Bought a brake caliper for the right front of my 2002 Chevy Malibu and the bleeder screw won't open.

If your brake hose collapsed internally that will cause brakes to lock to be sure its the hose and not the calipers open the bleed screw and see if the rotor release. If they stay locked then maybe calipers seized try to pry brake pads apart with caliper mounted and brake bleeder open if they return easy then change your brake hose.

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.

The bleeder will be on the brake caliper itself. One bleeder on each caliper on the front. IF you have rear disc brakes it should be on the caliper on the rears too. Somewhere near the side or the top of the calipers.

no,to gravity beed just open bleeder remove master cylinder cap & dont let it go empty.
if you only opened the front you may just need to bleed the front.some times pumping up
brakes before bleeding will help start the gravity bleed.

good luck

Brake caliber is stuck replace it

Unscrew both end's of brake hose,remove old hose and install new one, don't forget to used both brass washer at caliper end on hose (should come with new ones) after you have brake hose on open caliper bleeder vale, I belive it's a 10mm, will be on the very top of caliper point up, wait till you have brake fluid coming out ( don't let your master cylinder get empty of brake fluid, after you see brake fluid coming out close bleeder valve, now have some one pump the brake peddle about 5 or 7 time's and hold peddle down, open bleeder to let air out keep doing this till on more air come's out of bleeder valve and your done.Good luck,hope this was very helpful.

Check there is pressure coming out of master cylinder to front brake circuit If there is open bleeders on calipers if pressure there calipers are seized if not renew flexible hoses on front struts & bleed brakes

THERE IS A BLEEDER NUT ON EACH CALIPER,ONE PERSON BLEEDS AND THE OTHER PUMPS THE BRAKE PEDAL

they are always on the top back of caliper.on inside,

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.