02 dodge ram 1500 4+4.Shaking in front end only when brakes are applied.Turned b oth front rotors,no difference.Right front caliper hung up previously,"Long time ago"Replaced R.F caliper.A surging motion can be felt when lightly applying brakes,like grabbing and letting go.Still seems like warped rotor??

CHECK DUST PLATE FOR TOCHING ROTOR

You need to have the front rotors turned or replaced. Take a set of dial calipers and measure the rotor thickness. compare that to the specs on the rotor and that will let you know if you can turn them. Put new pads on and make sure to lube the slider pins.

Calipers come left and right. Rotors are interchangeable.

Possible warped rotor. Have you tested for this?
If too far gone, they sell 'em reconditioned.
If not too far gone, you can have rotor "turned" on special lathe (recut) to flat and parallel so it won't bind.
If perhaps rotor has been turned too much, caliper may not permit pistons to retract. Try installing a shim thicker than the rotor and see if it retracts.

more than likely you need to have your brake rotors resurfaced or replaced

Your rotors are warped. You also probably need to brake pads. Take your rotors off and inspect them for cuts and grooves. If the surface is not flat you'll need new ones. If not take them to a machine shop and have them turned. Turning your rotors will cut them down until the surface is perfectly flat and not warped. The shaking is cause when the rotors are warped and you press the brakes and the rotor applies more pressure where it's high and less where it's low, thus causes it to shake

New revised calipers. and have the new rotors machined right out of the box before installing

1. Raise and support the front end on jackstands.
   
2. Remove the wheels.
   
3. Press the caliper piston back into the bore with a suitable prytool. Use a large C-clamp to drive the piston into the bore of additional force is required.
   
4. Remove the caliper mounting bolts with a 3/8 in. hex wrench or socket.
   
5. Loosen the bolt that secures the front brake hose fitting bolt in the caliper.
   
6. Rotate the caliper rearward off the rotor and out from its mount.
   Mounting bolt lubrication points—Ram Pick-Up 75mm caliper
   Mounting bolt lubrication points—Ram Pick-Up 80 or 86mm caliper
   
7. Remove the front brake hose fitting bolt completely, then remove the caliper with the pads installed as an assembly. Take care not to drip fluid onto the pad surfaces.
   
8. Cover the open end of the front brake hose fitting to prevent dirt entry.
   

To install:

1. Clean the caliper and steering knuckle sliding surfaces with a wire brush. Then, apply a coat of Mopar® multi-mileage grease or equivalent.
   
2. Lubricate the caliper mounting bolts, collars, bushings and bores with Dow 111® or GE 661® silicone grease or equivalent.
   
3. Install the caliper over the rotor and seat it in its original position until flush.
   
4. Install the mounting bolts by hand, then tighten them to 38 ft. lbs. (51 Nm) on 2001–02 models; 24 ft. lbs. (32 Nm) on 2003–05 models.
   
5. Attach the brake hose, using new washers, and torque the bolt to 20 ft. lbs. (27 Nm).
   
6. Install the wheels.
   
7. Lower the vehicle.
   
8. Pump the brakes several times to seat the pads.
   

You seem to have more than one problem, first of all the balding tire you have a negative camber problem that can be adjusted by getting a wheel alignment done. The shaking problem while applying brake could mean that you have bad/warped front rotors. It can also mean bad Tie rods. Lastly it can mean that the front tires needs to be high speed balanced. Good Luck

get a c-clamp and take one of the old pads and place on the caliper piston. screw the clamp till the piston is fully seated. make sure to apply pressure evenly to not damage the seal.

do one side at a time or you may cause the other sides piston to pop out of the caliper. if both sides are already disassembled, you can take the old pads and place them in the other caliper, so the piston movement is limited.

after the piston is seated, put the new pads into the brace, it should be fairly obvious where they go. put the caliper on the bracket and install and tighten the bolts.

I would suggest buying a repair manual from an auto store, especially if you have never done a brake job before.

hope this helped.