I found trouble shooting tips on Matco's site. I used their suggestion to sand the pad surfaces with 220 grit. I used a rifle bore brass brush to clean the insides of the tubes that allow the pads to move freely and polished the outside of same. Upon re-assembly I found no additional braking power. Maybe just the fact that I have 22" dia tundra tires gives the plane too big of a lever for these brakes designed so long ago. I'm going with the Fred Flintstone method of dragging my feet!