New master brake cylinder/brake booster

My 2018 off road has a hydraulic master brake cylinder/brake booster and it was recently changed out because of a small leak. I noticed that the brake seems firmer than before and the 'buzz' feeling is more apparent than before (i'm aware some buzz is normal). I also noticed the buzz for a few seconds upon start up this morning, even with my foot off the brake pedal (i dont recall if this was the case prior).

Any concerns? Will be contacting toyota monday but wanted some input.

 

Thankfully no buzz in the brakes on my truck, hopefully they figure out whatever is going on with your truck.

 

I wouldn't be concerned if everything functions properly. They definitely seem to vary in NVH unit to unit and batch to batch.

 

Interesting, i assumed all 3rd gen off road models had the hydraulic brake system which would have the buzz feeling