Replacing pads replacing front pads, the rotor is sticking on the right hand side. i have replaced the pads and rotors about a year ago and i dont understand why one rotor is sticking

a shimmy condition indicates it needs a wheel alignment
best take it to an accredited front end specialist shop for a proper diagnosis of the problem

pull off wheel and check brake pads low,caliper sticking ,or debris -if brakes look good than check hub-wheel bearing----- may be going bad

That would be the best thing to that way both sides match with brand
new parts

the noise is probably the ware sensors on the brake pads making noise the noise lets you know that the brakes are getting thin are are ready to be replaced.if you let this go to long you can damage the brake rotors, make sure you check to make sure the caliper is not sticking on the left side being this side is making more noise ,a stuck caliper can cause premature brake pads ware .

NO year, sorry dont expect good answers.
can be lots of things. (guessing is near useless, hands on wins)
get it serviced comes to mind.
right wheel bearings,
brake rotors cracked, (dangerous to max)
caliper slide seized.
caliper pistons sticking?
bad pads. or their parts (associated)
bad suspension parts.
loose lug nuts,
and more,
if car really old the right 4wd wheel lock bad. if not 2wd.
is car 4wd> ? and what year, 1999 they changed big time so......

caliper is sticking or pads are sticking ,proportioning valve with vehicle jacked up and supported and wheel removed inspect pads and rotor for damage excessive wear if good- turn hub/rotor by hand have someone assist u by stepping on brake observe brake caliper stop then release brake piston should release slightly from pad try turn hub again w/out touching brake if stuck in place replace and caliper released replace pads if caliper still clamped remove caliper and inspect for leak or damage compress caliper and try brake again if does if sticks again replace caliper

Did you replace the brake fluid and the master cylinder?

you need to grease the metal clips at the top and bottom of the pads (dont get grease on the rotor or pad though) and also spray some "disc brake quiet" on the back of the pads. it comes in a red can and the spray that comes out is like sticky red paint. do those 2 things and the squeals will be gone.

Interesting, disc brakes don't normally stick. Since there is no tension pressure against the pads like drum brakes.

You indicated you replaced the right caliper and the master cylinder, but no mention of the disc or the piston (Some caliper assemblies are all in one, some are not.)

Here are some thoughts:

Disc is contaminated with oil, grease, brake fluid etc, when you brake, it is absorbed by the pad, gets hot and sticks.

You didn't replace left caliper, piston isn't working well, sending all pressure to right side.

You didn't indicate, new, used or rebuilt caliper. If used, get anew/remanufactured SET of calipers and either semi-mettalic or ceramic pads, and new rotors (I used to get rotors turned, but new replacements are now generally cheaper that turning old ones. When working with brakes I always recommend you work them as a set, regardless of how good the other side looks.

Make sure you clean the rotors with a solvent to ensure any grease or anti-rust agent is removed and dry will with several paper towels.

When installing pads, ensure you do not touch the braking surface of the pad or the rotor, body oil can contaminate too.
Make sure that the siding surface of the caliper is lubricatred with silicone grease designed for calipers (little packets are available at your parts store) On my GM Cars, it is the bolts that mount the caliper, but this varies by caliper design

Hope that is

Sounds like your brake calibers are sticking. Get new ones and new pads. You probably should get new rotors also because with the dragging calibers they most likely got hot and are warped. Search on ebay and www.rockauto.com . I personally use power stop drilled and slotted rotors with mid grade pads. You can probably get a whole kit.