Most of the time when the brake is loose your shoes aren't adjusted correctly. Which pretty much means you have no rear brakes and your front brakes are doing all the work.
Not always true, brakes are hydraulic, e brake is a cable, possibilities are his cables are to short and stretched em flexing(like mine) or the self adjusters are not working and so he's not getting enough pressure to them.
If your e-brake handle feels like there's absolutely nothing attached
Do the cables underneath move when the handle is pulled?
Adjust the shoes first, then the cable