SOHC.co.uk Forums > CB500/550

brake bleed screw size?

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neat street:
Hi all, I have just got a new bleed screw for my 500 front caliper and it is 7mm? it seems that this is `standard`? mine takes a 6mm. did honda make two different sizes of bleed screws?
thank you for your input.

Nurse Julie:
7mm is the standard size on 500/4. That's the only size I know of as standard, the 750/4's use 10mm.

neat street:
7mm is the standard size on 500/4. That's the only size I know of as standard, the 750/4's use 10mm.

Thanks Nurse Julie :-) dont understand why mine is 6mm? thread pitch is the same

Nurse Julie:

--- Quote from: neat street on September 27, 2025, 03:54:05 PM ---7mm is the standard size on 500/4. That's the only size I know of as standard, the 750/4's use 10mm.

Thanks Nurse Julie :-) dont understand why mine is 6mm? thread pitch is the same

--- End quote ---
I've known owners to helicoil a knackered thread and fit an insert down to 6mm as that was the size bleed nipple they had laying about at the time🙄🙄🙄.
The 350/400/500/550 all use the 7mm.

taysidedragon:
Is it a pattern caliper with a different bleed screw to a standard one?

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