Vibration during braking - thoughts?

[derpyimp]

Hey guys, I've got a quick dash cam video for you to watch. I was out driving down the canyon, pushing the car a bit but nothing too crazy. During the last two or three turns I started to notice a slight vibration when I was on the brakes, then it got really bad as I was on the last turn before the light. I couldn't replicate it again after that. Any ideas what it might be? I don't think it's the ABS acting up. It felt different than that. Almost like something coming loose but I don't know what.

Link to a video of it. The vibration is quite audible for a few seconds.
Google Photos

Thanks

 

[WarStryker13]

Check the caliper bracket bolts, I've had one back out completely and disappear, it was the top bolt, front passenger side.

 

[derpyimp]

I didn't have time today to actually jack up the car and look closely at anything, but all the caliper bracket bolts are present and appear fully tightened from a visual inspection. I drove the car as usual today and still could not replicate the problem. I wonder if it was caused by the car getting hot somehow. I guess I won't worry about it again unless I see it happen again.

 

[BillBoost37]

Likely it was as you think. Without knowing pad composition and quality of rotor, it's all possible. If you can't replicate it.. smile and keep on driving

 

[derpyimp]

Likely it was as you think. Without knowing pad composition and quality of rotor, it's all possible. If you can't replicate it.. smile and keep on driving

That's the plan I guess. I'm on what I suspect are original or OE replacement rotors, and I put PowerStop Evolution ceramic pads on the fronts shortly after I got the car (I think I still have cheap organics on the rears that the used car dealer installed). I wasn't on the brakes all that much going down the canyon though.