https://www.youtube.com/watch?v=n1NvtUwfRJc
Generally, it is not a good idea to replace hydraulic parts on one side only. It may be OK but internally the older caliper has less internal resistance than the new one which leads to uneven brake force. You may feel this with very light touch to the brake.
I am working on the brakes of a 08 Hyundai Sonata. One thing I noticed is that the areas where the pads are held on the brackets are corroding in significant ways. There is more corrosion than the wire brush can remove. I chipped away a layer of that stuff and used a file to get to solid metal. I put anti-seize stuff on these surfaces before adding the shims. I also took out the slides, cleaned them, cleaned out the bore for them and greased them up with anti-seize.
I suggest you bleed the system again even if you have done it before. In fact I would completely flush the system.
You replaced the master cylinder. Look at this video to see if you have done all the steps.
https://youtu.be/trotrlIG2sk
Which year and how many miles on your Vibe?