i have a huge problem regrading my brakes ... they are very loose !! on 2005 Chevrolet Aveo

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I have changed them 3 times but the same thing happen...
i started to think that the problem is not in the brake itself and that it could be in something else affecting its functionality

Does anyone know what i can do/change to fix it ???
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when i push on them the car doesn't stop immediately even if i'm driving in a slow speed ( 60 km/hr) it always takes a distance of 2-3 m to stop completely