The break small cylinder is leaking at the right side back.
just keep in mind brakes are a saftey item.
if you could have both rear wheels and drums off then dis assemble linings then remove wheel cylinder and replace, assemble up the same as other side to copy. borrow some maintenance repair books from library or google procedures from manuals with drum brakes all have same principals.some front wheel drive vehicles have wheel bearings that need repacking with grease when removing drum and hub as one and more importantly have the do up nut by feel rather than torque up to setting hub nut and some drums come straight off from hub leaving bearings and hub on vehicle.
garage jack, saftey stands, wheel brace to remove wheel nuts, brake hose clamp, side cutters(pliers),flat head screw driver, hammer, socket set, spanner set,mostly 10mm ring and open ended spanner for wheel cylinder