Disk brakes should appear as shiny plates with the calipers on top and in full view. Drum brakes will appear as a 'bowl' which make telling them apart instant.
You have to measure the inside diameter of the drum.
It depends on the model, the lower end packages did, but the higher end ones had 253mm disk brakes. The best way to tell is to look, if you see bright metal, it's disk, if you don't, its a drum.
If you can see the brake caliper and rotor, then it has disc brakes. If all you see is a large drum then it has shoes. If you can see the front brakes thru the wheels, you can identify disc brakes. If the rear look like the front, then they are also disc brakes. However if the rear look much different, then chances are they are drum.
The drum brakes are in the rear of most passenger cars and trucks, disc brakes are typically on the front of the vehicle. It is also the most widely used brake than any other brake style.
The DX and LX models with the 4 cylinder engine have front disc and rear drum brakes. The LX and EX models with the V6 engine have four wheel disc brakes. You can tell these cars at a glance by their five lug wheel hubs and dual exhaust pipes. The 4 cylinder EX models come with front disc and rear drum brakes standard, but if they are equipped with antilock brakes (ABS) then they come with four wheel disc brakes.
Your car came with the option of having rear disc brake or drums. The simple way to tell is to look the the wheel and see if you see rotors if you dont see rotors than you have drum brakes
i cant tell you exatly how to do it but i can tell you how to figure it out i hope it is not tore apart already, if not my honest advice is to jack up both sides take both drums off, replace the pads from one side at a time. if it is already torn apart go to a junk yard with a digital camera, and take a pict of any GM rear axle with the brakes on it but no drum GM has been using the same setup for its drum brakes since the early 60s
Rear brakes do not have to be replaced too often. It's really hard to tell without looking at it. What you can do is to replace front brakes and test drive it, if you feel that your car brakes works just fine you do not need to replace rear brake shoes.
you need to get a repair manual for that as there is just too much to tell in writing, when you tear them apart only tear one side apart at a time as you can look at the other side as a reference.
http://www.civicforums.com/forums/43-wheels-tires-brakes/207991-diy-drum-brake-shoe-replacement.html This should tell and show you all you would need to know.
It is a cause and effect thing. Was the other axle inspected if all the brakes, front and rear, were not replaced? Can you tell where it's coming from at all? Is the noise identical from when before the brakes were replaced? Year, make, model and mileage would help as well. Drum on rear? Don't assume the brakes were done correctly. Believe it or not, I have done a few where someone put the pads in backwards with the backing plate against the rotor. If someone worked on it for you, take it back to them and complain.
Take the wheels off and measure the diameter of the brake rotor (disc) or drum with a ruler or tape measure.