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If you want to work on the braking system of your bike yourself, you will have to buy special tools. Especially on a bike with disc brakes, there are many small jobs that can only be done with specific tools. Think, for example, of straightening a bent rotor or pushing back the cylinders of a hydraulic caliper. But the most precise work comes when installing and maintaining the brake cables. It is an advantage to have good tools when you need to shorten a cable or put a cap on the end of it.