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| Gathering Opinions on 2.5" dia. Eldorado Parkbrake Caliper [message #81369 is a reply to message #81323] |
Wed, 21 April 2010 19:07   |
78 Barbi
Messages: 80
Registered: August 2004
Location: Tiverton, Ontario , Canad...
Karma: -1
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Member |
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Gathering Opinions on 2.5" dia. Eldorado parkbrake Caliper
Many times at rallys over the last 5 years or so I have asked folks what their opinion was regarding the
performance of the large Eldorado caliper. Got many opinions and tried to form some sort of arguement
as to their pros and cons. Well, I'm still looking for people that have had sucess stories about said
caliper. Admittedly if you look at great number of brake upgrade sites you will find the Eldorado caliper
almost exclusively used.
When time permitted I have long planned to build a test bed to test calipers with regards to their park
brake capabilities . I have only had one instance where a chap at a rally proclaimed he had a parkbrake
that he was completely satisfied with. However when I went to his coach to put the tensiometers on his
cables and have him apply the parkbrake under engine load ; he remembered that he had taken the
Eldorado calipers off a couple of weeks before, Good old Bobby Moore , May He Rest in Peace ! , We'll
probably all get that forgetful eventually.
The Eldorado caliper auto adjusts via spring loaded assembly that essentially acts as a ratchet and
adjusts when pad wear dictates, this adjustment only happens when the parkbrake (PB) lever is
actuated and all 9 of the internal adjuster components are performing properly. The Eldorado PB
caliper is a lead screw type caliper and thus its mechanical advantage is a fixed linear relationship
at about 14 to 1. The analytical data that I have collected thus far can be viewed on our photo album at :
http://www.gmcmhphotos.com/photos/showphoto.php?photo=33235&title=parkbrake-caliper-testing&cat=5445
One thing that shines about the Eldorado PB caliper is that it's one of the easiest calipers in existance to
mount and in theory at least , is large enough mechanical force to be used on the GMC , even if a foot
long piece of pipe has to be used on the handle to actuate it. I would like to find , develop , steal , etc. a
PB caliper that would be reliable, robust, sealed as best as possible from the elements and above all that
could be used as an emergency brake. The emergency brake aspect has always been a priority but one
can only accomplish so much braking of any sort with 2 tires, wheels, rotors and calipers. In an emergency
situation one would almost certainly ruin the rotors by warping them. There's only so much heat that 45
pounds of steel can absorb before it changes shape but the cost of a couple of rotors would be cheap if
they performed as required.
Any input that anyone has pro or con would be greatly appreciated and I have more information on our
project as time goes on. By the fall rally I would like to have a prototype PB caliper on 3 separate coaches
to try and assess design flaws, performance, ease of use, and the compatibality with the new reaction rod
system. Thanking you in advance for any info you can lend to " THE CAUSE " and feel free to email me
with any thoughts you might have.
Albert Branscombe
Tiverton, ON
78 - 23 foot Birchaven
branscoa@bmts.com
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| Re: [GMCnet] Gathering Opinions on 2.5" dia. Eldorado Parkbrake Caliper [message #81376 is a reply to message #81369] |
Wed, 21 April 2010 20:17 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Hi Albert
I had so much problem keeping the Eldorado callipers adjusted that I
finally took them off and put on calipers without a parking brake
function.
What I would like to see is a mechanical caliper that could be mounted
onto the same disk with a separate caliper bracket or a bracket that
would take both the hydraulic caliper and a mechanical caliper.
Emery Stora
On Apr 21, 2010, at 6:07 PM, Albert&Sheila Branscombe wrote:
>
>
> Gathering Opinions on 2.5" dia. Eldorado parkbrake Caliper
>
>
> Many times at rallys over the last 5 years or so I have asked folks
> what their opinion was regarding the
> performance of the large Eldorado caliper. Got many opinions and
> tried to form some sort of arguement
> as to their pros and cons. Well, I'm still looking for people that
> have had sucess stories about said
> caliper. Admittedly if you look at great number of brake upgrade
> sites you will find the Eldorado caliper
> almost exclusively used.
