Front Brake bleeding

[ShaunJ]

I am slightly confused about the front brake on my K7. I need to change the brake fluid and the bleed nipple, well it doesn't have a nipple just a hole. I am sure you can imagine my disappointment 

I ordered up a new one for a K7 from DS but it won't fit, mine appears to have a narrower shaft. Looking in the Haynes manual the calliper looks different I am guessing that the brake design changed at some point unless mine is non-standard.

Have I just got the wrong part or is there something different about the brake? Pictures are of the the new one supplied by DS and the calliper.

[cb750stu]

Hi,

I had the same problem the ones I ordered from DS didn't fit so I got them from CMSL instead,

Calipers look the same as mine if the K7 are the same as the F1 ??

I also noticed that the nipple on the rear caliper was a different size as well !!!
Cheers

[LesterPiglet]

Looks to me that nipple has broken off and someone tapped it out for a larger thread.

[ShaunJ]

No the replacement is larger than the one I have. There is no sign of any repair ever being done but I guess the bleed nipple can't be original.

I have been checking part numbers both CMSNL and DS say it is 45224579013. That is the part that DS supplied according to the packaging although it is a replica of the oem part. It would cost 27 euros to get a look at the CMSNL part ... for a bleed nipple gulp.

[LesterPiglet]

Go to a motor factors with the item in the caliper. A nipple is a nipple.

[mick]

Hi Shaun in the first picture were the nipple should be is that what's left of the old nipple or something else? cheers Mick

[LesterPiglet]

Same as the third pic Mick. Looks like a bolt with a small hole in it.

[mick]

I was just wondering if it had something like this in it? cheers Mick

[LesterPiglet]

It looks more like the bolt holding your brake line.

[ShaunJ]

My brake looks just like Mick's photo but I have a solid brake pipe rather than a flexible. Here are some photos of the existing bleed nipple alongside the replacement so you can see the size difference.

[Waggles]

Brake caliper looks identical to my F1 which isn't surprising I guess as they were produced at the same time. Definitely should have a nipple of the same type but I had difficulty finding one initially as I wanted to change it to a stainless one. I ordered one from Wemoto but it didn't fit. I returned it and sent them details of the size and they supplied a suitable one ( not stainless unfortunately ). Can't remember cost but it weren't 27 euros!

[Bryanj]

The one in there is not standard and has been home made. If the thread is the same the one supplied by DS is OK if its been tapped out you need a repair kit like the one in Mikes picture which i imported several of from the USA and have a few left

[RickyC83]

I got myn from probolt. Just measured diameter and thread pitch

Sent from my RM-875_eu_euro1_260 using Tapatalk

[ShaunJ]

Thanks for the advice. Just to be clear the replacement bleed nipple is too large, it is not that the calliper has ever been taped out. I am going to see if I can source a replacement locally first. I will also query with DS if the pattern replacement the supplied is actually identical to the oem part.

[ShaunJ]

Had a prompt reply for DS as follows....

Hello

Sorry to hear that you have a problem with your bleed nipple.

The CB750 K7 nipple is 7mm and all the stock I have checked are 7mm. We have
sold 241 of them this year and as far as I am aware we have had no problems.
The originals we sold 14 again without any problems and I have compared the
parts which show no difference.

The earlier K6 models used a 10mm and the only other sizes are 6mm and 8mm
on various other models.

We can only think that your caliper has been modified or is from a different
model not necessarily Honda as the brake manufactures sold to various
makers.

Do you know of another K7 that you can look at?

Regards
Gerry

So I am baffled as I still believe the caliper is original and un-modified.