Those appear to be your original Goodyear 3 inch wheels (and brakes) with Lamb adapters. The adapters increase the hub size to 4 inches allowing the use of 800X4 Cub tires.

The alternating brake discs (usually bronze and steel) work like a clutch. The rotating discs are keyed to the wheel hub. The stationary discs are keyed to the fixed landing gear brake bracket.

Try cleaning, inspecting and adjusting them to see how well they work.

You’ll need to add master cylinders if you decide to upgrade to Groves.

Best,

HT