I have a '91 350SDL. Occaisionally the ABS light comes on and I feel a load put on the engine. I assume it's the ABS pump that is the load. The weird thing is that the tach quits and also if the A/C is on, the A/C clutch kicks out. When this happens it usually happens for quite a long time -minutes rather than seconds although sometimes it is only a second or two.
The threads say to check the sensor, the harness connections to the ABS unit and the relay. The only thing I can find is the ABS unit with the electric motor and the brake lines going in and out. Is there another ABS unit? Also where is the sensor? (I used to have an '82 240D and had the Haynes manual. Is there a manual for this car?) Or a CD?