| [GMCnet] Trip Report (in segments). [message #343156] |
Tue, 07 May 2019 12:34  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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That was our experience, too, Todd. We had the Manny six wheel disk with one ton front end under the 78 Royale and bone stock suspension and brakes under the 77/94 Clasco. Both worked equally as well under all the conditions we encountered except the six wheel disk set up had no functioning parking brake. Both had aluminum 16” wheels (Alcoa on the Royale and Weld on the Clasco) and both had the same tires. Both were at proper ride height all the time and aligned the same. Both were one hand on the wheel drivers and we put around 10K miles a year on each. Knowing what I know now I would keep the stock brakes, have them rebuilt by a really good brake specialist and have one of our quality vendors add grease fittings to the front wheel bearings with re-machined hubs and knuckles. The jury is still out for me as far as the rear suspension is concerned. Both of ours retained the stock one air bag per side set up with a wireless air pressure controller. I probably would now add the quad bag set up just for the limp out of danger facility in the event one wheel or bearing went south.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 3
Date: Mon, 6 May 2019 18:32:14 -0700
From: Todd Sullivan
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Trip Report (in segments).
Message-ID:
Content-Type: text/plain; charset="UTF-8"
I?ve had two gmc coaches. Both 77s. One with six disc and one stock
configuration. The stock braked coach had better pedal feel and braking
power/ response. It is likely that the pedal and response on the all disc
system was due to the integration (or lack thereof ) of the modified system
but that does not really change the arguememt. The stock brake system in
proper condition is plenty adequate. I am always towing something and
frequent the cascade mountain range.
My 2c
Sully
Bellevue. Wa
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Trip Report (in segments). [message #343159 is a reply to message #343156] |
Tue, 07 May 2019 14:51  |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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I suspect the issues of higher pedal effort with the rear disk brakes has
more to do with a large master cylinder than with the brakes at the wheels.
People use the P30 master cylinder to get the larger reservoir, to prevent
any likelihood of running out of fluid as the pads wear. But it also has a
bigger piston.
Bigger brakes don’t reduce pedal effort even when they improve stopping
power. It’s important not to confuse those two attributes, it seems to me.
Adding a couple of inches to the front brakes increases stopping power, and
rear disks add modulation capability. But drums have a servo effect that
reduces pedal effort, and the P30 has a bigger piston and that increases
pedal effort. So, we get better brakes, but with a higher pedal effort.
Seems to me what we need is the stock piston size with a larger reservoir.
I will continue to use the stock master cylinder. It means I have to check
my brake fluid routinely, but then I do that anyway.
I haven’t installed my kit yet (June, probably), but it certainly came with
two parking-brake-equipped calipers, and Karen wrote a whole section on how
to modify the cables to work with them.
http://www.machinesoflovinggrace.net/gmc/brakes/
Rick “who will eventually install a sensitized booster for routine stop
feel” Denney
On Tue, May 7, 2019 at 1:34 PM Gerald Work via Gmclist <
gmclist@list.gmcnet.org> wrote:
> That was our experience, too, Todd. We had the Manny six wheel disk with
> one ton front end under the 78 Royale and bone stock suspension and brakes
> under the 77/94 Clasco. Both worked equally as well under all the
> conditions we encountered except the six wheel disk set up had no
> functioning parking brake. Both had aluminum 16” wheels (Alcoa on the
> Royale and Weld on the Clasco) and both had the same tires. Both were at
> proper ride height all the time and aligned the same. Both were one hand
> on the wheel drivers and we put around 10K miles a year on each. Knowing
> what I know now I would keep the stock brakes, have them rebuilt by a
> really good brake specialist and have one of our quality vendors add grease
> fittings to the front wheel bearings with re-machined hubs and knuckles.
> The jury is still out for me as far as the rear suspension is concerned.
> Both of ours retained the stock one air bag per side set up with a wireless
> air pressure controller. I probably would now add the quad bag set up just
> for the limp out of danger facility in the event one wheel or bearing went
> south.
>
> Jerry
> Jerry Work
> The Dovetail Joint
> Fine furniture designed and hand crafted in the 1907 former Masonic Temple
> building in historic Kerby, OR
>
> glwork@mac.com
> http://jerrywork.com
>
> ==================
>
> Message: 3
> Date: Mon, 6 May 2019 18:32:14 -0700
> From: Todd Sullivan
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Trip Report (in segments).
> Message-ID:
> m9wpozGHZZsByD2A@mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> I?ve had two gmc coaches. Both 77s. One with six disc and one stock
> configuration. The stock braked coach had better pedal feel and braking
> power/ response. It is likely that the pedal and response on the all disc
> system was due to the integration (or lack thereof ) of the modified system
> but that does not really change the arguememt. The stock brake system in
> proper condition is plenty adequate. I am always towing something and
> frequent the cascade mountain range.
>
> My 2c
>
> Sully
> Bellevue. Wa
>
> ==================
>
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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