anyone had ever issues with prop.valve

Is the dragging when the brakes are applied? Could headers be heating right side hose as to render the right brake ineffective. Did car sit maybe, proportioning valve stuck. Not sure but believe it only propotions front to rear. I has a similar problem and slammed the brakes and observed the skid marks.One wasn't locking up like other three. Changed hose to caliper and it corrected it. Hose was weak and swelling when applied.