[bikessuck]

Shimano brakes? To me this really sounds like the pads moving in the calipers. If it was a loose headset, it wouldn't go away when you turn the bars 90 degrees.

 

[bikessuck]

yeah shimano mt420 so pretty low range

I had that on the fancy XTs I had on my last bike. It made me nuts when I was in the parking lot tinkering with the bike- but I promptly forgot about it when I was on the trail. I've read about solutions involving putting some specialized kind of tape or something on the back of your pads. But, assuming it's the same issue I don't think it's really a big deal or worth faffing around with.

 

[bikessuck]

Oh, that sounds like make a different issue then. Does it shake if you drop it up and down without holding the brake?

 

[bikessuck]

Well I'm stumped. Sounds like it's time for a brand new sentinel.

My gut still says that it's the brakes. You've probably checked if the rotors and calipers are tight, but I guess you'd have to have something really loose there to notice it if you dropped the front wheel.