need help with brakes

So i unplugged my booster from the valve and had tons of sucktion, but the brakes didnt change at all, so i put it back on after i drove around the block, and went to work, came back started my truck up, and now the whisting is gone, and brakes seem to be doing better more i drive it, but also, is my master cylider suppose to be so lose the contailer part, like it feels like i can pull it off. is that how it is suppose to be?

It is mounted on rubber so it should wiggle a little but not like it's abut to fall off at any moment
 
So I plugged the booster this time after I un-plugged it, and there's a huge differentence in the oedel it's self, so that means the booster is good, right?
 

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