A vacuum hose in BMW is a flexible rubber connection that maps manifold vacuum to different parts of the vehicle. With age, a vacuum hose becomes brittle and stays highly susceptible to crack. A cracked vacuum hose makes it difficult for a BMW operative to maintain a stable RPM. Also, it can cause unwanted stalling. Since vacuum hose leaks cause loss of power, so if you find a leak in the vacuum hose, just make an appointment with a BMW specialist to have the things inspected and replaced if necessary.
