Bob,
I have ERA 626 the resivior is the BMW one. The fluid seems to sit right below the hose that goes to the clutch cylinder. When I add fluid and dont drive the car it seems to stay full but when I drive the car it leaks a puddle on the floor. I put the car up on a lift and I cant find where it is leaking from? it seems to be wet at the frame where the foot box meets, but the clutch cylinder seems dry? this is baffling me because the hose goes directly into the clutch master cylinder. Maybe when I am driving the car is is spraying out on the chassis? any thoughts? I can simply leave it where it sits and it drives fine but its bugging me.