Is it Dangerous to drive with bad rear brakes?
Nah, man/?. Perfectly safe. I do it all the time. (just kidding).
The rest of the posts are taking care of your issue, but I have to ask, how is this thing driven?
Rear brakes are hardly used in most passenger car service. Even pickups, the way most people truly use them (they don’t tow or haul anything of merit), the rear brakes a hardly wear at all.
My wife’s 1999 Wrangler and my 2002 Wrangler have the OEM rear brakes (drums on rear) with 180k and 90k respectively. The front pads have been service multiple times on both.
Even my 92 Caravan (dearly departed due to theft) took 14 years to require rear brakes (load sensitive proportioning valve).
Given 8-9 years and 150k miles, this unit must have seen very little braking. That’s between 17k and 19k a year.
Who has been using both feet while driving?