So today we was viewing a house. On the way home, driving down the drive to the house down a steep hill, the red (!) Light illuminatedand a audiable beep started on the scout. I stopped and checked the handbrake wasn't still on a bit and it was all fine. Then did it again on another steep hill. Ok on the flat and driving upwards, any ideas. I've checked the hand book and no mention what it could be from what I can find.. anyone have an idea?

Check brake fluid level.