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101RRS
18th December 2020, 08:21 PM
Like older Land Rovers my Haflinger runs a very basic brake system - single line, four drum brakes, no power assistance.

I am wanting to refurbish the brake system and while there are no deep grooves in the brake drums, machining will probably take them below specs.

They are an aluminium drum with what I assume is a pressed in hardened steel liner that the shoes press against. Used drums cost $200-$300 and new are unobtanium if you can find them.

So does anyone know of an Australian business that would be able to refurbish the drums - eg remove the steel liners and put in new ones.

Thanks

Garry

JDNSW
19th December 2020, 05:38 AM
I suspect you might find it easier to find someone who can supply or make oversize shoes and grind them to fit the drums.

But the first step might be to discuss with an old fashioned, long established, brake specialist what can be done.

rick130
19th December 2020, 08:18 AM
Bounce it off Matt at ACT Brakes in Phillip.

He seems to cop a lot of old, weird and wonderful stuff to repair/remanufacture.

bblaze
21st December 2020, 03:37 AM
Kingston Engineering
Smithton
Tas
what they cant do, cant be done
Google for ph no or I can supply
cheers
blaze

TonyC
30th December 2020, 09:39 PM
Hi Garry,
Do they really need to be machined?
If not just get the shoes relined, oversize if needed.
Have you tried Haflinger Technic in Scotland? I've always found then very helpful and their pricing good, and always amazed at the parts they have
Tony

101RRS
31st December 2020, 12:00 AM
Yes the drums do need to be machined and will be below safe wear limits on a couple - for sure if there is no other option I will just use thicker shoes but I need to explore options first like someone must be able to remove the wear surface land press a new one in.

Yes I use Haflinger Technik for all my parts and have bought brake parts before from them.

Cheers

Garry

JDNSW
31st December 2020, 05:57 AM
Thinking about this, I strongly suspect that the steel liner is not pressed in, but the aluminium drum is cast onto the outside of it. This means that "replacing" the liner will be virtually impossible.

If this is the case though, it is almost certainly possible (albeit probably difficult and expensive) to build a completely new drum, using the existing drum as a pattern. You would need to find a foundry that casts aluminium as well as an engineering shop that can make the liner and machine the composite drum. This sort of thing was regularly done in manufacturing in Australia fifty years ago, but I am not certain it is still done. There are certain to be firms that could do it, but whether they want to is probably another matter.

The steel liner could be machined out (not going into the alloy) and a thin liner fitted into it ( shrunk rather than pressed because of the thinness), but whether this would be approved by the engineer I do not know.

And another query - is the liner steel or cast iron? Whichever it is, you would need to stick to the same, especially if not doing all four.

It would be easier, cheaper, and possibly acceptable, to get new drums made completely from steel with a combination of laser cutting and machining.

ramblingboy42
31st December 2020, 10:02 AM
Any good machinist worth his salt could sleeve your drums , regardless of what material is chosen.

In my time I sleeved possibly hundreds of different items , even brake cylinders with stainless sleeves.

Go and talk to an engineering workshop...if they turn , they can do it and it may be cheaper than you think.

101RRS
31st December 2020, 10:43 AM
Any good machinist worth his salt could sleeve your drums , regardless of what material is chosen.

In my time I sleeved possibly hundreds of different items , even brake cylinders with stainless sleeves.

Go and talk to an engineering workshop...if they turn , they can do it and it may be cheaper than you think.

Yes I agree - but I figured there would be at least a couple of specialist brake places that can do it.

If all else fails then I will just have to buy new drums but looking for options first.

Cheers

Garry