r/SN95STANGS

Hello goobers, looking to see if anyone in here could have had a similar issue before. So while I was driving my brake pedal randomly got hard, to the point where I actually had to try to get it to move. It almost felt like it was stuck, or binding. Once I got it pressed, the car drove and brakes normal again. This only happened once in the morning, and once at night so it’s relatively intermittent. Curious to see what people think, maybe a power steering/hyrdroboost concern? Car is a 97 GT 4.6 2v