We used a Bajaj pulsar 220cc year 2008 model brake disc and calliper in our gokart but then brakes are not working. Initially our brake disc was little bent, and brakes were working fine with the same setup, but then suddenly brakes stopped working so we thought there's some issue with the pressure in master cylinder so we replaced it with a new one. But eben then the problem was bugging, so we changed callipers. But even now brakes are not working.