Hello ht.
I recently just filled up my brake fluid not knowing it was completely empty.
But why was it empty? Leak? Leaking from where tho? Possible places? Can brake fluid burn out?

 

As brakes wear the caliper pistons and/or wheel cylinders move out so brake fluid is transferred from the master cylinder. It could be that over the life of brake pads you could empty the master cylinder. would also depend on how full the MC was to start.

 

its probably the brake proportional valve leaking. Its right on firewall behind the intake manifold. You will see brake lines coming out of it. Mine is leaking too, and I'm replacing it.

 

I'll have to check that out