I have had the "hoses collapsed" front dragging. It is possible with stainless also I think if the liner collapses... but not likely both at once.

I am not an expert on prop valves... but generally seems like they are a potential problem and limited benefit. The fronts usually run fine on a simple "T" and rears, adjustable valve only if needed.

I you bring her home with front brakes tight, try cracking a front bleeder one at a time. Does that loosen one wheel? Or both?