This link has the manual on how to change the brake pads.
http://files.mytouareg.info/autoindex.php
Use a large C- clamp to depress the piston enough to remove the caliper.
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.
Most likely 3/8 Allen for caliper this truck.
you have to take off your rim and tire, and your caliper.
It can be a sticky caliper or you need to change brake pads.
you will need a c clamp to depress the caliper after pulling the brakes, first take the tire off second there are usually 2 bolts to the caliper remove the bolts third you will find the pads once you remove the caliper they will just snap in then you will need a flat surface to push agaisnt the caliper to depress it i usually use the old pad when you have finished you will need to pump your brakes in the car until the are hard.
How do you compress the rear break caliper, pistons on a 2002 Sierra ?
Normally 2 but it depends on the make vehicle.
true you do not need to remove the caliper to change the brakes. how evever they are removeable. you should be able to loosen one bolt on the caliper and flip it up to remove the pads.
Jack up the car. Take off your tire. Find the bolt on the back of the caliper and take it off. This should release the caliper, pull the caliper off the disc. Now you should be able to take the pad out. Replace the pad. You'll need a special tool to reset the caliper. As the brakes wear down, the caliper gets tighter so the brakes still work. I'm not sure exactly what its called, but you can borrow one from auto zone. Follow the instructions that come with it to reset the caliper. Slide the caliper back over the disc. If it doesn't go on, you need to reset the caliper more. Put the relese bolt back in. Put your tire back on. Drive slowly and test the brakes. Hope that helps at least a little bit.
yes, when you took the line off, you let air into it. so you will have to bleed them.
Changing the caliper is an extension to the changing the brakes procedure.The 'extension' is to disconnect the brake line/hose from the caliper.Next extra step is to bleed the brakes - since the new caliper is going to be full of air when you first hook it up.See "Related Questions" below for more extensive coverage of the procedures...