kyon98

I have a 2003 SL500. I recently changed (drained and replaced) some of the ABC hydraulic fluid within the res along with the filter. There was a rubber gasket associated with the ABC res cap that I lost somewhere and now my benz drops (assuming losing pressure) within minutes of turning the vehicle engine off. Do anyone know the part number of that rubber gasket (o-ring) for the ABC resorviour cap?

Thanks for your support in advance!