stability track and ABS
09 Acadia had the Service stability track and ABS come kn when driving on the highway. Replaced the foot pedal sensor, worked a little then it came on again. Now it's more frequent. Got it coded and it showed RR wheel speed sensor, replaced that and it still comes on. Before the fault comes on my brake pedal feels like it's on gravel and it makes a howling sound. Also sounds like there's a stick in the tire or draging something. Once the faults comes on it goes away and everything feels like normal. Any advice is appreciated. Not a car guy but I'm willing to fix things on my own.
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