STOP light on dash

Hi all im new to the forum, i just recently bought a 2004 Belingo van. The problem is that when i Stop sharp or go around a corner fast a light comes on saying STOP on the dash with another warning light and it beeps 3 times. Its not low on oil as i thought as ive checked this but im unsure of what it can be. Does anyone on here have any idea what it can be.

Thanks Dave