The handbrake no longer holds the car on a hill when it's applied. The handbrake can be pulled all the way up but it's still not able to hold the car in position.
When braking the brakes make a squeaking sound, when you take your foot off the brake pedal the sound stops.
Under braking the car doesn't feel stable, it doesn't feel as confident under braking as it used to.
When pressing the brakes hard in an emergency stop situation the wheels lock up and the car skids along rather than stop quickly in a straight line.
When braking the car veers off to one side, this happens even on a straight section of road. The car seems to pull to the one side.