Parking brake light Problem.....need sugg.

i recently installed a line lock on my 03gt......had to bleed the brakes and such.....car runs fine, and brakes feel like the always have, but now the "parking break" light comes on semi randomly and i coun't on it coming on certain times...

as I

accelerate hard

or press the brake in hard to stop quick

but it also comes on with the slightest sign of slowing down and other randome time ????

any suggestions on what my be doing this ???