Home » Public Forums » GMCnet » [GMCnet] Drum Brake Self Adjusters
| [GMCnet] Drum Brake Self Adjusters [message #79892] |
Fri, 09 April 2010 11:32  |
kenneth hugelier
Messages: 89
Registered: August 2008
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I have to get into my stock rear drum brakes to replace the wheel cylinders, and I was wondering if there is a consensus on whether to leave the self adjusters there or remove them. I have been into one wheel last fall and it was clean and except for a broken spring, in good shape.
I don't think I back up enough under normal driving conditions to really adjust the brakes.
Opinions?
ken hugelier
77 PB Det. Mich.
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| Re: [GMCnet] Drum Brake Self Adjusters [message #79893 is a reply to message #79892] |
Fri, 09 April 2010 11:37  |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
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It's true that there probably isn't enough backing while braking to activate
the adjusters under normal operating conditions. But occasional backing
while braking specifically to activate adjusters seems far simpler than
manually adjusting.
On Fri, Apr 9, 2010 at 9:32 AM, ken hugelier <kahugelier@sbcglobal.net>wrote:
> I have to get into my stock rear drum brakes to replace the wheel
> cylinders, and I was wondering if there is a consensus on whether to leave
> the self adjusters there or remove them. I have been into one wheel last
> fall and it was clean and except for a broken spring, in good shape.
> I don't think I back up enough under normal driving conditions to really
> adjust the brakes.
> Opinions?
>
> ken hugelier
> 77 PB Det. Mich.
> _______________________________________________
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Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] Drum Brake Self Adjusters [message #79960 is a reply to message #79895] |
Fri, 09 April 2010 23:05 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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I'm with Emery and Glen, In our shop we will never remove the self adjusters.
One shop removed mine many years ago and was not advised of the change.
If you back up and apply the brakes hard few times before or after a
trip,it will remain functioning.
If your a serious do it yourself type of a guy, you can adjust it
manually, but don't pull off the self adjusters
.
On Fri, Apr 9, 2010 at 9:49 AM, Emery Stora <emerystora@mac.com> wrote:
>
> On Apr 9, 2010, at 10:32 AM, ken hugelier wrote:
>
>> I have to get into my stock rear drum brakes to replace the wheel
>> cylinders, and I was wondering if there is a consensus on whether to
>> leave the self adjusters there or remove them. I have been into one
>> wheel last fall and it was clean and except for a broken spring, in
>> good shape.
>> I don't think I back up enough under normal driving conditions to
>> really adjust the brakes.
>> Opinions?
>>
>> ken hugelier
>> 77 PB Â Det. Mich.
>
>
> Prior to my putting on disk brakes in the rear I would find an empty
> parking lot (usually on Sundays) and I would start on one end and back
> up going at least 10 mph in reverse and step on the brakes. Â I would
> do this at least 20 or more times and when I was done I would have
> much better rear braking. Â I would do this at least every 3 months.
>
> The self adjusters seen to work well on the GMC. Â The only problem is
> that people don't back up much with a motorhome.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
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www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Drum Brake Self Adjusters [message #79964 is a reply to message #79961] |
Sat, 10 April 2010 00:05 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Dan,
If I were you I would do some back ups and hard stops whenever I camped at
Wal-Mart!
They usually have a reasonably sized parking lot and after closing there
aren't a lot of cars around!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dan Gregg
Sent: Saturday, 10 April 2010 2:30 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Drum Brake Self Adjusters
Good idea. I have a school with a large parking lot only one block away. I
am going to take the GMC down there on a Sunday afternoon and back across
the parking lot to get mine adjusted. As many of you recall, I had trouble
with my rear's being out of adjustment back in the winter. This might
prevent that from happening again, as I rarely back the GMC.
Dan
--
Dan & Teri Gregg
danandteri.blogspot.com
///Halon Automatic Fire Extinguishers
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Drum Brake Self Adjusters [message #79973 is a reply to message #79961] |
Sat, 10 April 2010 00:56 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| WD0AFQ wrote on Fri, 09 April 2010 21:30 |
Good idea. I have a school with a large parking lot only one block away. I am going to take the GMC down there on a Sunday afternoon and back across the parking lot to get mine adjusted. ...
|
I like the idea of doing it before or after each trip.
In fact, it would be good to do it just before dumping the waste tanks before storage... stir that tank up and then dump it. (I used to just do figure 8's.)
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Drum Brake Self Adjusters [message #80033 is a reply to message #79991] |
Sat, 10 April 2010 15:34 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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I like to steer the black tank that way and adjust.
