In many Polish cities, an increase in investments in the area of cycling infrastructure can be noticed. This is a direct result of increased interest in cycling as a means of everyday transport as well as a way to spend free time. Forecasts show that this trend will continue and interest in cycling will not diminish. Therefore, it seems advisable to pay attention to a number of aspects related to the operation of this type of transport, including the most important system in which the bicycle is equipped, i.e. the braking system. The article presents selected problems regarding the operation of bicycle brake systems.