Q: Brake rotors

Hello I'm a danzel in distress, I bought a used 2005 chevy equinox with 140,000 miles on it less than 2 weeks ago from a fly by night dealer, no warranty wit the truck. I noticed yesterday while driving a burning oil smell n every time I went to break it felt hard n wud shake. Luckily my uncle is pretty handy wit cars the min I pulled up he smelt it n knew what it was. He took the hose n poured water on the driver side wheel n smoke just began coming out like crazy, so he figured it was the caliber. I bought a new caliber, he put it on n instantly I could feel the difference. Breaking was so much smoother, the shaking stopped n the smell went away. Up until this afternoon! The same thing is happening on the the same side n it's a brand new caliper. The smell, the harsh shaking n I can actually see the waves of heat coming off that front right wheel. As my uncle changed the caliper he said the breaks where descent prob should change them in 2 months. So it's not the breaks, any advice

My car has 141 miles.
My car has an automatic transmission.