Brakes are the most important safety item on a bike. So much so, that a lot of bike-shops have build-sheets for every bike that comes into the shop and assembled. Each and every nut & bolt relating to the brake are tightened to the manufacturer's specifications with a torque-wrench and the actual torque is recorded on the build-sheet. The manager then inspects the bike & signs off on build-sheet before the bike leaves the building.
Do you have?
1. manufacturer's torque specs for all the brake parts?
2. a torque-wrench?
3. know how to use the above?
The problem is, you are so far away from having the understanding of brakes to work on your own bike, that this is a serious safety issue. Yes, it's life & DEATH and you have no idea how close to DYING you are!!! If you are skydiving or working on your own brakes, try-try-again does NOT apply!!!