when starting check brake system comes on but brakes r in good condition...y? on 2008 Ford F-350 Super Duty

also it takes 2-3xs to start ... sounds like it will start and will crank 3 xs then stops ... will start when jumped no problems ... battery is between 12.9-14.2 (thereabouts) ... lots of white smoke eventhough it is out on country roads approx 75miles a weekend at 60mph ... normal short drives during the week ... can it be the high pressure fuel injector pump or oil pump? tank delamanation?

2 answers 2 comments
what motor do you have and is the brake fluid full?
brakes fluid is good and it's a diesel 6.4
check fluid level
fluids all checked and full