There is not enough information in your question. A cylinder piston you do not compress, you compress the rings in the piston. There are pistons in the brake system. There is no way of knowing the problem without being more specific.
I'm assuming you mean the caliper piston. If it can't be compressed, replace the caliper.
The rear piston has to be turned in, it won't just push in, they make a tool at the parts store that makes it easier, if you have tried turning it in and it won't go you will have to replace the caliper as it's bad.
it dosent just push back in anymore , u have to turn it , it screws in.
you cant
BECAUSE in case of stone the molecules are closly packed and they have no vacant space between them and they have not the ability to close to each other so when we compress a stone we cant compress it
Because a solid allready has a form that is why you cant compress it
No, it cant.
Take your old one directly to a rebuilder and get yours rebuilt
You cant, it needs a 'C' clamp.
Cant Its the computer
You cant find replacement parts for that bike, but if its for a piston... a honda CR 125 dirt bike piston will help and fit, heights and dimensions are to the notch the exact same...
You cant
there are 153 blocks and the piston cant pull Obsidian, Bedrock, Note Block, Chest, Furnace, Dispenser, Monster Spawner, and an already extended Piston. (However, when Pumpkins, Jack'o'lanterns, Torches, Cacti, Cobwebs or Melons are pulled, they break.) 145 blocks (or 139).