Sir why do not you simply buy an Altis or late 2006 2.0D Saloon with ABS or new GLI, that will be much better for braking.
It can be really dangerous to alter the stock suspensions and/or brake mechanism.
If you want the best braking, Vitz/X Corolla and Eagle Eye VTI are best.
Alternatively, you can change the tires to Bridgestone Adrenaline RE001 or Dunlop SP Sports 9000, 205/50 R15.
Regards