car “eated” (brittle) while braking

night i want to buy maybe tomorrow nen honda civic 5 door bj 12/1997 75ps, during the test(with) drive I noticed that the car was braking somehow eiert (it felt as if the braking effect was not linear so the “sinus-like” effect was sometimes stronger and sometimes less, the whole was regular and relatively fast – you can also call it a jerk), the salesman meant that the brakes are new at the front and have to slow down first. now i would like to know What do you think about it? Is the statement correct or should more be done? I try to do a test drive myself tomorrow… mfg demokan