I remember watching this show way, way back when I was about 7 or 8.
I recall that I really enjoyed it. I especially liked the SCUBA rescues they did.
Another reviewer called in a cross between "Baywatch" and "CHIPS". Personally, I always saw it as an attempt by ABC to duplicate the success of NBC's "Emergency".
The format was basically the same. You had two partners, who were rescue specialists in their departments. They spent the majority of their day rescuing hapless citizens from the predicaments they had gotten themselves into. The primary difference was that "Emergency" was about the L.A. County Fire Department, while "240-Robert" involved the L.A. County Sheriff's Department.
I do wish that they would bring this show back in reruns. I think that an awesome combination would be "Emergency", "CHIPS" and "240-Robert" all running back-to-back with each other.