Rear disc conversion and master cylinder

[homemade87]

Update, I put the master from the 2001 silverado on ( 13-2881) and I did not see much if any improvement . The peddle has a soft spot at the top and when pressing down harder it comes to a hard spot you have to bare down on to get any additional braking . The peddle has at least a 1" travel before it starts to brake. I had just did a 4 corner vacuum bleed to eliminate air.

I understand my 82 had a quick take up master on it to accommodate the front quick take up calipers. I am not real familiar with this. I just wonder if the 1" travel could be from this. Does anyone now if there is a reg caliper that would fit my 82 that's not quick take up. Does anyone know more about this than I do. Any opinions on this would be helpful .