Put new brake pads on my 2012 Altima. First time doing this on any vehicle. I did not loosen the brake reservoir cap. No problem compressing the caliper pistons. When I pumped the brakes after replacing the pads I heard a "squishing" sound from what sounded like under the hood. Noticed a small pool of brake fluid underneath in the center of the car. Took it for a test ride and everything seems good. Parked it and have not seen any new evidence of fluid. Am I correct in assuming that fluid backed up and out the reservoir cap when I pumped the brakes? I there any chance I screwed up any part of the brake system like a seal or something?