Hello, I get a short “crack” sound when I release the brake on my Volvo 850, which I can’t explain to myself. At first it only occurred when the brake came on while driving, but then it continued to roll. At the moment it also occurs once in a while when I stand at the traffic light and take the foot off the brake. The couplings (stabil) rods were changed the other day, new crossbars were installed and the brake discs are also new. I was told it could be due to an imbalance in the brake disc, but it wouldn’t be too bad. What do you think?