Thanks. The old drum rear worked, but was never consistent, if you forded a creek and it got wet it didn't work hardly, and was never very strong. I like the disc mostly for steep downhills in tight woods when you can't use too much front brake, you can count on it to always be there and work.
I have considered buying a new Gasgas 300 lately, and retiring the KDX ( I could never sell it), but everytime I go ride it I just can't say enough good things about the bike. It does just what I want and handles like it's a part of you, and over the 27 years I have owned it it's never let me down once.