23mm MC plumbing question Options

[Qarl]

I will be installing a 23mm MC to feed the bigger brakes on the new car. I have heard that their are plumbing issues, and clearance issues when installing the bigger MC.

I'm looking for feedback from those that have done this.

Here is a comparison of the new and old MC. I have some questions.

1) Ports 3 and 4 are the front and rear output ports. These correspond (location-wise) to ports 1 and two on the new MC. It seems that I can just transfer the hardware and lines over without any issues. Correct?

2) The locations of the feed lines are different between new and old. Is this going to be a clearance issue?

3) The hydraulic pressure switch (located between ports 3 and 4) does not have a corresponding location on the NEW MC. But there is another output port on the bottom of the MC (underneath port 1) that I can use? Any clearance issus here?

4) Does anyone know what the bolt on the top of the NEW MC is for? (between the red caps)... If I remove it, will a genie come out and grant me 3 wishes?

These would be easier to answer if my car body were in the same location as my parts. (hopefully in a couple of weeks!)

Thanks!

[ArtechnikA]

1) It seems that I can just transfer the hardware and lines over without any issues. Correct?

2) The locations of the feed lines are different between new and old. Is this going to be a clearance issue?

3) ...there is another output port on the bottom of the MC (underneath port 1) that I can use? Any clearance issus here?

4) Does anyone know what the bolt on the top of the NEW MC is for? (between the red caps)... If I remove it, will a genie come out and grant me 3 wishes?

been a long time since i did this but it looks familiar. thanks for posting 'cause i'll be doing this in the 911 before spring ...

1) yes. i'd use the back port (2) for the front brakes. i don't recall any issues with the hydraulics.

2) only one inlet is different. i recall the steel lines that plug into the MC have a jog in them. i remember twisting those around so that instead of being parallel, there was an 'X'. but having done that, it fit fine.

3) i don't recall any brake light fitment issues, so if there were any, they were minor...

4) DON'T remove the bolt. you'll only want ONE wish, and that'd be that you hadn't removed it! the original MC's were pretty simple. if anything failed internally, everything failed, and you had no brakes. the bolt is a stop - if the front piston collapses completely, the aft piston will stop against the bolt that protrudes into the bore and give you SOME braking. this is why i recommend using the aft piston for the front brakes - it's your 'fail-safe' circuit. (please review the usual brake references and verify i'm right on this - i did research it, but it's been a while. if i'm wrong, i want to know it! 'cause i'll be plumbing my brakes too and i need to know!)

good luck ! if you find out something's different, pls report back. this time, you (instead of me) get to be the pioneer here ...