New rider question
Hello there, I have come to love riding tandems so I recently bought a Burley Bossa Nova. In addition to the wonderful Magura HS-66 rim brakes(I am a big fan of Magura products) it also has a rear drum brake. I am unfamiliar with drum brakes in general. Why the redundancy of having a 3rd brake? Is there a place I could learn about care and service of drum brakes? Any info would be very much appreciated. Thanks, Allen