You don't. I just learned that it spins in. You either buy a tool that fits the v-grooves on the piston face and spin away - or, like I'm doing at ten at night; trying to spin the thing in using needle-nosed pliers.
Yes 2000 Jetta GL does have front brake pad sensors.
See sources and related links below for 2000 VW Volkswagen Jetta light bulb lamp part numbers.
because the brake switch is probably broken
You can find an inexpensive tool at your local auto parts for this.
Bent valves and possile piston and head damage for starters
If the piston is just a solid or hollow cylinder, you can use a pair of big channel locks and an old brake pad to squeeze it back in, if the piston has little cut outs in it you will need to rent a tool that twists the piston back in to place, like a bolt.
Replace thermostat on 2000 vw jetta
Hand brake warning light
If rear brake caliper is used for emergency brakes also - piston is threaded and requires a special tool (not expensive available at Sears or auto parts) to screw into caliper housing
yes
Remove caliper mounting bolts Slide caliper off rotor Use a "C" clamp to fully retract piston into caliper body If parking brake is used on this caliper piston is threaded and a special tool (not expensive) is required to thread piston into caliper body
You will need a special tool to compress the rear brake piston, other than that, regular tools that any car handyman has.