Got a question for you why does the abs pump on my disco td5 keep running,and lost brakes and put new master cylinder on went to bleed the brakes got a pedal then started disco had a drive around lost brakes again tryed to bleed brakes again just keeps useing fluid 4.5 litres don't know where...

Why will Abs pump not switch off it keeps running with key out on 03 disco td5 and went to bleed brakes still no brakes and used 4.5 litres of fluid no leaks where is fluid going can't work it out HELP PLEASE