Which of the following do electric trailer brakes use to apply force to the brake shoes?

Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Electric trailer brakes generate braking force with an electromagnet. When the brake controller sends current, the energized coil creates a magnetic field that pulls the brake shoe (or a lever linked to it) against the drum, pressing the shoes outward to slow the wheel. When power is removed, return springs release the shoes. This method uses magnetic attraction rather than hydraulic fluid, compressed air, or a direct mechanical linkage, which is why electromagnets are the correct choice.