are you asking how to reattach the front brake cable? you need to clamp the end under the bolt at the top of the brake arm, then slot the end of the noodle (metal tube) into the bracket on the other arm. adjust the tension by pulling enough slack out of the cable before tightening the bolt so that the wheel spins freely without hitting the brake pads and pulling the lever provides enough force to stop the bike. if the cable is broken you might not have enough to work with, and you’d need a new brake cable. they’re not expensive and not hard to replace. you can find better tutorials by looking up park tool on youtube.
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how to service v-brake : [https://www.youtube.com/watch?v=jBG-fIRtTHs&list=PLCNxa_dh32V0L7jv9cjyJtFNMQZ0TDmpC](https://www.youtube.com/watch?v=jBG-fIRtTHs&list=PLCNxa_dh32V0L7jv9cjyJtFNMQZ0TDmpC)
are you asking how to reattach the front brake cable? you need to clamp the end under the bolt at the top of the brake arm, then slot the end of the noodle (metal tube) into the bracket on the other arm. adjust the tension by pulling enough slack out of the cable before tightening the bolt so that the wheel spins freely without hitting the brake pads and pulling the lever provides enough force to stop the bike. if the cable is broken you might not have enough to work with, and you’d need a new brake cable. they’re not expensive and not hard to replace. you can find better tutorials by looking up park tool on youtube.
[here is a diagram](https://cyclingguru.in/wp-content/uploads/2022/12/V-Brake-Components.jpg) of the parts of your brake system, called v-brakes.
in the future i’d recommend posting questions like this on r/bikewrench