I literally just changed/ flushed with Motul 600 brake fluid. All four corners and that’s it. Standard brake flush sequence - RR, LR, RF, LF. Lowered the truck and parking brake fault, service trac fault, hill assist fault, service brake.
I went back in a reflushed RR and LR. Oddly, RR wouldn’t flush, went to LR which flushed, then back to RR and it flushed. I lowered the truck and parking brake fault. It sounds like either the e-brake isn’t properly disengaging/ engaging.
This is what the fluid looked like. I assume it’s associated with my previous seized caliper issue, which was also RR.