How to change rear brake pads - 2009 Volkswagen Routan

SOURCE: CHANGING REAR BRAKE PADS

the best thing you can do is go to an autoparts store and purchase a haynes repair manual for your car. cost about $18, but will show you everything you need to know, with pictures.

SOURCE: 2005 malibu rear disk brakes

Actually, you need a "cube tool" and need to twist the caliper/piston head clockwise in order to compress it. A C-clamp will not work.

SOURCE: how to change rear brake pads

Raise the rear of the vehicle and make sure it is securely supported. Remove the rear wheel Remove the brake hose (A) from the suspension arm by removing the brake hose clip (B).Thoroughly clean the outside of the caliper to prevent dust and dirt from entering inside.Support the caliper with a piece of wire so that it does not hang from the brake se.
Remove the two guide rods (C) and caliper (D) from the bracket. Remove the pad shim (A) and brake pads (B).

Remove the pad retainers.
Clean the caliper thoroughly; remove any rust, and check for grooves and cracks. Check the brake disc for damage and cracks. Install the pad retainers. Check the foreign material at the pad shim (A) and the back of the pads (B). Contaminated brake discs or pads reduce stopping ability. Keep grease off the discs and pads.
Install the brake pads (B) and pad shim (A) on the caliper bracket. Install the inner pad with its wear indicator (C) facing down ward. If you are reusing the pads, always reinstall the brake pads in their original positions to prevent a momentary loss of braking efficiency. Rotate the caliper piston (A) clockwise into the cylinder, the align the cutout (B) in the piston with the tab (C) on the inner pad by turning the piston back. Lubricate the boot with rubber grease to avoid twisting the piston boot. If the piston boot is twisted, back it out so it is positioned properly.
Install the brake caliper (D). Install and torque the guide rods (E) to proper specification. Install the brake hose (F) onto the suspension arm with the brake hose clip (G). After installation, check for leaks at hose and line joints and connections, and retighten if necessary. Depress the brake pedal several times to make sure the brakes work, then test-drive. Engagement of the brake may require a greater pedal stroke immediately after the brake pads have been replaced as a set. Several applications of the brake pedal will restore the normal pedal stroke.

SOURCE: rear brake cylinders are stuck, can not push them in

I'm not sure about your vehicle but some models must be turned as they go back.

SOURCE: Jeep Commander Rear Brake Pad Installation

Per Chilton Auto repair manual:

Removal & Installation

1. Raise and safely support the vehicle.
   
2. Remove the rear wheel.
   
3. Siphon a small amount of brake fluid from the master cylinder reservoir.
   
4. Insert a small prybar through the caliper opening and pry the caliper cover (using the outboard brake pad) to bottom the piston in the caliper bore.
   
5. Remove the caliper slide bolts.
   
6. Remove the caliper from the anchor.
   
   WARNING Support the brake caliper with mechanics wire. Do not let the caliper hang by the brake hose.
   
7. Remove the brake pads from the caliper.
   

1. Install the brake pads onto the caliper.
   
2. Lubricate the slide pin bolts with grease provided with the brake pads, or suitable silicon grease equivalent.
   
3. Install the caliper on the anchor and tighten the slide pin bolts to 18 ft. lbs. (25 Nm).
   
4. Install the rear wheel.
   
5. Lower the vehicle.
   
6. Pump the brake pedal several times until a firm pedal is obtained in order to properly seat the pads.
   
7. Refill the brake fluid reservoir to the proper level.