In which case find some clear road and give it a good stomp - you may well find that they stop pretty well, but just require a bit more pedal force compared to most modern cars as they have less servo assistance (and therefore actually more pedal feel)
The subaru branded 4 pots are great brakes, we run them on most of our classic subaru rally cars - and some of those are making ~340bhp at the crank on a VF30 with a restrictor
If yours are like that, they almost definitely need a bleed / fluid change and pads
In which case find some clear road and give it a good stomp - you may well find that they stop pretty well, but just require a bit more pedal force compared to most modern cars as they have less servo assistance (and therefore actually more pedal feel)