Forgot, I no longer have drums so I do not need to adjust anymore.
.
On Sat, Apr 10, 2010 at 6:06 AM, Steven Ferguson <botiemad11@gmail.com> wrote:
> I preferred to leave mine installed but whenever I'm under there or
> it's convenient to do, I give them a manual tweak.
>
> On Fri, Apr 9, 2010 at 9:32 AM, ken hugelier <kahugelier@sbcglobal.net> wrote:
>> I have to get into my stock rear drum brakes to replace the wheel cylinders, and I was wondering if there is a consensus on whether to leave the self adjusters there or remove them. I have been into one wheel last fall and it was clean and except for a broken spring, in good shape.
>> I don't think I back up enough under normal driving conditions to really adjust the brakes.
>> Opinions?
>>
>> ken hugelier
>> 77 PB Â Det. Mich.
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Steve Ferguson
> '76 EII
> Sierra Vista, AZ
> Urethane bushing source
> www.bdub.net/ferguson/
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--
Jim Kanomata
Applied/GMC, Fremont,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] Drum Brake Self Adjusters [message #80058 is a reply to message #80053] |
Sat, 10 April 2010 20:38 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Mike,
20 years ago I might have given it a try. Now I just ponder over it
knowing it can't happen.
On Sat, Apr 10, 2010 at 6:10 PM, Mike Miller <m000035@gmail.com> wrote:
>
>
> jimk wrote on Sat, 10 April 2010 13:34
>> I like to steer the black tank that way and adjust.
>> Forgot, I no longer have drums so I do not need to adjust anymore.
>
>
> Nice plug for disk brakes. Â :lol:
>
> With the reaction arms, can you back up and stomp on the brakes hard enough to get the front tires to come off the ground? Â Â :twisted:
> --
> Mike Miller
> `73 26' X Painted D.
> `78 23' Birchaven
> Hillsboro, OR
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,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] Drum Brake Self Adjusters [message #80310 is a reply to message #79892] |
Mon, 12 April 2010 12:42 |
kingd
Messages: 592
Registered: June 2004
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My understanding of "self adjusting" drum brakes, is that it is the alternate braking while going backwards and then braking while going forward that actually adjusts the brakes. The adjustment takes place while braking going backwards, but braking while going forward resets the mechanism. So my understanding is that a large space is not required for alternating back up and going forward. For something like a rear drum brake mini van a praved driveway is long enough. A GMCMH would require more space. I would think 100 or so feet would be plenty. (just don't hit anything LOL)
DAVE KING
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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| Re: [GMCnet] Drum Brake Self Adjusters [message #80348 is a reply to message #80313] |
Mon, 12 April 2010 16:53 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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| emerystora wrote on Mon, 12 April 2010 13:54 |
On Apr 12, 2010, at 11:42 AM, Dave King wrote:
> My understanding of "self adjusting" drum brakes, is that it is the alternate braking while going backwards and then braking while going forward that actually adjusts the brakes. The adjustment takes place while braking going backwards, but braking while going forward resets the mechanism. So my understanding is that a large space is not required for alternating back up and going forward. For something like a rear drum brake mini van a praved driveway is long enough. A GMCMH would require more space. I would think 100 or so feet would be plenty. (just don't hit anything LOL)
>
> DAVE KING
Not quite. When you brake going backwards the lever will turn the adjusting screw. Then a spring pulls the lever back up. It is not necessary to drive forward to "reset" the lever.
That is why I had suggested a long empty parking lot as you can back up and brake and then back up some more and break without having to drive the motorhome forward each time.
Emery Stora
|
I expect it will be no surprise to anyone that Emery is completely correct.
There used to be two adjuster validation tests (back when cars had drum brakes).
The first required the technician to set the brakes up as tight as he dared then back across one of the vehicle yards and pound on the brake peddle at least ten times (make the vehicle hop, but not necessarily stop), then come back in to a lift and measure the brake drag. (If there was much at all - it failed.
The second was much like the first, but the tech would crank the adjuster off at least a full turn (that is a lot if you don't know). Then take the vehicle out to the yard and do a brake test to be sure he still had some. Then, while backing brake twice, to a stop the second time and evaluate the travel (a string tied to the brake peddle). Count how many stops it takes until the travel stops changing.
Some validation tests were profoundly boring.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Drum Brake Self Adjusters [message #80352 is a reply to message #79892] |
Mon, 12 April 2010 17:36 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
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does this adjust all brakes equally? what if one is further out of adjustment; will it come in equal to the others with this process?
Fred V
'77 Royale RB 455
P'cola, Fl
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