I only had the reverse squeak done (front brakes?) and I found it didn't help much for the first month, but then gradually went away and now I have no issues. But, when reading your description, the first thing that popped into my head is perhaps you have something as simple as some debris trapped or embedded on one of your disk pads.

Two climate control systems, one inside and the other at the tailpipe.

2007 Camry Hybrid (in service June 2006)
FE: 6.77L/100km (34.8 mpg) over 37750km (23450mi)
75% city - Ave trip 20 min - 2 Winters