2011YMoore

I have a 2011 IS250 with 79,000 miles that has recently, within the last month, started making a pop sound when you stop. I've googled it & there are many suggestions as to what it may be but was hoping someone on here would maybe know. I put 20" wheels on the car about 8 months ago but not sure this attributes to what the problem may be. At the beginning of the year I had brake work done, swivel pins & brackets replaced, at least that's what I think they said. I'm hoping the current problem has an inexpensive solution as I have already dumped $2000 into repairs this year.