Terry,
I run my 450 at "9" and am satisfied with the results. Had it on '10' for a long time, also. Either seems to work fine for me, but I have the drum brakes only. Using either setting will bring the truck to a halt with trailer brakes only, particularly at low speeds.
At 77000 miles on the truck, still have plenty of front brake pads left, and rotors are ok, so combo seems to work well.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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