A week ago I changed the pads & rotors on my front tires. Everything was mostly normal. On the driver's side the calpier was very rusted, but I put it back on figuring the piston still looked ok.
I drove around town a few times with the car, going on the highway once, and had no issues. Yesterday I drove to an off-site location for work 75 miles away. It's 99% highway & interstate, and I was going ~75 mph most of the way there without issue.
On the way home, about 50 miles from work & 25 miles from home, the driver side wheel started to vibrate when I was going over 60-65 mph. The vibrating wasn't constant, it seemed like it would buzz quickly a few times a second (maybe 2-4). If I had to guess, it sounded like the vibration was b/c of something on the tire/wheel/rotor rubbing against something while spinning around. The problem wasn't consistent either. I could often go up to 70 without issue, but then it seemed like randomly the vibrations would start and I just coasted down to 60 and it went away. I didn't think to brake while it was going, so I'm not sure if that is the problem.
Does anyone have any ideas what the problem is? The caliper looked a little suspect when I made the change, but I would guess it has to do with something that's spinning since it's not a constant vibration, but periodic (if that's the right word).