so i have replaced my rear wheels cyls about 3 times now,
and its getting to the point where i don't know anymore,
so the first time i through it was a shit part so i got new ones did the same thing,
so i replaced the brake master and cleaned all the lines out,

so today i fitted in a brand new pair
i put them in and waited for the brake fuild to come thru then i pumped it and bleed them and what not,
so then to check everything is all good i pull the shoe off and the left side popped off,

so now I'm frustrated Click image for larger version. 

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so what could be causing this?
and is the rear wheel cylinder fix able