An anti-lock brake system module for a trailer or dolly, including a module panel having a front side and a back side facing in an opposite direction to the front side, a plurality of anti-lock brake system components, at least a portion of the components attached to the front side of the module panel and at least a portion of the components attached to the back side of the module panel, the plurality of anti-lock brake system components including an anti-lock brake valve and an electronic control unit, and a mounting element for removably connecting the module panel to a mounting location, such as an I-beam, of the trailer or dolly.