I put just a little bit of brake fluid in my Audi A-6 Quattro 2004 . Put the cap tightly back on started and the car and the emergency brake light on the dash now beeps once but the light ( brake light ) flashes on and off . What did I do wrong ? How do I stop this and is my car brakes safe to drive as I have to drive 120 miles for work in the morning. Please help ! Thank you