[MazdaX]

Hmm frozen brake fluid means you need more anti freeze in it...=)

Seems like someone didn't use the right fluid on last fill up. I've been in one of the most extreme places where -60 comes and goes on a whim and never seen brake fluid freeze :/

I would suggest draining , replace the seals ( master / slave ) as the freezing water or whatever was jammed in there may have ruined them. Easy fix shouldn't take more than an hour to do and you should regain pressure. Then again , when I had my tranny built I thought it was weird that the clutch pedal was softer to press in than the gas pedal but I get perfect shifts everytime.