2011 Nissan Murano SV.  100k miles.

I had consistent MAF sensor codes tripping and kept cleaning it, but the code kept returning.

After a few months, the AC went out which I was going to wait to repair.

Then, without brake noise warnings, the brakes began grinding.

I took the Murano to a well rated shop (that I had not used - I moved to a new location).  They replaced the MAF sensor, AC, brakes, and rotors.

This is not our daily car, but since the repairs, there is a vibration/slight grinding felt in the pedals (no vibration in the wheel) and a bit in the floorboard.  I think, but I'm not sure, that the mpg has went down too.  Were the brakes installed improperly?

Finally, the AC doesn't seem to cool as well as before.  I have to keep it at 60 (lowest setting) to get good cooling.

Any thoughts about what might be wrong, or maybe I'm just being paranoid (I assure you it is a different feeling car now though).  Maybe I should make an appointment with Scotty, since I'm about an hour from Clarksville, TN.

Thanks in advance.