No back brake

[Ste715]

My back brake on my dirbi gpr50 just simply wont work i had a problem with the master cylander it was leaking but i fixrd it just needed ne washer but now there is no pressure in the brake i can hold it down and it dosnt even slow the bike down i tried bleeding it with a bleed bottle i bought from halfrods and no luck still nothing, any one had the same problem or know how to fix it ?
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S.j.Knox

[P.]

Bleed it properly. Undo the bleed nipple on the rear caliper and open your master cylinder.
Keep pumping the pedal until fluid starts coming out of the calipers bleed nipple.

Keep the master cylinder topped up while you pump.