Welcome to the forum zipperdog! You can look up exploded diagrams for John Deere here:
John Deere - Parts Catalog
Looks like there might have been two types of brakes used on those. One being a drum style and the other being a wet disc type. Below are the images I found at the link above of them. You can also find images there of the clutch and brake pedal linkages.
The "wet" style is the first photo:
The drum style below:
John Deere - Parts Catalog
Looks like there might have been two types of brakes used on those. One being a drum style and the other being a wet disc type. Below are the images I found at the link above of them. You can also find images there of the clutch and brake pedal linkages.
The "wet" style is the first photo:

The drum style below:
