Single.
dual
Single piston, if it has disc brakes on the rear axle... some GM models still used drums for that MY. Not sure if the Tahoe did or not.
Yes
be sure to purcahse the tool to "screw" the caliper piston in. If you try to push the piston in on rear disc brakes you will damange the caliper.
To push the piston in you need a special tool. The rear disk brakes on this car screw in. So you have to turn them to the left while pushing in and this requires a special tool to fit the piston.
Cailbers have NO adjustment. They have a piston that moves in and out as the brake is pushed down.
Use a "c" clamp (front) to slide piston into caliper body Rear piston is threaded and requires a special tool to screw piston into caliper body Tool not expensive and available at Sears or auto parts
if you have a brake shoe on rear brakes, you do not have rear disk brakes pads go on disks.shoes go on drum brakes
If you front brakes rattle, it is usually caused by a a stuck puck or piston in your brake assembly. When this happens, the piston does not fully retract at times causing you brake pad or pads to wear excessibly and when the piston finally retracts fully and does not keep constant pressure on your pads you get a rattle. I had this problem on my F-150 and the brake guy solved this by installing steel pucks and lube.
diameter
Heres what to do there are two screws on the top and bottom of the brake caliber you unscrew the srews and take the brake caliber off, then use a c-clap to push the plunger like thing back then replace the brakes and rescrew the screws. when all of that is done then you must press on the brake pad until hard so the new brakes ccan realigne themselfs.
how to remove back brakes on a 2002 Chevy surban