Topic: Repair or replace brake drum steel lining possible?

[PeWe]

I have an old CB750 rear hub with a cracked brake drum. It's a pity to not be able to use it due to a crack.
- Has anyone here repaired or replaced the drum on a hub like CB750?

See photos of the hub I have. (1)
More photos of another wheel I could buy but stayed away due to the crack. (2)

It would be fine if this should be a std replacement procedure by brake/machine shops. Get new lining for max 150 USD installed and ready.

[CycleRanger]

I'm pretty sure that part was cast in at the time the hub was made.
The old liner would have to be turned out on a lathe then a new iron liner would have to be fabricated to shrink-fit into place. (And additionally secured so it wouldn't slip when the hub heated up.)
Very expensive to replace I would expect.

[PeWe]

OK, so both hubs are not possible to use? To the scarp yard recycling the metals....

[CycleRanger]

OK, so both hubs are not possible to use?

Well, I personally would try not use them but I'm sure replacements are easier to come by in the US.

Other folks opinions might differ from mine.

[754]

For practical purposes, not repairable , too bad you are in a place where it us hard to get used ones.
 Be care full buying used, many are quite worn.

[trigger]

Easy to repair, done a few of these. I like to pin the liner in. You need a big lathe and find a car brake drum that is near the size.

[PeWe]

Sounds good. To which bike did you do and which car brake drum could you use?
Like the UK guy?
http://forums.sohc4.net/index.php/topic,147064.0.html

CB750 is has different brake or same size? Max inner 180 mm. I guess std size can be around 178 mm.

[trigger]

I have put new liners in all of the SOHC hubs and others. I am not sure what the drums are off, as I just give the oversize measurements to the suppliers and they deliver. The oversize car hub then can be turned down to the size you require.
Did have a quick read of the link and the price that the member was charged for the work was a little over the top, I charge $100 for this job in the UK but, my lathe will not take a full wheel, only the hub.

[PeWe]

I have put new liners in all of the SOHC hubs and others. I am not sure what the drums are off, as I just give the oversize measurements to the suppliers and they deliver. The oversize car hub then can be turned down to the size you require.
Did have a quick read of the link and the price that the member was charged for the work was a little over the top, I charge $100 for this job in the UK but, my lathe will not take a full wheel, only the hub.

That sounds promising.
- What kind of shops in general can do this kind of job?
- You are also of the oppinion that both hubs on my photos can not be used, new liner is a must?

[trigger]

I have put new liners in all of the SOHC hubs and others. I am not sure what the drums are off, as I just give the oversize measurements to the suppliers and they deliver. The oversize car hub then can be turned down to the size you require.
Did have a quick read of the link and the price that the member was charged for the work was a little over the top, I charge $100 for this job in the UK but, my lathe will not take a full wheel, only the hub.

That sounds promising.
- What kind of shops in general can do this kind of job?
- You are also of the oppinion that both hubs on my photos can not be used, new liner is a must?

Anyone who has a big enough lathe and a engineering head can do this type of work.
Once a liner starts to crack, it will crack more with heat until your back wheel will lock up. For the price of the job is it worth losing your life.
Do the job once and do the job right !

[PeWe]

Thanks trigger!
If I should live closer to I should ask you to do the job
I'll look for shops around here. Experience of have done it before ensure a correct result and reasonable cost.

[strynboen]

i have turned my 550 hub aut to klean aluminium...there is a rouf gitter casting to sekure the cast iron hub..so some machining are needet to get a klean hub surface...
think brakedrums from car trailers can be used as liner donors..or get made a aly spacer and veld inn..to take a disc brake..use a distance trapped spacer..

i got a better hveel..so have parked the build at the attic..but somday i vill need to build it..as both liners nov have sleigtly cracks..both on my 400 f and 550

[PeWe]

That brake drum has cracks!
I hope relining business can grow fixing our old bikes brakes. A shop that is used how to do and have correct lining in stock  can hopefully fix it for not much. A shop not used to do it need time to do it. Time cost money, at least 100-150 USD/hour.

[RAFster122s]

I have put new liners in all of the SOHC hubs and others. I am not sure what the drums are off, as I just give the oversize measurements to the suppliers and they deliver. The oversize car hub then can be turned down to the size you require.
Did have a quick read of the link and the price that the member was charged for the work was a little over the top, I charge $100 for this job in the UK but, my lathe will not take a full wheel, only the hub.

Is that 100£ or 100$ US...  100$ CDN  might be a deal   sorry to our neighbors and friends to the north, just trying to be funny.

If you have someone visiting the UK on vacation it might be possible to avoid the shipping frieght, but the weight of the hub would limit their packing weight and incur fees for their luggage...
Provided that the hub could be given to trigger with enough time for him to do the work and return it to you...otherwise a lengthy stay would be required.

[PeWe]

Shipping to UK or Germany both ways will add at least £40+20=£60 as a starter.

