Hi Wade,
The fluid enters the rear of the piston bore cavity via the external steel tubing and a passage that is internal to the caliper (inboard caliper half). Once in the bore cavity, the fluid travels through another passage that is in the side wall of the piston bore cavity. That passage goes through both halves of the caliper (via internal passages) to the rear of the piston cavity in the other half of the caliper (outboard caliper half). There are separate passages for each pair of pistons that are joined together via the external steel tubing and the external tee.
John
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