My 2007 Toyota Corolla has been having an odd issue. When the car is moving, even slowly, I hear something that sounds like rubbing, and as I go faster, there is a vibration that starts as though a tire or other spinning surface is rubbing against something at a specific point in its travel.
I first noticed it when the weather was warmer, around April. I know I needed a front brake pad replacement so I went ahead and did that. When I was removing the pads on the driver's side I noticed that the pad was not worn evenly, as in one side of the pad was more worn than the other. I wasn't in a position to do much diagnosis so I went ahead and replaced the pads. More recently I have also replaced the caliper slide pins and lubed them well to hopefully resolve the uneven wear issue.
The noise persists. Just a few days ago I started noticing a mild squeaking sound when the car is moving forward very slowly with no brake application. It pulses, which leads me to believe the rotor could be warped, however there is little to no change in vibration when I hit the pedal even at highway speeds, though there IS an increase in the loudness of the rumbling sound. I have checked for play in both front wheels and none exists, so I am ruling out wheel bearings. I am wondering if I have a combination of bad/noisy tires and a warped brake rotor, but before I start disassembling anything else or buying more parts, I wanted to ask those more knowledgeable.... what is the issue??