Vacuum booster for brake servo

My brake car perform poorly.
Previously I have replace single layer  servo with double layer servo.
But I seem it did not change anything.
Then I remember there is an aftermarket product (2nd picture) to increase vacuum for brake servo.

I use water bottle to replicate that product.

Connect a hose to the bottle end and the other hose connect to brake hose (connect after one way valve).

AAs a result, I can feel better brake performance and less use feet power to brake.

Door Unlock Switch

Usually in old car and using aftermarket alarm, there is no dedicated switch to unlock door.

So people put a reset switch at a dashboard to unlock the door without pulling the unlock knob.

When I replace alarm into my car, I have extra reset switch and I use that switch as door unlock switch. 

It's very convenient place to put unlock switch instead put it at dashboard.