I apologize if this question has been covered already but I cannot find it . I am stocking up for a road trip on my QingQi and will be heavily loaded and travelling in mountainous regions for a few thousand km so I am sure to need to replace my brakes at some point.

This bike had front disc- brake and a rear drum-brake. What brakes pads should I get? The brake pads on taobao are so cheap (5-10 RMB), I can't believe that it's as simple as that. What about the drum brake, how does that work? I can't see any pads in the parts manual.