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drive with it off and have the parking brake inspected for damage.
short answer......no there will be nothing to prevent the caliper piston from coming out of the body. if that happens you will lose your brake fluid and brake function. you will kill yourself or someone else.
You need a special brake piston tool to do this. Here is a link that shows what this tool looks like: http://www.lislecorp.com/tool_detail.cfm?detail=416 Basically, you put this on the end of a 3/8 inch drive, then use the side of the tool where the pins match your brake piston. Engage the pins from the tools into the piston slots, press in and turn clockwise. It will take a lot of turns to move it back in the bore.
You will need to remove the cover from the brake fluid reservoir on the master cylinder. Then you'll need to use what is known as a C-clamp to drive the piston back in so you can replace the brake pads. Be sure you bleed the brake system and return the brake fluid reservoir cover.
If you pulled the piston all the way out,make sure you lube the cylinder bore with brake fluid, not oil! Petroleum products will degrade some parts of the brake system.Twist the piston as you insert it, that way you will stand less of a chance of getting it cocked in the bore. The rubber boot or dust cover may get in the way.Bottom out the piston in the bore so it is easier to put the brake shoes on and, having done that and before you drive away, pump the brake pedal several times to fill the cylinder with brake fluid and seat the brake shoe against the rotor.If you are putting on new brake shoes and just need to push the piston back in the bore, the best way is to use a 4 inch "C" clamp - about 10 buck at an auto parts store
You should not drive the car until the brakes are repaired.
drive at about 30 mph then gun it to about 75 adn repeat that about 7 to 8 times and they should be seated properly.
If you don't mind making it worse, sure. Otherwise, absolutely not.
The piston is inside an engine, under the valve cover, under cylinder head. it is the piece that transfers the explosive energy into rotating motion along with the connecting rods and the crank shaft. It all however has to go through the whole drive train to get to the wheels: the the transmission,the drive shaft, the differential, and so forth. There is also a piston inside a typical brake caliper, sometimes more than one.
once you separate thecaliper from the brake pad, look at the piston, it should have two small indentations on the face. the piston screws in and out. you will need a tool to do this. this tool can be purchased at your local auto parts store. it is a cube shaped device with a square drive. insert the tool into the inserts and rottate the piston counter-clockwise until the piston bottoms out in the caliper.note- the tool you can purchase is usually made of aluminum or pot metal meaning you might get threeor four good uses out of it.
A c-clamp will work just fine. If it takes a lot of pressure to retract the piston the caliper may need replacement or rebuilding.
Don't drive and take it straight to a garage 'cause it will empty your brake cylinder.