Join Date: Oct 2005
Location: Southern California
This is a known issue on the F4 so I assume the Brutale will be the same. You almost have to run your coolant level at the minimum mark or you will experience the "Boil Over" via the overflow tube as you explained.
Now if your water pump was leaking, you would not see the coolant coming from the tube, however, it would be coming from the circumference of the water pump itself.