Proton owners .. for wira/satria/putra... i need help

Anyone can tell me how can i adjust the handbrake ??... i pull to the max d .. but the car will still move if its on a hill .. down slope.. check brake pads still quite a lot.

I went to a mechanic .. he told me .. cannot adjust one ..
But another fren told me, can adjust the piston out a bit ..

Wat should i do ??..