WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Hydraulic Control Unit Mounting
Courtesy of CHRYSLER GROUP, LLC
The Antilock Brake Module (ABM) (2) is mounted to the Hydraulic Control Unit (HCU) (3) and operates the ABS system.