Anyone know of a source for the brass seats (inserts) that are found in things like the master cylinder and the brake distribution block/switch that the flared brake lines seal to? Seems like I can only find one size. The distribution block, for example, has multiple sizes.

 

Why are you replacing them ? Could you send a pic?

 

This is not a normal wear item. I'd be amazed if you can find a source for them. The ones in the distro block are typically machined into the block and not a separate part. Yeah, you would think that M/C rebuilders have a source, but I suspect they are only sold wholesale in boxes of a thousand or so at a time.

 

Joe I believe you're correct. I've found them for the master cylinder and for power steering pumps. The cast iron brake distribution block uses five of them. Depending on the year it looks like there are perhaps 3 (or more) sizes. I was restoring one of these and pulled the two end seats out to remove the little piston and replace its O-rings. Those two are different in size.