This one has me puzzled.
Tonight I had to bleed the brakes and check out my front parking lamps (they were dead)
I went ahead and used this guy on the brakes. I don't think I did a great job, because I was getting lots of air. I made sure that the reservoir never went down below halfway.
Went for a short test drive and came back, parked in garage.
I turned off the truck, then turned it back to the ON position
I got out of the truck and noticed an electric hum from the front end. It's a pretty low sound, probably not much louder than the fan in my computer.
If I press the brakes, a louder humming comes from the rear, and the front continues humming.
If I let off the brakes, the front keeps humming.
If I turn the truck off, the humming immediately goes away.
During my test drive, I made sure the ABS worked
I have an ABS kill switch (makes the truck think the diff lock is on), and toggling that doesn't effect it
All lights are off.
I don't have VSC
What gives? It sounds like it's somewhere underneath the engine, but too hard to pinpoint.