Tyring to remove brake rotor on 2004 chevy aveo i have removed caliper and all other nuts there are two screws going threw the center area of the rotor not sure if they are related but when i tried removing them they just stripped

The rotor is not bolted to anything untill you put the wheel on although the caliper bracket does keep it from being removed i think only 2 bolts for the caliper bracket and 2 for the brake pads. If one is broke it must be fixed right away.

Hello, to replace the rear brake pads follow the following steps:

1. Lift the Chevy Impala with the jack and place it on jack stands.
2. Remove the wheels with a lug-nut wrench and set them aside. The lug-nut wrench can be found in the trunk of your Chevy Impala.
3. Remove the caliper with a ratchet and use a bungee cord to hang the caliper. Do not let the caliper hang from the brake hose, as the hose might break and cause fluid to leak.

4. Remove the brake caliper bracket from the steering knuckle with a ratchet. Set it aside.

5. Remove the break rotor from the hub. The rotor might require force to be removed; if it does, use a hammer to hit the rotor in the center, where the lug studs are located. Take care not to hit the studs.

6. Remove the new rotor from its packaging and use brake cleaner to remove the grease from the rotor. Grease is applied on the rotor in the factory to inhibit rust during storage.

7. Install the new rotor onto the hub.

8. Install the caliper bracket with new brake pads onto the rotor and fasten it to the steering knuckle. Use a ratchet to tighten the bolts.
9. Open the master cylinder reservoir so you don't break a seal while compressing the brake caliper.

10. Compress the brake caliper with a C-clamp, so that the caliper can fit over the new brake pads. Install the caliper by securing it to the brake caliper bracket with a ratchet.

Thanks

Front hub bearing, remove tire, remove caliper and caliper holding bracket, you do not have to remove brake caliper from brake hose, just set it aside, if 4X4 remove front axle nut that goes through center of rotor, also remove brake rotor, disconnect elec, A.B.S connector, remove three bolts on back side of hub bearing, remove hub bearing, some times you will need to knock hub bearing out with a hammer.Reverse to install new hub bearing.

If they are not worn beyond tollerance they can be machined on the vehicle.
Also make sure its not tyres or wheel bearings.

remove wheel
remove brake caliper( leave the hose connected)
remove centre cap
remove split pin and lock
unscrew bearing hub nut
rotor should come off
fit new bearing races in new rotor
grease new bearings
fit inside bearing and seal
refit rotor, outer bearing,washer,nut,lock, splitpin and centre cap
(tighten nut until no play in bearing plus 1\8 of a turn)
refit caliper and wheel
bleed and test brakes before driving

Slightly loosen tire lug nuts, raise car with jack, remove lug nuts and wheel, remove caliper bolts from brake calipers. Open cap on brake fluid reservoir, place folded towel over top of reservoir and set cap on the paper towel to hold it in place, use a large 9-inch C-clamp to squeez in on front brake pad about 1/8 inch. REmove caliper from rotor. Hang caliper from shock coils with strong bungie strap so there is no pressure on the brake line. Remove bolts from caliper plate and remove caliper plate. Using oversized phillips screwdriver end attached to a 3/8 inch flex wrench, you will carefully put light pressure in a counter-clockwise direction to remove the brass screws and tap the flex wrench at the same time with a large 3-pound hammer driving the screwdriver end into the top of the screw as you put more pressure on the wrench to loosen the screw. This is about the only way to remove brass screws without "damaging them" and they are a dealer item not found in parts store. There should be two screws holding the rotor on. Then spray liquid wrench or penetrating oil into all holes on rotor toward center to help dissolve rust. Wait three minutes then tap rear of rotor lightly with large hammer taking care NOT to hit the thin metal rotor shield. Eventually, this tapping force will loosen the rotor. Use same technique of tapping the flex wrench when applying pressure to wrench to tighten the brass screws when replacing the rotors.

If wheel and calipers are off, and no retainers on studs, spray some penetrating lube in center of hub where rotor slides over hub shoulder. Let it sit for a minute or two, then place a block of wood against outside edge of rotor and hit block with a hammer. May have to give it a good hit, around perimeter in a few spots to get it to jar loose in center at hub. Usually just rusted. Better if you have a big rubber mallet, and hit hard all around outside area of rotor, but block of wood will do the job as well.

REMEMBER TO REPLACE THE PADS AS WELL, NO USED PADS ON NEW ROTORS.

Raise the vehicle and support on jack stands. Remove the wheels. Place the drip pan under the caliper. Loosen the 10 mm bleeder screw on the top of the caliper.

Step 2 Spread the brake pads apart with the common screwdriver. Place the screwdriver in the slot in the center of the caliper where the pads can be seen. With the nose of the screwdriver, pry between the rotor and the pad and pull the caliper outward toward you. The piston is being depressed into its housing as the caliper is pulled out. When the caliper comes to its limit outward, push the caliper back away from you and insert the screwdriver into the inside pad between the pad and the rotor. Once again pull the screwdriver toward you until the caliper piston is compressed into its bore.

