have front brake pads been checked to make sure they are free in callipers,and also pistons are free to move and are not siezed.also make surebrake pedal return spring is not broken or missing,if all ok then suspect front flexible hoses for internal degradation.just another point,make sure there is a small ammount of play in brake pedal before it touches/moves foot valve. hope this helps.
k
August 2015