2017 Tundra SR5 rear driver side brake is leaking

it seems to be coming from whatever that rubber boot or seal is. Break was dragging for a little while then i stopped at walmart on the way home and when i left i had almost no break pressure. Pulled over and still had a lot of fluid but went to look underneath and this is what i can see. If anyone knows anything please inform me.

 

I usually like to rebuild calipers if I can, but if its sticking and leaking it's probably just easier to replace the whole caliper and get it over with. Good luck.

 

Bruh, this reminds me of the time the rear passenger rotor cracked and it took the brake piston with it. I still have it meaning to rebuild the caliper. I kept hearing clapping but couldn't figure it out from where.. I did drive home from work with the manual mode since my brakes were gone, but once I pulled the wheel, I could see the backside brake pad sitting on the bottom of the rotor.
I replaced it with an Autozone unit about 6 years ago and it seized last year, so I got a brand new one from them for free... Nothing beats OEM, but at the time I didn't have the funds for them, but so far so good, I guess.

 

Replace it and the other side.