Grand Caravan FWD V6-3.3L VIN 3 Flex Fuel (2002)
Hydraulic System Junction Block: Description and Operation
JUNCTION BLOCK
DESCRIPTION - NON-ABS JUNCTION BLOCK
A junction block is used on vehicles that are not equipped with Antilock Brakes (ABS). The junction block mounts in the same location as the
Integrated Control Unit (ICU) does on vehicles equipped with ABS. This allows for use of the same brake tube configuration on all vehicles. The
junction block is located on the driver's side of the front suspension cradle/crossmember below the master cylinder.
It has six threaded ports to which the brake tubes connect. Two are for the primary and secondary brake tubes coming from the master cylinder. The
remaining four are for the chassis brake tubes going to each brake assembly.
OPERATION - NON-ABS JUNCTION BLOCK
The junction block distributes the brake fluid coming from the master cylinder primary and secondary ports to the four chassis brake tubes leading to
the brakes at each wheel. 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 going to the brakes whether the vehicle is equipped with or without ABS.
NOTE: Although the brake tubes coming from the master cylinder to the junction block or ABS ICU may appear to be the same, they are not. They
are unique to each brake system application.
