Rear brake nipples

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Jon_Dodson
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Rear brake nipples

#1 Post by Jon_Dodson » Sun May 09, 2021 12:19 pm

Are they all a standard thread size across all cars (modern and old)? I’ve always struggled to bleed my Mk2 because the back plate gets in the way. The hex bits are now quite mangled. I’ve seen extra long nipples advertised on Amazon but the advert doesn’t describe the thread so I’m hoping they’re all standard? Kinda doubt it for an AF car in a metric world, but thought I’d ask here anyway in case anyone knows for sure. Thanks, Jon.

wild bill
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Re: Rear brake nipples

#2 Post by wild bill » Sun May 09, 2021 6:46 pm

I think you'll find that the ones advertised are metrics when I was working,I used to fit them.I did take one and re-thread it UNF to suit the prop shaft and other grease nipples, but I certainly would not trust putting modified ones into the brake cylinders.
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johnnydog
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Re: Rear brake nipples

#3 Post by johnnydog » Mon May 10, 2021 12:08 am

I have a good number of new rear wheel cylinders, both nos and new aftermarket. The thread size of the bleed nipples does vary, as some aftermarket cylinders have larger sized bleed nipples. The length of them varies too. I try to fit replacement cylinders with longer bleed nipples for the exact same reason as you have found.
I would be tempted to remove one, go to a good hardware supplier that can check and establish the thread type / size and then locate longer bleed nipples based on the thread size which should make the job a lot easier.
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

Jon_Dodson
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Re: Rear brake nipples

#4 Post by Jon_Dodson » Mon May 10, 2021 11:33 am

Thanks both. Good idea about getting it measured (they are actually aftermarket cylinders/nipples). I think there’s more air than fluid in the system at the moment anyway so I shouldn’t lose much.

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Re: Rear brake nipples

#5 Post by johnnydog » Mon May 10, 2021 1:11 pm

If you put a hose clamp or even carefully placed molegrips on the the flexi pipe, then you shouldn't loose too much before doing a full brake fluid change and bleed when you get longer bleed nipples.
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

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