Oil brake need to be top full. Oil level brake sensor is very sensitive.
My RT is getting louder and while at shop the other day I asked the mechanic how long it took to replace them and he said 2 hours, but not to worry about it until it got louder or started to backfire. With 29K, I'll stretch it out a little longer and try to time it when some warranty work is being done to possibly save a few bucks. They're still trying to figure why I keep getting a "faulty brake" light so it'll be back in for more tinkering sooner or later. The $1000 VCM replacement didn't do the trick!