No rear brake again

When I bleed the brake it take at 4 of 5 pumps of rear brake to get air out, that to me suggest air is up by the modulator and when air comes though its a lot.
In my opinion air is being drawn into system when the bike is stood for a long time and I think it could be aluminium washers used on the bangos to the modulator.Why the didn't use copper washers as this is the prefered for bangos as they create a better seal.
Also could it be not that they didn't torque bango bolts on modulator properly on some bikes ?
 
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