There is likely a crack in the engine block.
Virtually, it cannot.
It willl overheat when it gets low on coolant.
No
leaking wheel cylinder
It could, if enough coolant leaks into the cylinder to hydraulicaly lock it.
Leaking heater core
Your brake master cylinder may be leaking. Have it checked by a technician.
Engine coolant leaking into cylinder. Possible bad head gasket.
Don't drive and take it straight to a garage 'cause it will empty your brake cylinder.
cracked head, leaking head gasket
It is either leaking down the inside of your firewall under the dash (master cylinder) or leaking just enough inside the trasnmission bell housing to not puddle and be thrown around by the clutch spinning (slave cylinder).
Heater core may be leaking Door seal? Windshield seal?