Today we are going to take a look at the Hayes/AL-KO 12.25 inch by 3.5 inch passenger side electric brake assembly for 9,000 pound to 12,000 pound axles. Electric brakes are easier to install. They offer more user control than hydraulic brakes. They will require only an electric brake controller, there is no actuator hydraulic lines necessary. This is a 12.25 inch by 3.5 inch passenger side… see more >