I am new so hi and be easy on me

Anyway got a gs300 facelift and the brakes are rubbish pedel goes to the floor, but i have had it on the toyota diagnostics machine and everthing comes back clear
no faults at all but still brakes are not right.

If u pump brakes fast it spits the dummy and all vsc light come on and buzzer for about 30secs is this normal?? also during this time the brake fluid goes up in the tank again is this normal?

i tried bleeding the brakes but still not good at all tried bleading through toyota machine as well.

pump can be heard and does go off after 30secs is it just air in system???? i dont get it

Toyota doesnt have a clue and they have the same machine as lexus

Any ideas as seached for info and my eyes are starting to bleed with the pain.