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Does anyone know what the thread size is for a 12mm banjo bolt? It is probably M11 by something. I tried to match it up at NAPA but they go from 10mm to 12mm. If there is a 7/16 extra fine thread it may match too.
Here's what I am trying to do. The front brake line looks like this now:
I want to add a brake light switch like this, and was going to tap the tee to make it fit:
I suggest you find some Loctite 542 hydraulic sealer, you'll need it for that rig it'll never quit leaking without it. I use this stuff regular with custom brake & multiple fitting setups. Take a long hard look before you get busy drilling & tapping may not have enough meat left when done, maybe have an extra tee handy too.
Run into the same issue drill & tap deep enough for the new banjo fitting you may wipe out the needed flare seats for the other 2 lines. Somebody makes a fitting for what you are doing check Russel or Goodridge.
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