The optional brake kit provides all you'll need to change to a disc/drum system. Notice, the proportioning valve goes in the line to the rear drums. Replumb the brake lines by plugging the rear of the original "T". The new line to the rear goes from the rear port of the m/c through the proportioning valve and reconnects into the old rear brake line.
Mount the proportioning valve on inner fender panel, using a spacer.
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