Step 3 Tighten the 10 mm bleeder screw. Remove the caliper and support it where it is not hanging on the brake hose. Letting the caliper hang on the brake hose will damage the hose and cause brake failure.

Step 4 Remove the caliper support if it interferes with the removal of the rotor. Some vehicles don't require the removal of the support. Remove the rotor by pulling it off. If it is stuck, hit it with a hammer a few times between the studs.

Step 5 Install the caliper support and caliper in the reverse order they were taken off. Install the wheels and let the vehicle down. Check the brake fluid and fill as necessary to the proper level.

Step 6 Start the vehicle and pump the brakes very slowly until you have a high pedal. Remember that by expanding the calipers they have to re-adjust. You will not have any braking when you first start the car. Do not try to move the car until you have pumped the brake pedal sufficiently to feel a firm pedal.
Rear-Wheel-Drive Vehicles

Step 1 Raise the vehicle and support on jack stands. Remove the wheels. Place the drip pan under the caliper. Loosen the 10 mm bleeder screw on the top of the caliper.

Step 2 Spread the brake pads apart with the common screwdriver. Place the screwdriver in the slot in the center of the caliper where the pads can be seen. With the nose of the screwdriver, pry between the rotor and the pad and pull the caliper outward toward you. The piston is being depressed into its housing as the caliper is pulled out. When the caliper comes to its limit outward, push the caliper back away from you and insert the screwdriver into the inside pad between the pad and the rotor. Once again, pull the screwdriver toward you until the caliper piston is compressed into its bore.

Step 3 Tighten the 10 mm bleeder screw. Remove the caliper and support it where it is not hanging on the brake hose. Letting the caliper hang on the brake hose will damage the hose and cause brake failure.

Step 4 Remove the bearing cap in the center of the rotor. Remove the cotter pin. Remove the large nut that retains the bearings and rotor. Wobble the rotor with your hands and the front bearing will come out.

Step 5 Reinstall the spindle nut with just a few threads. Grabbing the rotor with both hands, pull the rotor off with slight down pressure and with a quick ****. The spindle nut will grab the rear bearing and seal as you pull the rotor off and come out at the same time.

Step 6 Install the bearings into the new rotor. Grease the bearings first and install the rear large bearing then install the grease seal with the hammer. Install the rotor on the spindle and insert the front small bearing followed by the large washer and the retaining nut.

Step 7 Tighten the retaining nut just until there is no longer any freeplay then tighten an additional 90 degrees. Do not over tighten the retaining nut as it will not allow the bearings to expand and they will wear out rapidly. Install the cotter pin.

Step 8 Install the caliper support and caliper in the reverse order they were taken off. Install the wheels and let the vehicle down. Check the brake fluid and fill as necessary to the proper level.

Step 9 Start the vehicle and pump the brakes very slowly until you have a high pedal. Remember that by expanding the calipers they have to re-adjust. You will not have any braking when you first start the car. Do not try to move the car until you have pumped the brake pedal sufficiently to feel a firm pedal

jack up the rear of the car remove wheels and tires, remove the two caliper bolts, remove old brake pads, using a c clamp push each piston the the caliper bake in install new pads, reinstall caliper install wheels and tires lower the jack and your done
caliper bolts are torque head bolts be sure to have the proper size before trying to change the brakes

REMOVAL & INSTALLATION Front Brakes

1. Raise and safely support the vehicle.
2. Remove the wheel and tire assembly.
3. Unfasten the disc brake caliper retaining bolts.
4. Remove the disc brake caliper and secure the caliper aside with mechanic's wire. Do not disconnect the brake hose.
5. Pull the brake rotor from the hub.
6. Inspect the rotor and refinish or replace, as necessary. If refinishing, the minimum thickness rotor thickness is stamped on the brake rotor.
7. To install:
   
8. Place the brake rotor to the hub. Make sure the mating surfaces are free of rust which may prevent the brake rotor from seating properly.
9. Remove the mechanic's wire and position the brake caliper.
10. Install the brake caliper retaining bolts to specification.
11. Install the wheel and tire assembly.
12. Lower the vehicle.
13. Pump the brake pedal several times to position the brake pads before moving the vehicle.
14. Road test the vehicle and check the brake system for proper operation.

It sounds like your hub/rotor is froze on....you'll need to apply some penetrant in the lug stud areas as wells as the area where the rotor mates to the axle hub.

If you are talking about the brake rotors, you do NOT remove the 30 mm nut. That nut just holds the axle shaft to the hub. Remove the caliper and the caliper bracket, the rotor should come off, you may have to tap the brake rotor to dislodge it from the center hub.