On my 1990 ford f150 i have to press the brake pedal down real far to get my break light to come on it seem to work fine when truck is not running only when i start the truck up

Mcmom, Either your brake pedal is not coming up far enough to the brake switch, or the brake switch is faulty. You may still have air in brake system not allowing pedal to come up high enough to contact switch, pull brake pedal all the way up and have a second person see if brake lights go off.
Links below to show brake switch location and show how brake pedal arm should come all the way up to turn off brake lights.
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How To install Replace Brake Light Switch 2004 08 Ford F150 and more...

Brake lights stay on

brake lights stay on Ford F150 Forum

most likely is ignition switch. it is adjustable. under the dash on the steering column there are two bolts that holt a square box onto the column. that is the ignition switch. may need to be slid down towrds the pedals. can be aggravating trying to fine adjust it. if that doesnt work, replace it. about 25$

Well,check for a vacuum leak,by starting it cold,and have someone keep it running while you spray some brake cleaner aT VARIOUS SPOTS WHERE VACUUM LINES MEET,or toward back of intake manifold,but not near air cleaner.
Any change in rpm down or up indicates a leak. don-ohio

the valve on the intake manifold that controls the idle and will speed up when AC is turned on ,i think the problem is here ,its not working right allowing air to by the throttle buttlefly causing the mixture to be out .so when ECU senses that the misture is weak it will overcompensate

check brake lightswitch on brake pedal if u have power to switch then replace the switch

I'm not positive what type axle you have but the order of parts should be the anti lock free running hub assembly, a lock washer then the wheel bearing lock nut. The lock nut could look like a thick washer with 5 or 6 holes in it.
But depending on your front axle you may have a rotor and hub assembly that's a single unit or they could be separate. If they are separate then you may need a sledge hammer to get the rotors off. Ford's front rotors can be a real pain in the a$$ to get loose. Regardless which type you have if the order of what you have taken off so far matches what I said then washer is probably the locking nut. The only way to get it off is a special spanner wrench or a punch and hammer. If you are still uncertain about it let me know and give the axle make and type and I'll be glad to help.
Good luck
If

well you need to check the fuel pump relay first there is no reset switch

when you changed your map sensor you should have reset the program, take out the negative terminal of your battery then press brake pedal 10 times slowly. then put back the terminal.

I have a 2001 Ford F150, my brake lights dont work. Ive replaced the bulbs, checked the fuses,and the brake switch on side of the brake pedal was replaced. I still dont have any brake lights. My third brake light works fine, along with my running lights,flashers, blinkers.

While I was working on my Ranger brakes, the engine would die if I pushed the brake too close to the floor. Once I replaced the leaking wheel cylinders and a bad front hose and the old worn out master cylinder.....and bled the lines real good, the problem went away. Getting the front bleeders loose was a real struggle. With much liquid wrench, vise grips, and careful hammering, they came loose. Cursing helps. The lines won't bleed right if you just loosen the mounting bolts. I put a little grease on the bleeder threads so maybe they won't be stuck next time.