Brake pipe grommet

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Brake pipe grommet

Postby PLP » Thu Dec 21, 2017 4:34 pm

There is a large grommet in the back of the box channel where the master cylinder lives and where the rear brake pipe goes through the grommet to the rear brakes. It’s a large thick beefy looking grommet that does a good keeping out water and dirt/salt getting into the channel. The grommet size is about 32mm dia. and the hole size is about 20mm (chassis hole) and brake pipe size hole in the centre. It looks like it was made for the job. The Bull Motif Spare part CBS116 is not the same type of grommet. Does any one know where I can buy one please.
Geoff
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Re: Brake pipe grommet

Postby woodywoodchipper » Thu Dec 21, 2017 6:35 pm

not sure you can,

I use a blank grommet, like what you get in later cars boot area, and punch a 1/8th hole in centre and slide it over brake pipe when making up, then a good sealing with tiger seal or underseal,
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Re: Brake pipe grommet

Postby Custard » Fri Dec 22, 2017 1:36 am

Similar, but I have a stack of electrical grommets, 20mm is about the size on the back boxes for sockets and switches.

Depending on what you are doing you can put a hole in a solid blanking grommet, or for places like the solid pipe at the front going through the tie plates cut a normal grommet so it can be used in the smaller hole.

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Re: Brake pipe grommet

Postby PLP » Sat Dec 23, 2017 9:44 am

Yes I have considered a blanking grommet with a sealer. Thank you for your suggestions.
On another subject, this is about bubble flare and double flare brake pipes.
I am replacing all brake pipes with Kunifer pipe and cannot find out where to use each type of flare. The trouble is I cannot rely on what has been fitted by the last person who replaced 90% in copper. (and did not make a very good job)
The off side rear pipe is steel and uses double flares (probably original) while the rest in copper use bubble flare. Any idea please.
Geoff
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Re: Brake pipe grommet

Postby woodywoodchipper » Sat Dec 23, 2017 3:52 pm

I think there all bubble flares,which get compressed as you tighten them, as most hard fittings have concaved bottoms,

I have an incomplete set here and has bubble on what i have ,
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Re: Brake pipe grommet

Postby Custard » Sat Dec 23, 2017 8:49 pm

Check carefully, there are some double flares, but I cannot remember of the top of my head where they go.

As Woody said most hard fittings are just concave base so take the bubble, but if you look in and see a cone shape towards you it needs the double flare.

Check them all but in particular the banjo fittings to the rear wheel cylinders, the one on the rear of the master cylinder.

It is a while since I have made any, but there are definitely some that are different ends on the same pipe.

It is further complicated as quite a few of us are running different brakes so have non standard pipes anyway.

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Re: Brake pipe grommet

Postby Custard » Sat Dec 23, 2017 8:56 pm

This is the difference when you look in.

https://www.kartek.com/mm5/graphics/000 ... ttings.jpg

Last two show the pipe flares.

http://cyoum84abk-flywheel.netdna-ssl.c ... -types.jpg

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Re: Brake pipe grommet

Postby woodywoodchipper » Sun Dec 24, 2017 3:28 pm

Thanks Sean, its the axle thats missing from my set, and I think your right about the banjo bolts,, :oops:
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Re: Brake pipe grommet

Postby PLP » Sun Dec 24, 2017 4:04 pm

Interesting because the old rear brake pipe from the master cylinder has bubble flares
and the wheels to brake union pipes have double flare. So check what it’s going into is the answer. Many thanks for your input.
Geoff
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Re: Brake pipe grommet

Postby emjay » Mon Dec 25, 2017 5:19 pm

Checking the female end is always the best practice. The double flare is associated with UNF fittings and the bubble is with BSF fittings. All fittings should be bubble except the bridge pipe for the front wheel cylinders. The T on the rear axle may be the one exception. From early 1000 production the T is UNF going in and BSF going out. I can't recall if the incoming hard line is bubble or double flare. A quick visual would confirm. Of course anything could have been changed over the years.
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Re: Brake pipe grommet

Postby PLP » Tue Dec 26, 2017 9:23 am

Thanks for that. Having made bubble flares for the front T, I have taken them off and will convert to double and will take the back T off to check.
The good thing is you can convert to double flare from bubble but not the other way round.
The master cylinder banjo should be bubble because it’s BSF.
Thanks
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