Brake Junction Block
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 Dodge Intrepid, 2004 Chrysler Intrepid, 2004 Chrysler Concorde, 2004 Chrysler 300M, and 2003 Dodge Intrepid. However, it is still accessible from the selected car via links, so may be relevant.
The junction block distributes the brake fluid coming from the master cylinder primary and secondary ports to the four brake tubes leading to the brakes. Since the junction block mounts in the same location as the ABS Integrated Control Unit (ICU), it allows for the common use of brake tubes on the vehicle whether it is equipped with or without ABS.
Later applications of the junction block include two proportioning valves. Placed in the fluid flow passages leading to the rear brake tube ports, they balance front-to-rear braking.