1981 300D

Hi Guys,

My car has been losing brake fluid for the last few weeks. The calippers are dry and the lines seem to be ok. This morning I noticed some weeping between the master cylinder and the booster.

Do you guys think I need to replace the master cylinder or could it be just the seal that goes between the master cylinder and the booster? Is it a good idea to rebuild the cylinder with a repair kit?

The brakes are working just fine.

Thank you.