To me the price sounds fair. If it sounded strong I would guess a tune up should cure the starting issue. I would add that if it is still on 6volt make sure everything is up to snuff on the starting system. Cables should be either 0 or 00, etc. Converting to 12 volt will cover for a multitude of sins in the electrical system.
As to the brakes yes they are not that complicated to adjust. Replacing is another story altogether. There is a pin that holds the bottom of the shoes that without the proper puller can be next to impossible to remove. The proper puller cost me about $100 about 5 years ago.