I can't compress front caliper back in

The problem’s with the rubber gasket around the caliper piston; it’s pushed out somehow?

Did you maybe have the caliper off without disconnecting battery, had the system pressurize?

 

Unless your familiar with rebuilding brake calibers and have done it several times without killing someone - go get a replacement assembly. If you scar the piston or damage the seal while forcing it back in - you can send your car into a spin.
Now that the warnings are out of the way - did you disconnect the battery and remove the brake fluid reservoir cap?

Hope this helps..

 

1. disconnect the battery and remove the reservoir cap.
2. realign the piston and seals - use a C-clamp to push back the piston. You should be able to hand-crank the piston back. If you need to use any sort or lever on the C-clamp - something is hung-up. Replace the entire caliper assembly.

Hope this helps

 

If you're talking about the piston to housing rubber seal you realize that slips onto the lip of the piston and then squeezes in to the circled area in the remainder of the caliper and it generally just pushes in very nicely You shouldn't have to beat on it or any of that stuff and of course like most people are saying a remanned caliper online is 50 bucks and in store at advance Auto is 69 if you bring your old one just leave it and take the new one there's always that I've put a buttload of the seals in all kinds of these cars The Prius isn't special other than you need to make sure the 12 volt is disconnected or the key fob is away from the car and no one's going to get in the car and step on the pedal or play games then everything will stay copesthetic while you remove the caliper have the other one sitting right there screw it on open the zerk on the new caliper you just screwed on Wait till fluid bubbles up out of it close the zerk mount the caliper And you really should not have to bleed anything If you're worried about that before you touch anything after you mount the caliper have the pads in have everything together crack the zerk again and watch for the steady rhythmic drip if any air comes it'll look like a mouth is blowing a chewing gum bubble and pop and then the drips will go back to the same speed they were close the zerk and I'll get in the car and step on the pedal see if it feels like it normally does with the car off stepping on the pedal start the car move it a little and see what you got You're probably good to go.

 

Are you sure you have the correct kit for that caliper?
You said it was misaligned.
If you have the correct kit, you'll need to set the piston with seal in place.
Make sure it's evenly positions, then press on it. You can use a PLASTIC tool, like used
for taking about iPhones, iPad, etc., and press the seal into the cylinder. Make sure you applied
brake fluid around the cylinder wall and lip, and also on the piston and seal.

The plastic is less likely to damage the seal, just take your time and go easy.
You can also apply a clamp, as stated above, but clamp just enough to hold the piston in place.
Once you have the seal in the cylinder, you can slowly tighten the clamp. You can also tap the caliper
with a plastic hammer or the wooded handle of a metal hammer lightly, this will sometime rattle the
seal so it will equal out making it easier to press in with the clamp.

 

Also, when pushing in the front caliper pistons, If you're using something like a C-clamp, put some sort of shim, say wood, that covers the full face of the piston: it's plastic, can be cracked by a point load.

 

Sorry, My bad - I use one of the old brake pads to redistribute the load across the piston.
I've done it so many times, I don't even think about it anymore.....