it's not a handbrake (warning) light for f**ks sake....
it's a light that tells you that you either have the handbrake on or there is a PROBLEM with your brakes (and/or ABS if that also lights up)
could be low brake fluid level, broken wire, broken swimmer, faulty handbrake switch,.... if you have ABS does that also come on? If yes get VCDS and scan for fault codes.