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#4680776 - 02/28/18 04:14 PM Drum Brake Shoe Arcing
vintageant Offline


Registered: 10/27/06
Posts: 427
Loc: Florida, USA
Who do you know who still does drum brake shoe arcing, as described here:

https://www.youtube.com/watch?v=H-ZF200ZSVs

Can't seem to find anybody in my neck of the woods!
_________________________
1925 Alvis HDEO 15W40
1937 Alvis Speed 25 20W50 w LM MoS2 & LM MOS
1970 VW Peking - Paris Rally Beetle HDEO 15W40 w LM MoS2
1987 Porsche 924S HDEO 15W40

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#4680795 - 02/28/18 04:42 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
Trav Offline


Registered: 11/20/06
Posts: 18904
Loc: MA, Mittelfranken.de
When I first started the garage I worked at had one of those machines along with in the car cylinder boring machine (not just a hone), hand operated commutator lathe, brake rivet machine and a bunch of other machines that are no longer used.
I was fortunate enough to learn how to use them.
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#4680839 - 02/28/18 05:39 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
jhellwig Offline


Registered: 07/01/13
Posts: 1542
Loc: Ottumwa, Iowa
Lost art.

Imagine doing that when the pads were asbestos.
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#4680872 - 02/28/18 06:02 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
ecotourist Offline


Registered: 07/09/08
Posts: 1067
Loc: British Columbia, Canada
Very elegant. When I used to change brake shoes on my '65 Comet I realized the arc wouldn't be ideal but also that the pads would slowly "work in". It braked straight enough with new pads and I took it easy until the pads were fully bedded. It didn't take all that long either as far as I could tell (though I have to admit I didn't take the drums off to check).

Not nearly as elegant as what they show in the video but I suspect it was what most people did in those days. Nowadays it would have to almost everyone because who has an arcing machine anymore?

And yes it would be a real health hazard if you were arching asbestos shoes.
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#4680887 - 02/28/18 06:20 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
dlundblad Offline


Registered: 09/30/13
Posts: 10057
Loc: Indiana
Would this be from junk shoes?

Never wanted to deal with drum brakes. Never wanted to know how to fix them. Then dad bought a classic car... And I bought my truck. They aren't bad really. Wheel cylinders are cheap.

* The narrator sounds like Tony the Tiger.


Edited by dlundblad (02/28/18 06:21 PM)
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#4680955 - 02/28/18 07:24 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
I would not want to breath anywhere near that!
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#4680996 - 02/28/18 08:33 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6177
Loc: USA
Why not just get new shoes? smile

Or, if you're lucky, convert to rear discs, sometimes made easier if they were available on your car

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#4680999 - 02/28/18 08:35 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
doitmyself Offline


Registered: 06/03/02
Posts: 6230
Loc: MI
What's the reason for having to do this? Are the brake shoes malformed? Or is there another reason? For instance, a generic one-size-fits-all shoe that is cut to fit different brake drums?

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#4681041 - 02/28/18 09:20 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
vintageant Offline


Registered: 10/27/06
Posts: 427
Loc: Florida, USA
We're talking about an 81 year old Alvis with cable operated 14" ID drum brakes. Linings need to be 100% concentric inside the drum and have 100% contact to be effective.
_________________________
1925 Alvis HDEO 15W40
1937 Alvis Speed 25 20W50 w LM MoS2 & LM MOS
1970 VW Peking - Paris Rally Beetle HDEO 15W40 w LM MoS2
1987 Porsche 924S HDEO 15W40

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#4681136 - 02/28/18 11:49 PM Re: Drum Brake Shoe Arcing [Re: vintageant]
Kruse Offline


Registered: 10/05/05
Posts: 4296
Loc: Kansas
This machine, along with a bunch of other similar machines of yesteryear, is why mechanics were deaf and died of lung cancer.
I remember a local mechanic who used to have one of these, along with a brake shoe reliner, who did brake jobs.
The rivets on the brake shoes had to be done perfect or the friction material would loosen up and eventually fall off.

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#4681447 - 03/01/18 11:34 AM Re: Drum Brake Shoe Arcing [Re: vintageant]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
Originally Posted By: vintageant
We're talking about an 81 year old Alvis with cable operated 14" ID drum brakes. Linings need to be 100% concentric inside the drum and have 100% contact to be effective.


^^This^^
Good luck finding parts for an Alvis at NAPA. Or an Auburn.
What do you do if need something for a long defunct machine?. You make one.
There was a small engineering shop in my home town that used to do just that. Make a clutch from scratch?, no problem. Water pump broken?, Give us the old one and we'll make one just like it.
Of course the invoice for the time and knowledge were astronomical, but you had a part made or a static museum piece.

Claud.


Edited by Claud (03/01/18 11:35 AM)

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#4683354 - 03/03/18 04:26 PM Re: Drum Brake Shoe Arcing [Re: slacktide_bitog]
ecotourist Offline


Registered: 07/09/08
Posts: 1067
Loc: British Columbia, Canada
Originally Posted By: slacktide_bitog
Why not just get new shoes? smile

I think those are new shoes. They just have a slightly different radius than the drum.

Those drums look new (or were refurbished and machined smooth). There's a small difference in the radius of a worn then machined smooth used drum and a new OEM drum, so even a well made shoe might not mate exactly. And that's what they're correcting. It wasn't too bad when they started, but by the time they were done the fit was exact.

In this litigious day a perfect fit might be important.
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2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT

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