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| Re: [GMCnet] Rear drums [message #347928 is a reply to message #347924] |
Mon, 16 September 2019 11:57   |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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If the knock-outs are in your backing plates, just knock them out. If not,
you will have to either replace the backing plates, or compare yours to
ones with the slots, drill them and finish the slots by hand. There have
been enough disc brake conversions out there that there might be some used
backing plates out there for a reasonable price if $$$ is a problem.
Jim Hupy
Salem, Oregon
On Mon, Sep 16, 2019, 9:45 AM Dean Hanson via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Any suggestions on how to make a tough job easier? I would like to add
> 'holes' in the back of the drums to adjust my rear brakes.
>
> Ideas please.
>
>
>
> Dean C. Hanson 75 Avion coming back to life.
>
> P.O.Box 2096
>
> Fremont, Ca. 94536
>
> (510) 657-9600
>
>
>
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| Re: [GMCnet] Rear drums [message #348003 is a reply to message #347924] |
Tue, 17 September 2019 09:36 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I've never seen a backing plate without removable plugs for the adjuster to fit. However, if yours don't have the holes, xspeak to anyone here who has converted to rear disks.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Rear drums [message #348017 is a reply to message #348003] |
Tue, 17 September 2019 11:00 |
Rich Kinas
Messages: 113
Registered: July 2019
Karma: 1
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Senior Member |
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Correct me if I am wrong but the knock-outs in the backing plates are used
to pull the shoes inward so that drums can be removed once a grove has been
worn into the drum from the shoes. Shoes auto adjust everytime you stop
when backing up. You just have to have them pretty close when you initially
put them on.
Rich
On Tue, Sep 17, 2019 at 10:36 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I've never seen a backing plate without removable plugs for the adjuster
> to fit. However, if yours don't have the holes, xspeak to anyone here who
> has converted to rear disks.
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
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Rich Kinas
1976 Elaganza II
Orlando, FL
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| Re: [GMCnet] Rear drums [message #348018 is a reply to message #348017] |
Tue, 17 September 2019 11:06 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Most people don’t back the GMC enough and also hard enough to adjust them.
When I had drum brakes about once a month or two I used to find a large empty parking lot and get my GMC backing up at 10 mph or more and slam on the brakes. I would repeat this about 10 times and then my braking would really improve.
Emery Stora
> On Sep 17, 2019, at 10:00 AM, Rich Kinas via Gmclist wrote:
>
> Correct me if I am wrong but the knock-outs in the backing plates are used
> to pull the shoes inward so that drums can be removed once a grove has been
> worn into the drum from the shoes. Shoes auto adjust everytime you stop
> when backing up. You just have to have them pretty close when you initially
> put them on.
>
> Rich
>
> On Tue, Sep 17, 2019 at 10:36 AM Johnny Bridges via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> I've never seen a backing plate without removable plugs for the adjuster
>> to fit. However, if yours don't have the holes, xspeak to anyone here who
>> has converted to rear disks.
>>
>> --johnny
>> --
>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>> Braselton, Ga.
>> I forgive them all, save those who hurt the dogs. They must answer to me
>> in hell
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
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| Re: [GMCnet] Rear drums [message #348019 is a reply to message #348017] |
Tue, 17 September 2019 11:14 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Not all coaches were equipped with self adjusters. Nor were they all the
same when it came to those slots. Don't know, and don't care much when
these changes occurred during production. I just look at the backing
plates. If the slots are there, so much the better. If not, I just put some
in.
Jim Hupy
Salem, Oregon
On Tue, Sep 17, 2019, 9:01 AM Rich Kinas via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Correct me if I am wrong but the knock-outs in the backing plates are used
> to pull the shoes inward so that drums can be removed once a grove has been
> worn into the drum from the shoes. Shoes auto adjust everytime you stop
> when backing up. You just have to have them pretty close when you initially
> put them on.
>
> Rich
>
> On Tue, Sep 17, 2019 at 10:36 AM Johnny Bridges via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> I've never seen a backing plate without removable plugs for the adjuster
>> to fit. However, if yours don't have the holes, xspeak to anyone here
> who
>> has converted to rear disks.
>>
>> --johnny
>> --
>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>> Braselton, Ga.
>> I forgive them all, save those who hurt the dogs. They must answer to me
>> in hell
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
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| Re: [GMCnet] Rear drums [message #348020 is a reply to message #348019] |
Tue, 17 September 2019 11:18 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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James, I have never seen a GMC that was not equipped with the self adjusting rear brakes. Has anyone else here ever seen that?
Emery Stora
77 Kingsley
Frederick CO
> On Sep 17, 2019, at 10:14 AM, James Hupy via Gmclist wrote:
>
> Not all coaches were equipped with self adjusters. Nor were they all the
> same when it came to those slots. Don't know, and don't care much when
> these changes occurred during production. I just look at the backing
> plates. If the slots are there, so much the better. If not, I just put some
> in.
> Jim Hupy
> Salem, Oregon
>
> On Tue, Sep 17, 2019, 9:01 AM Rich Kinas via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Correct me if I am wrong but the knock-outs in the backing plates are used
>> to pull the shoes inward so that drums can be removed once a grove has been
>> worn into the drum from the shoes. Shoes auto adjust everytime you stop
>> when backing up. You just have to have them pretty close when you initially
>> put them on.