>
> When time permitted I have long planned to build a test bed to test
> calipers with regards to their park
> brake capabilities . I have only had one instance where a chap at a
> rally proclaimed he had a parkbrake
> that he was completely satisfied with. However when I went to his
> coach to put the tensiometers on his
> cables and have him apply the parkbrake under engine load ; he
> remembered that he had taken the
> Eldorado calipers off a couple of weeks before, Good old Bobby
> Moore , May He Rest in Peace ! , We'll
> probably all get that forgetful eventually.
>
> The Eldorado caliper auto adjusts via spring loaded assembly that
> essentially acts as a ratchet and
> adjusts when pad wear dictates, this adjustment only happens when
> the parkbrake (PB) lever is
> actuated and all 9 of the internal adjuster components are
> performing properly. The Eldorado PB
> caliper is a lead screw type caliper and thus its mechanical
> advantage is a fixed linear relationship
> at about 14 to 1. The analytical data that I have collected thus far
> can be viewed on our photo album at :
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=33235&title=parkbrake-caliper-testing&cat=5445
>
> One thing that shines about the Eldorado PB caliper is that it's one
> of the easiest calipers in existance to
> mount and in theory at least , is large enough mechanical force to
> be used on the GMC , even if a foot
> long piece of pipe has to be used on the handle to actuate it. I
> would like to find , develop , steal , etc. a
>
> PB caliper that would be reliable, robust, sealed as best as
> possible from the elements and above all that
> could be used as an emergency brake. The emergency brake aspect has
> always been a priority but one
> can only accomplish so much braking of any sort with 2 tires,
> wheels, rotors and calipers. In an emergency
> situation one would almost certainly ruin the rotors by warping
> them. There's only so much heat that 45
> pounds of steel can absorb before it changes shape but the cost of a
> couple of rotors would be cheap if
> they performed as required.
>
> Any input that anyone has pro or con would be greatly appreciated
> and I have more information on our
> project as time goes on. By the fall rally I would like to have a
> prototype PB caliper on 3 separate coaches
> to try and assess design flaws, performance, ease of use, and the
> compatibality with the new reaction rod
> system. Thanking you in advance for any info you can lend to " THE
> CAUSE " and feel free to email me
> with any thoughts you might have.
>
> Albert Branscombe
> Tiverton, ON
> 78 - 23 foot Birchaven
>
> mailto:branscoa@bmts.com
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Emery Stora
77 Kingsley
Santa Fe, NM
_______________________________________________
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| Re: [GMCnet] Gathering Opinions on 2.5" dia. Eldorado ParkbrakeCaliper [message #81414 is a reply to message #81381] |
Thu, 22 April 2010 01:14 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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There is a trick that I learned from Walt Halley on these calipers.
We will be discussing this at Western States next month.
On Wed, Apr 21, 2010 at 6:48 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> Emery,
>
> When I bought Double Trouble it had Caddy calipers all the way round BUT
> whoever installed them cut the tabs that held the cables off the backing
> plates making it impossible to connect the parking brake.
>
> For reasons to lengthy to explain I had to get my cousin in New Jersey to
> register it for me and in NJ you MUST have a parking / emergency brake.
>
> Ken Frey wound up removing the rear disks and fitting drums with a parking
> brake so I could get it registered.
>
> I've kept the Caddy calipers with the parking brake arm in case I ever
> decide to refit them. BTW it was you that made me fully aware of the
> pitfalls attendant to doing so!
>
> 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 Emery Stora
> Sent: Thursday, 22 April 2010 11:18 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Gathering Opinions on 2.5" dia. Eldorado
> ParkbrakeCaliper
>
> Hi Albert
>
> I had so much problem keeping the Eldorado callipers adjusted that I
> finally took them off and put on calipers without a parking brake
> function.
> What I would like to see is a mechanical caliper that could be mounted
> onto the same disk with a separate caliper bracket or a bracket that
> would take both the hydraulic caliper and a mechanical caliper.
>
> Emery Stora
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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