Low Brake Fluid indicator on 1996 Land Rover Range Rover

The low brake fluid indicator and the brake light on my Range Rover flashes on intermittently and randomly. Checked the brake fluid and it is fine. Any clue as to what might be causing it?

Asked by for the 1996 Land Rover Range Rover
have your brakes checked. when they get low in material, they take fluid out of the master. when it gets to a certain level, the light comes on to warn you. do not add fluid, get the brakes checked.