Usually you can't ever see a collapsed brake hose. The inner layer collapses because fluid leaks between the layers and squeezes the inner. The result is pressure staying in the caliper when you let off the petal. The best way I know to test for a collapsed hose is when the vehicle has just been driven. Let it cool for 10 min, (don't want to burn your fingers) open the bleeder on that caliper for just a split second and close it. If fluid shoots out fast then stops. It is a collapsed hose, if it trickles out, it is normal, if it does not come out at all, possibly a stuck caliper piston. <img src="/forums/images/graemlins/kewl.gif" alt="" /> This is not 100% accurate, 95% maybe.