The Matco manual suggests unbolting the brake disc to assemble the brakes, my preference is to not touch the disc which can be accomplished with the procedure below.
The trick is to use two 5/16-24 x 4 inch long bolts and two 5/16-24 x 3.5 inch long bolts. With the added length it is easy to position the inside brake pad. All told it takes about one hour per wheel (removal, cleaning, greasing bearings, and reassembly).
Remove the cotter pin and the axle bolt
Spray the assembly with brake cleaner to remove grease and brake pad dust
Spray all components with brake cleaner, including the rim and brake disc
Tighten ALL of the bolts AND the guide pins on the brake caliper
Grease the wheel bearings and slide the first bearing on to the axle
Insert the inside brake pads, slide the wheel on the axles, install the second bearing, the outer washer, and loosely attached the axle nut
Clean with acetone or MEK the pad spacers, holes in the outside brake pad, and the slide pins on the caliper
Stock Matco bolt compared to the 4" bolt
Attach the 4" bolts in the two outer holes (the caliper will NOT be in contact with the plane yet)
Position the caliper and place the slide pins into the brake plate
Insert the machined spacer and attach the two 3.5" bolts in the middle holes
Tighten one of the middle bolts to pull the assembly together
One at a time, replace the 3.5" and 4.0" bolts with the Matco bolts (and Norloc washers)
Tighten the bolts to 120 inch/pounds
Tighten the axle nut until the wheel can be turned without the bearings moving
Align the hole in the axle nut with the hole in the axle using a piece of safety wire
Insert the cotter pin and fold over the legs and then clean the disc and brake pads a final time with brake cleaner
Oh and FYI, this year I found three of the four slide pins had become loose…
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