Jump to content

Center nut plug for Brake Master Cylinder (Nabco)


Recommended Posts

Hello everyone,

Help... I am in trouble following the purchase of a brand new Brake Master Cylinder for by USA 1989 NA Z32 : the middle plug was not supplied with the BMC, and my old plug (from my OEM BMC) cannot be fitted inside as the geometry of the cone differs... Detail below :

1st photo : The 2 BMC

   - LEFT : my old OEM BMC + its middle plug (conical "convex" shape)

   - RIGHT : The new Nabco I just bought, delivered without center plug...

2nd photo : detail of the new Nabco I just bought : we can see that the hole has its conical shape inverted, making the fitting of the old OEM plug impossible.

In conclusion, I need another "concave" plug.

Would anyone have this somewhere ? I would be really grateful, as the car sits currently in the garage...

Thanks a lot !



Link to comment
Share on other sites

  • advertisement_alt
  • advertisement_alt
  • advertisement_alt
1 minute ago, JaiKai said:

They are just grub screws; however not sure of the thread type.

Thanks for the answer.

I supposed so to, but cannot help to think there is a specific shape on the tip (see first picture of supposed Nissan plug needed)...


The technical datasheet of the BMC I got is as follows. "Right CTR" is given at 10x1.0 inv. I assume this means M10x1mm. Inverted must mean here, that the cone in the BMC in convex, and not concave as on my old OEM BMC. 


  • Like 1
Link to comment
Share on other sites

12 minutes ago, JaiKai said:

Are you saying that the new BMC center hole that needs plugged doesn't have an inner thread ?

Yes it does, as usual (we don't fully see it though on the photo of the 1st post, I admit !..).

Problem is really, that the small conical shape you have at the end of the thread, is inverted compared to my old BMC ! meaning you can screw the old OEM plug, but after 2 turs you get in collision with this inverted conical shape = no possible fluid tightness

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...

Important Information

Terms of Use