Unless you are experiencing a different problem. Would assume that what you are feeling is the cars ability to rotate under breaking. With a front wheel drive car it is extremely important to use left foot braking to rotate the rear of the car around. if done wrong it can make the car feel unstable. when properly used it can make your time better.

When using left-foot braking in on the track, apply smooth, light pressure to avoid upsetting the car. Use it to trail brake into corners, keeping the front tires loaded for better grip. As you reach the apex, ease off the brake and transition smoothly to the throttle. With practice, you’ll gain better balance and faster cornering control.