The brakes are brand new, but found out what's wrong, took it to a RR mechanic shop ironically named Rover Automotive, and they found the brake lines that run under the driver's side under that trim; are rusted bad and that's where the leak is coming from, just gotta wait a week til they get them. We know why there was noise, as the pads, rotors and rear calipers were all replaced so all good there.