A universal brake fluid hose measuring 120cm/140cm in length, suitable for bikes, is a flexible conduit designed to transfer brake fluid within a bicycle's braking system. It is crucial for ensuring effective and reliable brake performance. When searching for such a hose, consider factors like material compatibility with brake fluid, proper length, and fittings suitable for your bike. Explore options at local bike shops, online retailers, and automotive supply stores, and prioritize safety by consulting experts or referring to your bike's user manual during installation.