What type of brake fluid does the 2015 ford edge use?

Dot 3 and Dot 4 fluids are compatible with the 2015 Ford Edge. First of all, Your brakes don't work without brake fluid. It's a hydraulic system. Brake pressure pushes fluid down to Your brakes, pushing the pads onto the rotor (these are called disc brakes because the rotor looks like a disc). The rotors are attached to the wheel hubs, and spin as the wheel turns. More pressure causes the car to slow down. No fluid, no pressure. You have an emergency brake (also known as a parking brake), but it's often too weak to stop the car in an emergency. So if You or Your mechanic spot a brake fluid leak, it's a big deal. You should fix it immediately, and You should not drive it until it is fixed.