My answers are based on one domestic flights last week, and also a few the two years before. There were no signs for a liquid restriction in BRC, and no one checked. No one checked in EZE either, so I could happily carry my liquids with me to FRA. This year I only had a small carrion, but last year I had a regular sized one and a bagpack and it was no problem. I was in BRC one hour before the flight for a morning flight, and while the queue was quite long they told everyone not to panic, and the flight made it almost in time, even if check-in needed to be extended a little over the 30 minutes deadline.