Everytime i operate the car for more than a half an hour, dark brown hydraulic fluid leaks out of the top of the reservoir. Car rides nice but leaks out this fluid two to three tablespoons everytime it's operated for more than a half hour? Any idea whats going on here?

__________________
jcciem
'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000