Brakes ? cause howling noise

Hello dear forum community, maybe someone has some experience about this problem: In my CRV II, 2.0, Bj 5/05, 110 TKM, for 3 months sometimes a not very loud, but clearly perceptible howling sound from the rear is heard. Now you could think of wheel bearings or differentials (I say as an anti-technician), but apparently the noise comes from the brakes, as it is immediately gone when you tipt on the brake, but unfortunately comes back immediately. If d Then it is parked and after some time it is put into operation, nothing, no noise. Then after 50 km again noise. I understood the brake discussion 2009 here in the forum so that noises that occur there during braking were criticized. Here it is turned around, it goes away during braking. I know that remote diagnostics are difficult, but maybe someone had a similar phenomenon, and unfortunately I did not have a workshop of trust (I needed to wg. of the CRV in the last 3.5 years also not). Greeting Leberwurst