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Most drivers are cautious and brake too early.   Why?  They brake early to reduce the chances of overshooting the corner or spinning out.    

Too much brake and the tyres will lock and could cause the driver to lose control.   

Actually, too much brake is not necessarily a bad thing as locked tyres still result in reasonable braking distance.  Locked tyres will increase braking distance slightly compared to optimum braking and add 0.1 to 0.3 second to your time  

Locked tyres also reduces kart control and increase tyre wear.   

Maximum braking actually occurs just before tyres fully lock up – the tyres intermittently screech under brakes.  This is called threshold braking.     

Braking is one of the fundamental skills that need constant attention.   The brain needs to learn the correct amount of foot pressure for threshold braking.   This comes with practice – lots of it.  On practice days, spend a percentage of your time focusing on braking.   If you can consistently find the threshold braking point enough times, your subconscious brain will begin to remember the appropriate amount of foot pressure required.  Brake pressure should be applied quickly, smoothly and firmly.  Stomping on the brakes very fast should be avoided as it unsettles the kart. After lots of practice days, braking will become somewhat automatic, allowing you to apportion concentration on other important elements such as traffic or correct line.  

Every brake system as a certain amount of slack before the pads engage with the disk – i.e. the first movement of the brake pedal takes up this slack.  This movement can be excessive particularly if the brake pads are worn.  Taking the slack out of the system doesn’t mean that you will brake quicker.  It does, however, have an impact on timing.  For example, let's say that takes 1/10th of a second to take up the brake slack, you would have to apply brakes 1/10th of second earlier than brakes without any slack.  The end result should be that the brake pads engage with the disk at the same point on the track irrespective of the amount of slack.  
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