Hello, I hope someone can help me. Since yesterday, the battery light lights up when braking. After stopping, find out that cooling water also boiled. During the ride, it only flashed off and on very briefly. However, as mentioned above, during braking constantly. What to do. Can it somehow be related to the fact that radio was installed 3 days ago. Would be grateful for quick help. Punto 176 from 99 Gruss Susanne