That works guys. Thanks!

Cheleker: that's a great way to remember it!

The one on the left in Wille-Bs photo is the brake master.

Here's a different way to remember them which works with cans and plastic. Now don't laugh.

Look down from the top. Draw an imaginary straight line between the filler hole and the pipe/outlet hole. Then draw an imaginary line between the two mounting holes on the base. If the lines cross, it's the brake master. If the lines are about parallel, you have a clutch master. But wait! There's more. Pretend the lines are roads. If the "roads" cross one is likely to have to stop...and to stop one uses brakes.

Lesson over.

The brake master has the holes in line with the flat area on the side, the clutch master the holes are at an angle.

isn't there a part # on them?

I know this never happened to you, but let's say a "friend" was examining both of your nice new plastic reservoir master cylinders and didn't pay attention to which was which, how can you now tell which is the brake and which is the clutch? As I don't have them here in front of me I can't remember if they have any external markings. I don't think so. As I recall they are "handed" in that the bases are offset so they will fit side by side. If they both are 3/4" measuring the bore won't help. I don't want to take them apart, but doesn't the brake master have an extra valve at the top end of the spring that the clutch doesn't? Does the brake have a larger base to it? Different color dust caps in the outlet ports? There must be some easy way to tell them apart! Thanks in advance!!