Is ur car suddenly do that after applying brakes? if yes.
drive ur car again at 50, 60km and apply brakes many times (in a test area), by doing this 2-3 times, stop the car, and check ur rims one by one by applying ur hands on each rims, If any of the rim gets over heated as compared to other rims, the problem will be with that rim's brake pads,disc or brake adjustment etc.
This is an expert suggestion, if in doubt ask ur mechanic this whole story.........