Brake Caliper How do you tell which is the right and the left caliper on the front of a F150 1985 modle?

Generally, this means the left side brake is engaging before the right front brake. So, check the right front brake pads and caliper to make sure they are free floating and not stuck with a little rust. Sometimes, backing up quickly and hitting the brakes kind of hard can break free the disk pads/caliper, but I would recommend taking a look at the brake pads and caliper to be sure they didn't get stuck in place.

I think the problem is the brake pad or caliper, brake pad are too thick or the caliper are not good casted.
First try to confirm if you get a right brake caliper ,then confirm the brake disc ,brake pad, if they all ok, tear down the bracket of caliper, put into brake pad, then put into brake rotor.
http://www.fiverhope.com/category-4-b0-Brake-caliper.html

The first thing is to make sure the caliper piston is all the way in, the caliper then slides over the brake pads and bolts on, make sure you have the correct caliper on the right side, the way to know this is when caliper is on the little bleeder screw should be on the top, if it is on the bottom then wrong caliper, try the other one,

After caliper is on you will then need to bleed the brake system,
This all depends on what happened, if the brake fluid did not all leak out and caliper was just bad then before removing brake hose off old caliper pinch rubber brake line with a pair of needle nose grips or there is a line crip tool that crips hose to avoid fluid from leaking out. this makes bleeding easier , other wise you will need to make sure fluid is full and start at the right rear wheel bleeding and move to left rear then right frt and last left front, you will need to keep an eye on the level of brake fluid and add as need to keep it from going empty,
you will need some one to pump and hold brake while you bleed them, pump pedal three times and hold down while you open bleeder screw, this is to be done to every wheel about four to five time to make sure all air is out . good day. note if pedal feels low bleed again wont hurt anything just a little more fluid lost.

it could be a flex hose between the caliper and the steel line

Start at the right rear wheel, while having someone in the driver seat, have them to apply pressure to brake peadle while you open the bleeder valve located at the top of the caliper. After fluid stops coming out of the bleeder valve close valve, and person in the driver seat can release pressure off of brake peadle. perform this till all air is out at each caliper. Right rear first, then left rear, right front, and then left front, be sure to check brake fluid level after each caliper is bleed.

If the caliper is seizing and it is not the caliper it is the module that controls how the brake fluid is distributed. I don't have my book in front of me at the moment but when you look under teh hood on teh drivers side you will see a block that has the brake lines coming out of it. That is part of teh ABS system is one is installed and is a master brake control hub if it ABS isn't installed. being that new I would assume it was equipped with ABS. There are a couple of ways you can test if this is teh problem. If I remember correctly the MPV brakes with all 4 brakes, that means you can, as a temp test, switch the lines to see if the caliper problem changes to the different caliper. If it does then you know for a fact it is that unit and not the caliper. Also, something to consider, the caliper that is locking maybe locking because the problem is actually the caliper on the opposite side. If the caliper on the left front is stuck in the open position, on occasion that will cause too much fluid pressure to the right front giving you the impression the problem is the right side and it isn't. This is rare but certainly a possibility. As a general rule you should always replace Calipers in pairs. If you replace the right front you should replace the left front, same with the rear calipers.

Replace both calipers, much easier..... your description indicates to me that your left caliper is hanging ON, overheating and when brakes are applied, the right caliper (not overheated) is more efficient than the left one......

ALL brake work must happen to BOTH SIDES, on that axle set, every time (meaning both front or both rear). Anything else just makes problems

The hard part is pressing the caliper piston abck into the caliper so you can get the new, thicker pads over the rotor. A large C Clamp works best.

SECTION 206-03: Front Disc Brake 2001 Villager Workshop Manual
REMOVAL AND INSTALLATION Pads —Front Disc Brake Removal

1. Remove the wheel and tire assembly. For additional information, refer to Section 204-04 .

1. Remove the front disc brake caliper bolts. torx bit. T20?

1. Support the front disc brake caliper from the front strut and spring assembly using mechanics wire.

1. Remove the front disc brake pads.
   1. Remove the outboard front disc brake pad.
   1. Remove the inboard front disc brake pad.

Installation

1. CAUTION: Make sure the master cylinder reservoir does not overfill and spill brake fluid while retracting the front disc brake caliper piston.
   NOTE: It is necessary to fully retract the front disc brake caliper piston in the bore before installing the front disc brake pads.
   Install the front disc brake pads.
   1. Install the inboard front disc brake pad.
   1. Install the outboard front disc brake pad.

Caution. The outer pads are left and right. put left on driver side.

1. Position the front disc brake caliper on the front-wheel knuckle and install the brake caliper pin bolts.

1. WARNING: It is necessary to depress the brake pedal several times to position the front disc brake caliper piston before driving the vehicle.
   

Start from right rear, then, left rear, right front, left front. Fill master cylinder. Have helper sit in car, have helper hold brake pedal down. open bleed screw. fluid and air comes out. close screw. release brake pedal. Continue until no air comes out. Move to next wheel. Keep an eye on master cylinder fluid level after each wheel.

Try replacing the brake hose to that caliper, they collapse on the inside.