i have a 1997 xj sport 3.2 but the brake lights have stopped working but when i indicate left or right or put my hazzards on they flash really fast but if i put my foot on the brake they flash at the proper speed, its driving me mad can any body help?

 

thanks for that but tryed both rear lights and they still didn't work, but noticed that indicators are back to normal but they might go back to working fast tomorrow on the way to work