Replacing front driver side (F150) brake line (rubber hose)

You mean leaking? It should be easy to see where it is leaking. Often it is the rubber hose attaching the steel tube from the car frame to the brake caliper on the wheel.
If you need to see exactly where the fluid is leaking out, just put a little fluid into the master cylinder reservoir, and look at the caliper on the wheel while someone presses the brake pedal. You should be able to see if the leak is from the hose, or the brake caliper.

The hose can be replaced for just a few dollars, but it is a job for someone experienced in mechanic work. Once the new hose is on (or the new or reconditioned caliper if that was leaking), the brakes must be bled, all four of them.

May be a restriction in a hose or a piston not retracting into caliper.

Are there two brake fluid reservoirs? And are both full? This would be a split-diagonal brake system-front driver and rear passenger are one brake system. Front passenger and rear driver are the other system. You have the one system working-the front passenger and rear driver side works. You will have to keep bleeding the rear passenger side and the front driver side-always start farthest from the master cylinder, but if that wheel just won't bleed air out, make sure the driver front is working and bleeds good. If all else fails, there are pressure bleeder kits available, I don't know the cost, but they work great. They are also a one man bleeding job, as I understand.

I had something similar on my old 92 dakota

In my case it was the rear only abs hcu unit

Your rubber hose goes to either the brake tube from
the front of the truck ( rear feed) or to as you said some
other brake component.

You should be able to determine where the leak is &
if you have to replace a component unknown to us,because of rust & leaking- the dealer will be the source

The auto parts stores stopped having intellegent life about
25 years ago,they can't keep up with technology & your dealing
with young non car guys.

At the dealers parts counter they will show you on their computer
a picture of your frame & unknown part- if you even need it

Most likely you will be fabricating a rusted brake tube,hang in there

all dodge caravans from 2002 through 2011 have known problems with sticking calipers. if you google caravan brake problems you will see all the complaints. there are TBI's and recalls on them. I have a 2005 dodge caravan in my garage with all 4 calipers locked up. It is a good idea to replace the brake pads with the best ones and new rotors to

If the caliper is ok, and the pads do not release, I would try the flex hose next.

You might have a collapsed brake hose going to that side. It will be the rubber line from the caliper to the frame. You cant tell by looking at it but the inside of it might have collapsed not allowing the fluid to flow back, and only allowing it in. Ive seen this happen before.

Check front end steering linkages for any play, as well as rear brakes for sticking or grabbing as well. Not unusual for a rear brake grabbing, to cause front end to want to wander.

Change the hoses from your calipers to the frame. It's a rubber looking line. Inside of those lines there is a valve and if that valve is not functioning properly, when you release the brake pedal it doesn't allow fluid to come back to the resevoir and therefore gives you the feeling you are driving with the brake on. Change them both sides and see if that helps

Probably a restriction in the brake line from the master cylinder to the wheel.

Most of the time brake hoses do this (collapsed hose or hose inner liner) but the restriction could be anywhere from the point your front brake pressure divides to both wheels to the caliper of the wheel. The problem is not the caliper itself because the bleeder is able to relieve the pressure.