Where does the brake fluid go?

In the brake fluid reservoir, if you can't find it, look in your book, or follow the fluid lines from underneath your car to the reservoir. A further clue is that the brake pedal arm and brake pedal, the one that you put your foot on to operate the brakes, is connected directly to the brake fluid reseviour, so look at the firewall amd see where the pedal arm comes into the engine compartment, thru the firewall.