I have a problem with the ASR on my 129 SL500, basically, after starting the car, the light does not come on, only after a minute or so. But during that the time the light is not on, i can boot the car round corners and the ASR will prevent it from fishtailing. But when the light does come on, i can fishtail and do donuts to my hearts content!! There is no loss off power when the light does come on. But during the 1st minute, there is a humming sound coming from the rear of the car, sounds a bit like a pump running, but after the sound disappears the ASR light comes on. What could be causing this? Any help appreciated

Prit