Every bike without ABS would skid when you press the brake tightly. No matter it's tyres are thick or lean, they will get locked in a state and slip all the way till the front brake ends up the effect or the speed comes down to zero. You should apply both the brakes equally in order to get the best out of your brakes. While you will drive the bike more, your foot will have more experience on the lever and you would automatically press it to the locking limit. You can even ask the mechanic to set the wire according to your pressing style.