[RAFster122s]

If you spent some time enjoying Lincoln and all it has to enjoy in a trip to England you could hook up with trigger and make Lincoln a place to enjoy twice during a vacation to the UK.  It is about a 3 hour trainride from London...around 130 miles away.  So, if you did a loop with the loop going through or originating and terminating  in Lincoln, Lincolnshire  you could then go by train or car to London for a flight...if you wished to pack a couple drums to have done and bring them along.  But, you are apt to find a local source cheaper than this.

Whitepost restorations does vintage caliper, master cyclinders and slave cyclinders and other things like that.  They are by no means cheap.  They are in the US and cater to auto restoration guys and gals.

David

[trigger]

#$%*e, me and my big mouth, looks like I will be snowed under with brake liner repairs  That would upset my engine customers  as the back log is a long one. Right, back off to SOHC.co.uk were things move a lot slower.

[PeWe]

No worries mate! The shipping will add too much and I have wheels for the moment.
But you might have a business here
- Where do you get the liner from?
I visited UK December last year, Milton Keynes. No pleasure, work only. I might be open for helping our UK colleagues if it is in the right location

[trigger]

No worries mate! The shipping will add too much and I have wheels for the moment.
But you might have a business here
- Where do you get the liner from?
I visited UK December last year, Milton Keynes. No pleasure, work only. I might be open for helping our UK colleagues if it is in the right location

I get the liners from my local motor factors. I know MK very well, was born in the area before it was built.

[PeWe]

No worries mate! The shipping will add too much and I have wheels for the moment.
But you might have a business here
- Where do you get the liner from?
I visited UK December last year, Milton Keynes. No pleasure, work only. I might be open for helping our UK colleagues if it is in the right location

I get the liners from my local motor factors. I know MK very well, was born in the area before it was built.

They have a ski resort too, who need the alps in MK? :-) All my colleagues think about roundabouts when Milton Keynes is mentioned...

[RAFster122s]

No worries mate! The shipping will add too much and I have wheels for the moment.
But you might have a business here
- Where do you get the liner from?
I visited UK December last year, Milton Keynes. No pleasure, work only. I might be open for helping our UK colleagues if it is in the right location

I get the liners from my local motor factors. I know MK very well, was born in the area before it was built.

Pardon my ignorance but, what is a "motor factor".  Please forgive my implication that it might be possible to do a turn around on the drum liner replacement work in one's typical vacation that many would take of a week or two.  Most of the expense in a vacation abroad is that of getting there if one plans well ahead and shops for good deals.
FWIW, from my perspective...
Often Americans will get two weeks of vacation plus holidays in a salaried position after being there for a year or so.  With senority at a company usual one receives additional days of vacation.  So, often American vacations will be a couple weeks or less unless it is piggybacked to a business trip.
Some companies allow you to take additional time off without pay if you are salaried.  But, there are some I have worked for who do not and it can become a problem trying to take more than a week off.

Trigger, thank you for giving input and instructions as well as personal experience on the subject.  I have an old Honda CA95 Benly Touring 150 rear hub that needs a new drum liner...I had figured it was merely aluminum scrap.

David in Tennessee, USA

[trigger]

No worries mate! The shipping will add too much and I have wheels for the moment.
But you might have a business here
- Where do you get the liner from?
I visited UK December last year, Milton Keynes. No pleasure, work only. I might be open for helping our UK colleagues if it is in the right location

I get the liners from my local motor factors. I know MK very well, was born in the area before it was built.

Pardon my ignorance but, what is a "motor factor".  Please forgive my implication that it might be possible to do a turn around on the drum liner replacement work in one's typical vacation that many would take of a week or two.  Most of the expense in a vacation abroad is that of getting there if one plans well ahead and shops for good deals.
FWIW, from my perspective...
Often Americans will get two weeks of vacation plus holidays in a salaried position after being there for a year or so.  With senority at a company usual one receives additional days of vacation.  So, often American vacations will be a couple weeks or less unless it is piggybacked to a business trip.
Some companies allow you to take additional time off without pay if you are salaried.  But, there are some I have worked for who do not and it can become a problem trying to take more than a week off.

Trigger, thank you for giving input and instructions as well as personal experience on the subject.  I have an old Honda CA95 Benly Touring 150 rear hub that needs a new drum liner...I had figured it was merely aluminum scrap.

David in Tennessee, USA

A Motor Factors is a vehicle parts supplier in the English language  .
I never give a dead line on any job as I may order parts and the delivery may take time and you never know until you order such part. 

[PeWe]

trigger, you do such jobs as fix a bad brake drum? Not in the past only?

[754]

 David they are not scrapped , they become ashtrays..
 Glad someone us doing them  my insurer gave me huge grief when I mentioned the B word..

[trigger]

trigger, you do such jobs as fix a bad brake drum? Not in the past only?

Yes, I am still engineering for my sins  Only been a Honda engineer for the past 27 years and I still specialise in the SOHC. As parts are getting worn out and harder to find, I seem to be getting busier in my old age.