you need to turn the caliper piston clockwise to get it to go in..you may be able to rent a tool to do this at auto zone and most parts stores...but,you can do this with a large set of pliers
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Volkswagen Golf/Jetta/Cabriole 1990-1999
NOTE Parking brake adjustment is only necessary after replacing brake pads or other brake components. If the parking brake does not hold the vehicle, the rear calipers and brake pads must be removed for inspection.
Fig. Once the caliper is supported, slide the pads out of the rotor
Fig. Lube the guide bolts with a synthetic caliper grease
Fig. Always inspect the anti rattle clips for damage
Some brake pads contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.
The brake pad wear limit is 0.080 inch (2mm). If the pads show signs of heat cracks or if they are worn unevenly, check the caliper for a sticking piston or guides. Check the caliper for signs of fluid leakage or damage to the dust seal. Check the rotor for signs of heat cracks or discoloration. Minimum allowed thickness of solid brake rotors is 0.393 inches (10mm). Maximum allowed run-out is 0.002 inch (0.06mm).