It is very rarely that cable replacement is necessary therefore please check FAQ regarding issues with brake axis first to avoid unnecessary replacement of these cables
Replacement instructions are described in this video...watch part 4 of the video only, as other parts of video are made for different purpose !!!
After sucessfull cable replacement it is mandatory to calibrate brake axis by using MFG Configurator software !
You are free to replace only 1x cable which is faulty, and keep other cable as a spare in case of future failure. We sell these in a set as it might happen that you damage sensitive cable during process of installing it, so be carefull !