A quick trick to help you on your way to bleeding the front brake on a CG125, it may well work on other bikes too. You can do this without touching the bleed nipple on the caliper. Put the bike on the center stand. With brake reservoir open turn the handle bars gently back and forth. Now pull the brake lever a little and a big bubble of air should exit the system. Continue until you feel pressure in the system. Once you have pressure move onto the bleed nipple just to get any last little bit of air out of the system if needed, I always open the nipple when the system is pressurized and shut when the pressure has dropped still keeping the lever pulled to the handlebar.

It does work, bike went straight through the MOT no problem, brakes are as good a CG's brakes can be.