Automotive Service Excellence (ASE) Brakes Certification Practice Exam 2025 - Free ASE Brakes Practice Questions and Study Guide

An electric braking system is commonly used to activate drum-type friction brakes on a trailer, particularly when the trailer has a gross weight exceeding specific limits.

Electric braking systems offer several advantages, including more controlled braking, which enhances safety, especially for heavy trailers. These systems operate by sending an electric current from the towing vehicle to the trailer, activating the brake magnets within the drum brakes. This allows for responsive braking that can be adjusted according to the driver's input via a brake controller installed in the towing vehicle.

In contrast, a surge brake system relies on the momentum of the trailer and the action of hydraulic pressure, making it less suitable for heavy trailers. While both surge brakes and electric braking systems are utilized in trailer applications, the electric braking system is specifically noted for its effectiveness in managing the braking forces required for heavier loads. Thus, focusing on the electric braking system highlights its suitability for heavy trailers and its operational efficiency compared to other systems.