That sounds likely but which is the spring nut? I'm struggling to find any online guides/videos for these brakes.
@amey I tried a bit of lube but made no difference. They feel stiff to squeeze in by hand, more so than the front one, which makes me think it isn't the spring.
I had the same problem with the brakes on a B75; loosen the bolt in front of the spring that's holding it in place. Remove spring apply grease where it goes into black plastic part and reassemble.
That sounds likely but which is the spring nut? I'm struggling to find any online guides/videos for these brakes.
@amey I tried a bit of lube but made no difference. They feel stiff to squeeze in by hand, more so than the front one, which makes me think it isn't the spring.