Master cylinder banjo bolt thread size?

You probably wouldn't think a simple bolt could cause any problems, but after threading my master cylinder with one the other week, my replacement cylinder came today and thought I would screw in the brake lines prior to swapping the cylinders over. The bolt the new (used) M/C came with fitted fine but it's only for a single brake line (one hole) so went to put my dual line bolt in ,which is the same barring having holes for 2 lines, it screws in about half a turn and doesn't want to go any further. Needless to say I didn't try and force it for fear of threading another M/C.

It's weird as my bolt was in the old M/C so you would have thought it would have fit straight back in. The only difference apart from length, is that the bore of hole through the bolt is narrower on my old bolt then the new single hole bolt, could that be the reason?

Anyway, I'll just have to order another bolt and try that, where's best to go to? The code on the single hole bolt is 7P, does anybody know the code of the dual line banjo bolt?

[TamSV]

Compare the threads on the two bolts - they're probably a different pitch (i.e. one has bigger threads than the other). You need to make sure you get a new double bolt with the correct pitch thread.

If you need any of those bolts back from when I bought your lines, let us know.

Originally Posted by TamSV

Compare the threads on the two bolts - they're probably a different pitch (i.e. one has bigger threads than the other). You need to make sure you get a new double bolt with the correct pitch thread.

They do look the same but what you say must be the case with it not wanting to go in, I'll post a pic later of the 2 bolts (bet you can't wait!!)

Just done a bit more digging. The lines that I removed were HEL braided lines and apparently they (HEL) are notorious for sending out the wrong pitch banjo bolts so god knows how it even got in there in the first place.

Does M10 x 1.00 sound like the correct pitch to you?

Also when I was digging I've come across these, worth the extra expense?

http://www.svracingparts.com/product...roduct=1747418

Originally Posted by M65

If you need any of those bolts back from when I bought your lines, let us know.

They were both doing the same on my cylinder so both must be the wrong pitch. Just hope you've not tried to use them on yours and thread your M/C too!

[TamSV]

Originally Posted by dirtyred619

Does M10 x 1.00 sound like the correct pitch to you?

I'm pretty sure the pointy is 1.25

Think I'm best trying to find somewhere local that sells them, take the M/C with me and try them out. The smallest things are a right pain!!!

[andrewsmith]

There is a difference between late 90's and current master cylinders! I've found this out at the cost of a M/C!
The later pointy M/C's are 1.25 pitch

Stolen from Goodridge

Originally Posted by http://www.goodridge.net/documents/downloads/retail/GoodridgeCat_low.pdf

Suzuki
All Suzukis pre 1994 used 10 x 1mm bolts throughout. From 1994 Suzuki used
10 x 1.25mm bolts on the front calipers only and 10 x 1mm on the rest of the bike.
From 2002, all bolts are now 10 x 1.25mm
WARNING – There are exceptions !

Originally Posted by dirtyred619

They were both doing the same on my cylinder so both must be the wrong pitch. Just hope you've not tried to use them on yours and thread your M/C too!

Not yet but I'll try to reuse my original ones first now that you have warned me. Cheers for the heads up.

That's what I'll ask for then when I go the bike shop tomorrow and try them out. My current (now knackered) M/C is of a K4 and replacement of a K3 so will be the same.