Sounds like we may be onto the problem. When you set up the linkage distance (brakes torqued to 80 and the two fixtures set up at either end) the clevise at the steering box should just be engaging with the wheel at 90.
Remember that afterwards you will be backing the 4 notches, so once all is said and done, the actual locking of the brakes will occur well beyond the 90° point. At 90 to 95 degrees, they should just be starting to engage. Full lockup by the book is at 165°, although on my carrier it is a bit beyond that. It may be that my modern linings are still setting in.
From the Cdn manual:
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During the 90° swing of the wheel no action should occur in brake linkage.....
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