I had an old Michigan 75A loader. I believe the 75A was an older machine than what your looking at. It had the Waukesha motor and I was able to get parts since Oliver used the Waukesha in their tractors. Some things were specific but most engine parts can be crossed to the Oliver line.
I also never had brakes. I attempted to fix them but never got it done. Parts were about impossible. I even called a boneyard but they refused to sell any brake parts. I did find a rebuild kit for the master cylinder with some luck but by then I had learned to live without them. I have a Hough now and it doesn't have brakes either. I just use reverse and feather the throttle. This machine has a driveline parking brake but needs shoes. Maybe someday. These loaders are great machines that can handle lots of abuse.