530i 'Warnig Lights'

Hi New Member here.. I've just bought a 1993 530i from a garage
when I start the ignition, apart from the 'ding' I get the following
P.A.S. FLUID. BRAKE LININGS. appear on the dash, after a min or so they go out, the garage say this is normal computer checks, but I'm not so sure ! is this right or am I being strung along!?
if someone can help I will go back to dealer Monday !