If you have 3/16 line from the master to the calipers with new hoses i'm stumped, we have used the under the floor power brake kitsin either the disc/drum or disc/disc from BROTHERS along with a FATMANS MII with no problems in my customers trucks, but we rebuild the rear brakes including wheel cylinders/calipers and all new lines when we do them. I don't know about the new yorker mas cyl but I have the REYBESTOS tech tollfree # and can give you my dealer pin# in an email.
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Rest in Peace Ed. Thanks for all the good times.
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