I have a 1 yr. ferris mower 2000z 61'' It dies when apply brake.

check the safety switches

engineering standards say around .012" inlet hot and .014" exhaust hot ( air cooled engine )
lowest setting would be .010" hot inlet and .012" hot exhaust ( air cooled or water cooled )
get the exact settings from a mower shop

You need to write to Ferris.

Sounds like your seat switch isn't working. Operator presence (seat switch activated) is required when the brake is released & pro is engaged or your engine will shut down.

If the mower has sat with fuel in the tank, fuel is probably bad. Drain ALL existing fuel in tank, apply fresh fuel. Then see what happens. Have had this happen to me many times, not only w/mowers, but chain saws, edgers, etc. Worked just fine after dumping bad fuel then using fresh gas. Got 'em all going. Let us know if this was your problem.

safety switch in the seat and in the brake. if one of those is open, engine will die when you engage the blades. Owners manual should have wiring diagram so you can bypass switches to test (if you have brake applied and are sitting in the seat and that is when it is dying).

You and me both buddy.

i think that one is around a quart and a half

Check seat SW.

There is another safety switch connected to the parking/service brake. Check that one too. Sounds like its the one.