Brakes are not linked on Royal Star Ventures.
May be a collapsed line somewhere. Start at the outlet of the master cylinder break that connection and press on the pedal, if fluid freely flows, reconnect and work your way down the line until you find a point where the flow is diminished, if you get to the bleeder valve on the caliper and do not find an issue, maybe the calipers are stuck or dirty to the point they will not move freely.