Quote:
Originally Posted by WDE82
The only confusing thing is why BMW/Ate have the piston diameters on the outlet ports. It seems to suggest those are the working piston sizes, but apparently not.
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The ports in the rear position go towards the take-up piston. Notice also in your attached ECS photo that the outlet port is angled back towards the take-up piston. I'd bet the valve is inserted from the bore side and not from the top like in most illustrations.
I suspect what you see is a retaining pin for the piston assembly in the forward position . I'm unwilling to disassemble my new M3 master cylinder to find out.
