[JRTJH]

There's one wire from the brake controller through the 7 pin connector to the one wire in the trailer wiring harness. That one wire goes back to the front axle. At the axles it splits to two wires, one to the front axle and one to the rear axle. At the roadside wheel (on most trailers), it branches through the axle shaft to the other wheel on each axle. Nowhere is there any capacity for the brake controller to "control independent braking action" to any one wheel. All are provided the same "one wire current" when the brake controller (either OEM or aftermarket) sends the signal to stop the trailer.

Any repeated malfunction of the braking system on any specific wheel would probably be a mechanical issue, not a electrical issue (assuming all 4 wheels are correctly connected and the magnets are operating properly). All 4 wheels receive the same electrical current.