New to the RV, 81 Shasta (22'?)

Thanks for the advise. I will flush the brake fluid and replace the fronts. I will inspect the rears and replace if needed. Im still having problems finding an owners manual for this 81 Shasta motorhome. As for the valve thats leaking I think its for the fresh water. I took a garden hose and tried to fill the holding tank, but it poured out a tube under the RV rasing straight down. looks like there was a valve but the handle is missing now. Not sure where to get a gas cap because I dont know if I should refer to it as a E350 1 ton van or if the RV takes a different cap. Same for the sending unit. I have dual tanks, the back leaks and the front has a bad sending unit. I want to replace the back, but no idea what to order. Family outings at least for this year will be 10-15 miles from home and IL in mostly flat land. No hills for where we are going. Next year id like to take it for a real trip.

Welcome to the forum and the world of RVing.
First for me would be the brakes. Flushing the old brake fluid would be my first item. Brake fluid will accumulate moisture and that will eventually boil when in harder use, giving no braking. I came down a hill, through a red light, and finally got stopped in a Church yard one time. From then on I flush brake fluid every 2 years. That was an '89 E350. Check the brands of appliances and see what you can download on line from each manufacturer. You will need model and ser. # for many. I will assume you mean black tank valve is leaking. The valves are replaceable and not that expensive. Before putting the family in I would check the tires for age. RVs very seldom wear out a tire but they do rot out on us. A tire with a lot of tread can blow as easy as a bald one. You can get new catches for the cabinets at any home improvement store or if you want more expensive you can go to an RV dealer. How does your table mount? If it has the tube with tapered ends ou may have to work on expanding the ends a little.