What does the light that look like 2 arrows facing each other on the corolla means?

Sorry 4 weak eng.

In auto transmission cars when u break suddenly, it sounds and u feel like brake didn'nt worked properly.its like air in brake paddle.

There is a two arrow sign in dashboard and to fix it , there is a button (in right handed cars). Move ur left hand under dashboard between the area of steering and ashtray and press that button untill two arrow light is on or off.

Actually this button fix's the brake problem