the mondeos handbrake light is flashing randomly while driving so what could this be a symptom of?

Does it do anything other than tell you the hand brakes on? On the Sierra it was a low fluid warning light and abs pressure etc so rather than just change the switch is rather have a proper fix

It comes on for a second or so, flashes a few times then out again

Or it will come of for a few seconds and then go out

All while driving on smooth roads and not after bumps or the like

If it was any other light I'd wait till I got home but obv brakes are the one thing you can't ignore

Cheers