Okay, so it's happened to me too.
After the 'harsh' winter storms and the supposedly very cold winter, I'm now hearing some rather heavenly noises coming from my front axle.
I initially thought it might be a faulty shock absorber or salt on the tire treads, but that's not the case.
Since my 4B is equipped with Xenon headlights, there are axle sensors located on the axles. It's hard to believe, but it's true: these small, dirty things make a noise like a faulty shock absorber.
So, you should probably encounter this issue as well: First, check the wheel speed sensors. A little WD40 might provide a quick, but temporary, fix. However, a new wheel speed sensor will likely need to be installed in the near future.