wait... on my 32 the front rack is completely seperate to the hicas rack, there is no plumbing between them.
on my friends CA silvia there is a connection that is bolted to the rack, but no fluid is mixed here.
i found this out when i locked the hicas on both cars so both definitely had hicas.
hicas cars have a pump that has 2 outlets and then the resevoir has 2 inlets, so the front rack and the hicas rack are completely seperate all the time.
i dont understand how a non hicas rack can be different then, cos i've definitely never seen any connections on the rack for hicas. rack has 2 connection, 1 in, 1 out