A disc brake is a type of brake that uses calipers to squeeze pairs of pads against a disc in order to create friction that slows the rotation of a shaft, such as a bike wheel or to hold it stationary. The energy of the motion is converted into waste heat which need a fast disperse. Below you can check a few great tests in regards of it.
Wrapping handlebars is not a easy task, most of the process requires a lot of practice and patience. Planning the wrapping in advance would help by considering a total replacement of the cables and housing. It will be also a good opportunity to adjust the levers up or down as desired. The final job should be a nice clean look for the user. Below you could find a very useful video about the entire process.