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You need to do a "major" adjustment on your rockwell brakes. They will work with the stock mc, but they have to be adjusted correctly.
I describe the adjustment procedure here:
http://www.m715zone.com/vb/showthread.php?t=10685
All that being said. I think you would be better off now, in the long run and for safety to put a bigger dual circuit master on the truck.
ok will do a "major" adjustement .... and changed my master ... since i will be towing 7500 pounds with the 715 . safety comes first.
NOw ... installed the master and tomorrow will do a major job with the feeler gauge. I try this afternoon but still got a spongy feeling on thae brake ... i have bleed them at least 20 times to be sure ... but the truck is not really braking .. i cannnot lock any wheels on the gravel at 20 mph ... i'm sure i must be able to .. !!!