...there is maybe a hairline crack and a welding seam in the front brake drum

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Wolf
Posts: 18
Joined: Tue Nov 16, 2021 5:03 pm

...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Wolf » Tue Nov 16, 2021 7:40 pm

Yes - it is a dual single shoe brake, one side there is maybe a very fine crack and on the other side of the hub the drum way have been welded.
First of all - it works very well - only when cold/have been sitting for a while it tends to screech but the retardation is always impressive.

What do you think - should I do anything? Or just drive on?

Many thanks and kind regards

Wolf
Attachments
this may be a welding seam.jpg
this may be a hairline crack.jpg

blethermaskite
Posts: 279
Joined: Thu Mar 01, 2018 1:06 am
Location: northern ireland

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby blethermaskite » Tue Nov 16, 2021 9:11 pm

never seen a repair like that :o I certainly would not be happy to keep on using this......if this started to come apart while you were out on the road the result could be fatal, I know these particular brake drums are now getting expensive and a bit hard to get but how much value do you put on your life .......this is just my opinion others may differ.
Cheers,
George

Wolf
Posts: 18
Joined: Tue Nov 16, 2021 5:03 pm

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Wolf » Wed Nov 17, 2021 1:59 pm

George,

thank you for your worries -this is the reason for my post that I am in doubt wether it is safe to ride it. The previous owner was aware of the cracks and told me so.
I've just ordered a "Dye Penetrant Inspection" -system. I will let you know what I'll find.

Just say no to crack

Wolf

Ducadini
Posts: 27
Joined: Sun Sep 24, 2017 9:02 pm

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Ducadini » Wed Nov 17, 2021 10:49 pm

Didn't even know it was possible to weld that without damaging the aluminium exterior.
Could it be that the bike has been left sitting for a while in a damp environment and the brakeshoe left an "imprint" ?
If I find a damaged drum, i'll cut it to see how the iron inner and alu outer are "connected".

ciao
ducadini

Wolf
Posts: 18
Joined: Tue Nov 16, 2021 5:03 pm

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Wolf » Sat Nov 20, 2021 5:02 pm

...here are the results from my crack inspection:

The one where I was very certain that it might be a crack is maybe not, visible in the first picture.
The one which looks like a welding seam did show a respone, but this is maybe caused by a not complete removal of the red agent.

I will skim the brake drums on a mill and will redo the crack detection test.

Cheers

Wolf
Attachments
IMG_20211120_151130.jpg
IMG_20211120_143637.jpg
IMG_20211120_142147.jpg

blethermaskite
Posts: 279
Joined: Thu Mar 01, 2018 1:06 am
Location: northern ireland

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby blethermaskite » Sat Nov 20, 2021 7:21 pm

really interested to see the result of the skim test. I have been were you are with this before only on a Very expensive 4ls racing brake drum.
Cheers,
George

Eldert
Posts: 700
Joined: Sun Nov 01, 2009 3:23 pm
Location: Hazerswoude Rijndijk Netherlands

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Eldert » Sat Nov 20, 2021 9:09 pm

you can put new liners in . already replaced 210 and 230 mm liners with turned down car drums .

180 mm is a very common diameter for car drums . i think VW fox has them to

Eldert

graeme
Posts: 849
Joined: Sun Mar 25, 2012 12:00 am
Location: Tasmania Australia

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby graeme » Sat Nov 20, 2021 10:46 pm

We’re the cast iron drums cast into the hub or shrunk in to the alloy originally ?

Graeme

Wolf
Posts: 18
Joined: Tue Nov 16, 2021 5:03 pm

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Wolf » Sun Nov 21, 2021 1:39 pm

Hi Eldert,
this is an information of great value! You just put the hub on the lathe, remove the old brake drum and shrink a machined VW sparepart into the hub? Sounds promising! The will be the last option, if the skimming of the brake drum will not work in the intended way.

Although I have to admit, that shrinking parts into another is always very exiting for me...

Many thanks
Wolf

Wolf
Posts: 18
Joined: Tue Nov 16, 2021 5:03 pm

Re: ...there is maybe a hairline crack and a welding seam in the front brake drum

Postby Wolf » Fri Dec 10, 2021 4:07 pm

...the machining is done, tomorrow I hope to do the crack inspection.
Attachments
IMG-20211210-WA0010.jpg
Last edited by Wolf on Sat Dec 11, 2021 4:10 pm, edited 1 time in total.


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