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?

Asked by for the 2008 Ford F-350 Super Duty
what motor do you have and is the brake fluid full?
brakes fluid is good and it's a diesel 6.4
1 more answer , 1 more comment
check fluid level
fluids all checked and full