You are correct. The brake rotor on the Goodyear wheels I'm familiar
with floats inside the wheel. It's kept from rotating by the little
metal blocks (keys), and kept centered by some springs that go between
the blocks. The caliper then keeps the disk from sliding in or out
on the axle, since the disk is captured between the two pads.
(Actually, it does slide in response to pad actuation, but the
amount of movement is minute.) Basically, its sort of the reverse
of an automotive floating caliper. In the Goodyear, the caliper is
fixed, and the disk floats.

There are many variations of these wheels and brakes, and the disks,
calipers, little blocks, springs, and retainers are all more or less
unique to the specific version you have.

Never looked at the Matco calipers, so I'm not sure if they will
be easy to adapt or not.

Be advised, some people go livid at the mention of Goodyear brakes,
because in the original application, if the pad wears too thin, it
can slip out of its recess and jam the disk. This results in an
instant locked brake, with no way to release, which can be really
exciting, especially at touchdown in a taildragger. DAMHIKT.
Also, if the spring clips, retainers, and/or metal blocks break or
pop out, you can experience the same thing. Lots of folks have
converted away from Goodyears for that reason. Whether or not
that motivated the company to stop making the things, I don't
know. Properly maintained, it seems a useful system for a light
plane like a Cub, Champ, Luscombe or similar.

Hope it helps,
Henry Bibb

In article ,
says...
I bought a set of Goodyear wheels at the Mid-Atlantic Flyin held in
Lumberton, NC last Saturday. They were fairly dirty, but only cost $10
and cleaned up real nice. I elected not to carry home the brake
calipers, they as it would be too hard to make them fit my installation.
Figured someone else could make better use of them.

I've done some research, and the Matco 600 series of triple-piston
calipers look like they will fit right in, with a nice 1/8" clearance
all the way around.

My question is, "How does the brake rotor attach to the wheel in the
Goodyears?" It looks like the rotor float freely on some metal blocks
and held in place by the calipers. Is this correct? Or is there some
way to lock the rotor in place?