Rear disk conversion issue

Yes, check spacing first. But If it is okay check to see if you had a sticky caliper or a bad intermediate brake hose, too. The parts may be new or near new, but my professional commission mechanic friends are getting overwhelmed by the run of bad over the counter parts right now. Start at the problem and work your way forward. And if you didn’t build your own master cylinder, it may be a good idea to double check the master that it doesn’t have a residual pressure valve if you haven’t already.