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Drum Brake Shoe Arcing #4680776
02/28/18 05:14 PM
02/28/18 05:14 PM
Joined: Oct 2006
Posts: 429
Florida, USA
vintageant Offline OP
vintageant  Offline OP
Joined: Oct 2006
Posts: 429
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
Re: Drum Brake Shoe Arcing [Re: vintageant] #4680795
02/28/18 05:42 PM
02/28/18 05:42 PM
Joined: Nov 2006
Posts: 19,898
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,898
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: Drum Brake Shoe Arcing [Re: vintageant] #4680839
02/28/18 06:39 PM
02/28/18 06:39 PM
Joined: Jul 2013
Posts: 1,668
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,668
Ottumwa, Iowa
Lost art.

Imagine doing that when the pads were asbestos.


Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: Drum Brake Shoe Arcing [Re: vintageant] #4680872
02/28/18 07:02 PM
02/28/18 07:02 PM
Joined: Jul 2008
Posts: 1,090
British Columbia, Canada
ecotourist Offline
ecotourist  Offline
Joined: Jul 2008
Posts: 1,090
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.


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT
Re: Drum Brake Shoe Arcing [Re: vintageant] #4680887
02/28/18 07:20 PM
02/28/18 07:20 PM
Joined: Sep 2013
Posts: 10,441
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,441
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.

Last edited by dlundblad; 02/28/18 07:21 PM.

03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Drum Brake Shoe Arcing [Re: vintageant] #4680955
02/28/18 08:24 PM
02/28/18 08:24 PM
Joined: May 2010
Posts: 9,044
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,044
North Carolina
I would not want to breath anywhere near that!


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Drum Brake Shoe Arcing [Re: vintageant] #4680996
02/28/18 09:33 PM
02/28/18 09:33 PM
Joined: Mar 2008
Posts: 6,799
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,799
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

Re: Drum Brake Shoe Arcing [Re: vintageant] #4680999
02/28/18 09:35 PM
02/28/18 09:35 PM
Joined: Jun 2002
Posts: 6,348
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,348
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?

Re: Drum Brake Shoe Arcing [Re: vintageant] #4681041
02/28/18 10:20 PM
02/28/18 10:20 PM
Joined: Oct 2006
Posts: 429
Florida, USA
vintageant Offline OP
vintageant  Offline OP
Joined: Oct 2006
Posts: 429
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
Re: Drum Brake Shoe Arcing [Re: vintageant] #4681136
03/01/18 12:49 AM
03/01/18 12:49 AM
Joined: Oct 2005
Posts: 4,337
Kansas
Kruse Offline
Kruse  Offline
Joined: Oct 2005
Posts: 4,337
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.

Re: Drum Brake Shoe Arcing [Re: vintageant] #4681447
03/01/18 12:34 PM
03/01/18 12:34 PM
Joined: Feb 2014
Posts: 593
Margate England
Claud Offline
Claud  Offline
Joined: Feb 2014
Posts: 593
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.

Last edited by Claud; 03/01/18 12:35 PM.
Re: Drum Brake Shoe Arcing [Re: slacktide_bitog] #4683354
03/03/18 05:26 PM
03/03/18 05:26 PM
Joined: Jul 2008
Posts: 1,090
British Columbia, Canada
ecotourist Offline
ecotourist  Offline
Joined: Jul 2008
Posts: 1,090
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.


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT

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