>>
>> Rich
>>
>> On Tue, Sep 17, 2019 at 10:36 AM Johnny Bridges via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> I've never seen a backing plate without removable plugs for the adjuster
>>> to fit. However, if yours don't have the holes, xspeak to anyone here
>> who
>>> has converted to rear disks.
>>>
>>> --johnny
>>> --
>>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>>> Braselton, Ga.
>>> I forgive them all, save those who hurt the dogs. They must answer to me
>>> in hell
>>>
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
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| Re: [GMCnet] Rear drums [message #348021 is a reply to message #348020] |
Tue, 17 September 2019 11:31 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Like I said, I don't know where or when. I have encountered it more than
once. Don't know if it was early or late in production, and when I
encounter it, I fix it.I have never given it much thought.
Jim Hupy
Salem, Or.
On Tue, Sep 17, 2019, 9:19 AM Emery Stora via Gmclist <
gmclist@list.gmcnet.org> wrote:
> James, I have never seen a GMC that was not equipped with the self
> adjusting rear brakes. Has anyone else here ever seen that?
>
> Emery Stora
> 77 Kingsley
> Frederick CO
>
>> On Sep 17, 2019, at 10:14 AM, James Hupy via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> Not all coaches were equipped with self adjusters. Nor were they all the
>> same when it came to those slots. Don't know, and don't care much when
>> these changes occurred during production. I just look at the backing
>> plates. If the slots are there, so much the better. If not, I just put
> some
>> in.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Tue, Sep 17, 2019, 9:01 AM Rich Kinas via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> Correct me if I am wrong but the knock-outs in the backing plates are
> used
>>> to pull the shoes inward so that drums can be removed once a grove has
> been
>>> worn into the drum from the shoes. Shoes auto adjust everytime you stop
>>> when backing up. You just have to have them pretty close when you
> initially
>>> put them on.
>>>
>>> Rich
>>>
>>> On Tue, Sep 17, 2019 at 10:36 AM Johnny Bridges via Gmclist >> gmclist@list.gmcnet.org> wrote:
>>>
>>>> I've never seen a backing plate without removable plugs for the
> adjuster
>>>> to fit. However, if yours don't have the holes, xspeak to anyone here
>>> who
>>>> has converted to rear disks.
>>>>
>>>> --johnny
>>>> --
>>>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>>>> Braselton, Ga.
>>>> I forgive them all, save those who hurt the dogs. They must answer to
> me
>>>> in hell
>>>>
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
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>
>
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| Re: [GMCnet] Rear drums [message #348078 is a reply to message #347924] |
Wed, 18 September 2019 07:49 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Never saw one. The plates are different.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Rear drums [message #348081 is a reply to message #348078] |
Wed, 18 September 2019 08:43 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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There were GMC shops that were pulling them off and not advising customers
of the mods.
They do work, but one need to do like what Emory mentioned in order to get
max performance .
Lack of use is again the issue.
On Wed, Sep 18, 2019 at 5:50 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Never saw one. The plates are different.
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Rear drums [message #348082 is a reply to message #347924] |
Wed, 18 September 2019 09:15 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Every 60's GM vehicle I have worked on had self adjusting rear drums. Since this was the 70's and GM's flagship vehicle I cannot imagine they did not all come with self adjusting rear drums. I can only think some previous "mechanic" couldn't be bothered with the " complexity" and as a rule, when people don't understand a system, they circumvent it.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Rear drums [message #348085 is a reply to message #348082] |
Wed, 18 September 2019 09:49 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Next time I encounter a GMC motorhome that has NO SLOTS in the backing
plates, I will FOR SURE take pictures and post them on the photo site. I
didn't think that it was that unusual, apparently I was in error.
Jim Hupy
Salem, Oregon
On Wed, Sep 18, 2019, 7:16 AM John R. Lebetski via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Every 60's GM vehicle I have worked on had self adjusting rear drums.
> Since this was the 70's and GM's flagship vehicle I cannot imagine they did
> not
> all come with self adjusting rear drums. I can only think some previous
> "mechanic" couldn't be bothered with the " complexity" and as a rule, when
> people don't understand a system, they circumvent it.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
> _______________________________________________
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| Re: [GMCnet] Rear drums [message #348098 is a reply to message #348085] |
Wed, 18 September 2019 13:43 |
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I had to bust out the slots with a cold chisel in our Palm Beach. Then buy
plugs.
bdub
On Wed, Sep 18, 2019, 9:47 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Next time I encounter a GMC motorhome that has NO SLOTS in the backing
> plates, I will FOR SURE take pictures and post them on the photo site. I
> didn't think that it was that unusual, apparently I was in error.
> Jim Hupy
> Salem, Oregon
>
> On Wed, Sep 18, 2019, 7:16 AM John R. Lebetski via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Every 60's GM vehicle I have worked on had self adjusting rear drums.
>> Since this was the 70's and GM's flagship vehicle I cannot imagine they
> did
>> not
>> all come with self adjusting rear drums. I can only think some previous
>> "mechanic" couldn't be bothered with the " complexity" and as a rule,
> when
>> people don't understand a system, they circumvent it.
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
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bdub
bdub.net
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