ABS Module Pump Leaking W210
 

Hey guys I had a question about the ABS module pump. It's a 99 e300. I'm losing pressure in the pedal whilst losing brake fluid from the ABS pump. Its leaking right above the motor from this little black plastic plug. Am I going to have to replace the abs module pump or is this something i can rebuild myself? Like something as simple as an O-ring. Heres a picture of what im talking about. http://thumbs.ebaystatic.com/images/g/DQAAAOSwpDdVcJvw/s-l225.jpg