Car was originally disc/drum, master is for disk drum, 1 1/32 bore.

Prop valve was/is completely removed right now, still can't look up either end.

Lines are right, closest to booster to front, farthest to rear. Front lines replaced with stainless braided, rear rubber line is about 7 years old.

Rapid Robert - I'll try to get those plugs, great idea to isolate the problem.