i drive a 95 civic and i was driving the other day fine and all of a sudden my brake pedal would just sink to the floor when i go to slow down. I recently changed the brake pads but they've been fine for a month since then. I checked the brake fluid and its the same level it's been. I might be selling it this week so i want to get this taken care of so what should i check first. I dont think its my mc and i didnt notice any leaks near any of the front brakes or rear drums. should i just bleed them or is there a certain thing i should check in the mc?