1988 JAGUAR XJ6 Unknown

FRESH LOCAL TRADE, SILVER IN COLOR, VERY SOLID BODY, NO RUST AT ALL!! SOME CLEAR COAT PEEL ON THE LIDS, LEATHER INTERIOR VERY NICE, GOOD TIRES, RUNS EXCELLENT! WE DROVE THIS ONE FOR ABOUT 20 MILES, DIGITAL INFO. SCREEN SHOWS BRAKE PROBLEM. IN 20 MILES, THE BRAKES FELT GREAT, EXCEPT FOR 1 TIME!! THE PEDAL WENT RIGHT TO THE FLOOR, AND SCARED THE HELL OUT OF ME!! I SHUT IT OFF, AND RESTARTED IT, AND THEN THE PEDAL WAS FINE. BUT, BASED ON THIS PROBLEM, WE ARE REQUIRING THAT THE VEHICLE BE TOWED FROM OUR STORE. IT CAN NOT BE DRIVEN UNTIL YOU GET THIS PROBLEM REPAIRED. MY GUY SUGGESTED THAT IT MAY BE SOME TYPE OF VACUUM PROBLEM. I'VE NEVER HAD A BRAKE PEDAL COME AND GO LIKE THAT! IN MY EXPERIENCE, IF YOU HAVE A NO BRAKE PEDAL, IT WILL STAY THAT WAY UNTIL YOU FIX THE PROBLEM. THIS CAR SEEMS TO HAVE AN INTERMITTENT PROBLEM.