Home » Public Forums » GMCnet » [GMCnet] Agressive Braking
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| Re: [GMCnet] Agressive Braking [message #196456 is a reply to message #196446] |
Fri, 25 January 2013 14:31   |
LarryInSanDiego
Messages: 336
Registered: September 2006
Karma: 0
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Senior Member |
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How "convert"able is the reaction arm system cost-wise, say from drum to disc if I so choose at a later time? I'll assume the frame bracketry might remain the same although the link, etc. would be different (budget planning is why).
Thanks.
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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| Re: [GMCnet] Agressive Braking [message #196462 is a reply to message #196461] |
Fri, 25 January 2013 15:49 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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There are reaction arm systems that can be converted to work with disk
brakes, the issues with disks are the same as with drums, the forward bogie
digs in and the rear is lifted by braking forces, the reaction arm counters
this. Rather like shaft drive on a motorcycle, and the reaction arm is like
the BMW Paralever system.
On Fri, Jan 25, 2013 at 1:46 PM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Howard, why would you go back for another system if you just now got the
> reaction arm?
>
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
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Plato seems wrong to me today.
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1973 26' GM outfitted
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| Re: [GMCnet] Agressive Braking [message #196521 is a reply to message #196462] |
Sat, 26 January 2013 15:02 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Well, I read someplace that the rears of a vehicle only supply about 20% of the braking when it's moving fiorward. Does this hold true for the GMC as well? I'd expcet it does. Consequently, I like the idea of the 'reaction arm' which looks a lot like the 'floated' drums on the back of several of the scoots I've owned... again the idea being to beat rear wheel hop and lockup. So long as they're held to the ground, I'll hang with the drums in back. Although I'm saving my pennies for the arm kit. It would have reduce the pucker factor significantly when I lost the front broiakes, I bet.
--johnny
'76 23' transmode norris
'76 palm beach
From: Ronald Pottol <ronaldpottol@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Friday, January 25, 2013 4:49 PM
Subject: Re: [GMCnet] Agressive Braking
There are reaction arm systems that can be converted to work with disk
brakes, the issues with disks are the same as with drums, the forward bogie
digs in and the rear is lifted by braking forces, the reaction arm counters
this. Rather like shaft drive on a motorcycle, and the reaction arm is like
the BMW Paralever system.
On Fri, Jan 25, 2013 at 1:46 PM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Howard, why would you go back for another system if you just now got the
> reaction arm?
>
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Plato seems wrong to me today.
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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] Agressive Braking [message #196524 is a reply to message #196521] |
Sat, 26 January 2013 15:25 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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Ah, depends on the vehicle. A good motorcycle, 0% on a max stop. But the
GMC has just over a third of its weight on the front wheels, and relatively
modest weight transfer due to its length, so I'd bet at least half the max
stop braking is from the rear.
I'd bet disks are better for heat dissipation, perhaps better control under
hard braking, and I don't like the Edwardian clockwork of drum brakes. :-)
Ron
On Jan 26, 2013 1:02 PM, "Johnny Bridges" <jhbridges@ymail.com> wrote:
> Well, I read someplace that the rears of a vehicle only supply about 20%
> of the braking when it's moving fiorward. Does this hold true for the GMC
> as well? I'd expcet it does. Consequently, I like the idea of the
> 'reaction arm' which looks a lot like the 'floated' drums on the back of
> several of the scoots I've owned... again the idea being to beat rear wheel
> hop and lockup. So long as they're held to the ground, I'll hang with the
> drums in back. Although I'm saving my pennies for the arm kit. It would
> have reduce the pucker factor significantly when I lost the front broiakes,
> I bet.
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: Ronald Pottol <ronaldpottol@gmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Friday, January 25, 2013 4:49 PM
> Subject: Re: [GMCnet] Agressive Braking
>
> There are reaction arm systems that can be converted to work with disk
> brakes, the issues with disks are the same as with drums, the forward bogie
> digs in and the rear is lifted by braking forces, the reaction arm counters
> this. Rather like shaft drive on a motorcycle, and the reaction arm is like
> the BMW Paralever system.
>
>
> On Fri, Jan 25, 2013 at 1:46 PM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
> >
> >
> > Howard, why would you go back for another system if you just now got the
> > reaction arm?
> >
> > --
> > Dan & Teri Gregg
> > Dexter, Mo.
> >
> > http://danandteri.blogspot.com/
> >
> >
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Plato seems wrong to me today.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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1973 26' GM outfitted
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| Re: [GMCnet] Agressive Braking [message #196527 is a reply to message #196525] |
Sat, 26 January 2013 15:38 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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My guess would be that getting the "sensitized"
brake booster would also be of great value! That
is the course I intend to puruse.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
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> To: gmclist@temp.gmcnet.org
> From: markbb1@netzero.com
> Date: Sat, 26 Jan 2013 15:32:05 -0600
> Subject: Re: [GMCnet] Agressive Braking
>
> Johnny Bridges wrote on Sat, 26 January 2013 15:02
> > Well, I read someplace that the rears of a vehicle only supply about 20% of the braking when it's moving fiorward. Does this hold true for the GMC as well?...
> No. That figure is for passenger cars with 70 - 80% of the weight on the front wheels. The GMC has close to 70% of the weight on the rears, so you want 70% of the braking done by the rears.
> If the nose doesn't dive in the vehicle, weight is not shifting to the front and no additional brking capacity needs to be designed for the front. With the reaction arm, the GMC does not dip, it squats and stops.
> Having said that, IMHO, you DON'T need disk brakes in the rear. Just get Tom Hampton's wider shoe kit and the reaction arm kit for drum brakes and you're done.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
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