change the pneumatic/hydraulic assistance from the pedale brake command.
this problem has been report on many Leaf (very high difference between the regeneration braking and the mecanical brake level of the pedal).http://www.kiapartsnow.com/genuine/kia- ... 4u500.html
Otther tip before you drive :
1) activate your car (ON)
2) pump on the brake pedal (5 times)
4) ALWAYS use the electric brake parking (auto-disabled when you move from P to D or B).
do the same everytime you take the car (or when you activate the ON/OFF switch).