PSA for today:
when you're doing brake work that requires unbolting the calipers & later realize you're out of Loctite, don't be a lazy cheap stupid-head and just shrug it off saying, "eh... it'll hold just fine, and besides, it's too cold to drag this job out." sure as i'm posting, you'll be excited for the first really nice day in 7 months you can take the car for a nice spirited run through the mountains, and when you do, you'll find yourself about 20 miles in and getting this terrible pulsating grinding sound.
for the caliper bracket bolts (caliper bolts, too, but i never messed with them this time)
and this was the first time i've had a problem either, but i definitely made sure to torque them all back in the best i could