Home » Public Forums » GMCnet » re-engineering brakes
| re-engineering brakes [message #148422] |
Tue, 01 November 2011 16:50  |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
|
Senior Member |
|
|
A revcon friend has a blown MC.
The actual part may be hard to find. He wants to avoid the Revcon Guy in San Diego.
Jim Bounds was pessimistic about finding a solution. I assume Jim, as a business, he is reluctant to recomend an alternative for brake parts.
But here's what we know- the rotors are Toronado, the drums are some other big car from that period.
The MC and boost appear IDENTICAL to what's on the GMC.
Revcon turned the linkage so the MC is mounted sideways.
I understand why a shop is not going to mess with inventing a solution but how hard can it be?
I'm fairly certain GMC parts would bolt right in.
If we know the length of the stroke, the volume of the MC, and the volume of the wheel cylinders, what would be the challenge to bolting something else in there?
And if some experiment works and the coach is able to stop, arethere long term unknowns that could bite us?
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
|
|
|
|
| Re: re-engineering brakes [message #148425 is a reply to message #148422] |
Tue, 01 November 2011 17:25  |
GMC Cruse
Messages: 606
Registered: June 2009
Location: SE Michigan
Karma: 3
|
Senior Member |
|
|
| hertfordnc wrote on Tue, 01 November 2011 17:50 |
A revcon friend has a blown MC.
The actual part may be hard to find. He wants to avoid the Revcon Guy in San Diego.
Jim Bounds was pessimistic about finding a solution. I assume Jim, as a business, he is reluctant to recomend an alternative for brake parts.
But here's what we know- the rotors are Toronado, the drums are some other big car from that period.
The MC and boost appear IDENTICAL to what's on the GMC.
Revcon turned the linkage so the MC is mounted sideways.
I understand why a shop is not going to mess with inventing a solution but how hard can it be?
I'm fairly certain GMC parts would bolt right in.
If we know the length of the stroke, the volume of the MC, and the volume of the wheel cylinders, what would be the challenge to bolting something else in there?
And if some experiment works and the coach is able to stop, arethere long term unknowns that could bite us?
|
If you can get a casting # off the master cylinder, I may be able to give you some info on it. I have an EIS Brake Parts book thru 1981 that has casting #'s, part #, and what it fits.
Mike K.
'75 PB
Southeast Michigan
|
|
|
|
| Re: [GMCnet] re-engineering brakes [message #148430 is a reply to message #148422] |
Tue, 01 November 2011 18:04 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Dave,
Tell your friend to go to a Napa store and ask for a P2085.
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=NMBP2085_0306745208
That's what's used in a GMC.
He can disassemble them both and compare the innards.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of dave silva
A revcon friend has a blown MC.
The actual part may be hard to find. He wants to avoid the Revcon Guy in San Diego.
Jim Bounds was pessimistic about finding a solution. I assume Jim, as a business, he is reluctant to recomend an alternative for
brake parts.
But here's what we know- the rotors are Toronado, the drums are some other big car from that period.
The MC and boost appear IDENTICAL to what's on the GMC.
Revcon turned the linkage so the MC is mounted sideways.
I understand why a shop is not going to mess with inventing a solution but how hard can it be?
I'm fairly certain GMC parts would bolt right in.
If we know the length of the stroke, the volume of the MC, and the volume of the wheel cylinders, what would be the challenge to
bolting something else in there?
And if some experiment works and the coach is able to stop, arethere long term unknowns that could bite us?
--
Dave & Ellen Silva
1972 Revcon Olds 455, toro drive train. All Stock
_______________________________________________
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
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] re-engineering brakes [message #148449 is a reply to message #148422] |
Tue, 01 November 2011 19:16 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Dave, take a look at several brands of step van. We had a one ton dually which was set up that way, it was either a GMC or a Chevrolet. Booster and master cylinder on a bracket at right angles to the pedal rod, and a big belcrank on the mount. I >think< Union City Body Company built the thing, they're in Indiana. If that's not correct, send me an email, I'll be back in the office Thursday and I can call the guy who replaced me in that job. I think they still have the truck.
--johnny
________________________________
From: dave silva <admin@oldrv.net>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, November 1, 2011 5:50 PM
Subject: [GMCnet] re-engineering brakes
A revcon friend has a blown MC.
The actual part may be hard to find. He wants to avoid the Revcon Guy in San Diego.
Jim Bounds was pessimistic about finding a solution. I assume Jim, as a business, he is reluctant to recomend an alternative for brake parts.
But here's what we know- the rotors are Toronado, the drums are some other big car from that period.
The MC and boost appear IDENTICAL to what's on the GMC.
Revcon turned the linkage so the MC is mounted sideways.
I understand why a shop is not going to mess with inventing a solution but how hard can it be?
I'm fairly certain GMC parts would bolt right in.
If we know the length of the stroke, the volume of the MC, and the volume of the wheel cylinders, what would be the challenge to bolting something else in there?
And if some experiment works and the coach is able to stop, arethere long term unknowns that could bite us?
--
Dave & Ellen Silva
1972 Revcon Olds 455, toro drive train. All Stock
_______________________________________________
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
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
|
|
|
|
| Re: [GMCnet] re-engineering brakes [message #148453 is a reply to message #148422] |
Tue, 01 November 2011 19:33 |
 |
ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
|
Senior Member |
|
|
Go for it. Some have replaced their master cylinders with P-30 units, or powermaster units out of Buick's. I found an abandoned wire under my dash that said Powermaster, so it's clear that my beloved PO tried it and at some point switched back to a regular master cylinder.
Now I'm confused. Is the powermaster the electrically boosted master cylinder, or is that the one that uses the power steering pump?
Larry Davick
Fremont, California
The Mystery Machine
'76 (ish) Palm Beach
----- Original Message -----
From: "dave silva" <admin@oldrv.net>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, November 1, 2011 2:50:56 PM
Subject: [GMCnet] re-engineering brakes
A revcon friend has a blown MC.
The actual part may be hard to find. He wants to avoid the Revcon Guy in San Diego.
Jim Bounds was pessimistic about finding a solution. I assume Jim, as a business, he is reluctant to recomend an alternative for brake parts.
But here's what we know- the rotors are Toronado, the drums are some other big car from that period.
The MC and boost appear IDENTICAL to what's on the GMC.
Revcon turned the linkage so the MC is mounted sideways.
I understand why a shop is not going to mess with inventing a solution but how hard can it be?
I'm fairly certain GMC parts would bolt right in.
If we know the length of the stroke, the volume of the MC, and the volume of the wheel cylinders, what would be the challenge to bolting something else in there?
And if some experiment works and the coach is able to stop, arethere long term unknowns that could bite us?
--
Dave & Ellen Silva
1972 Revcon Olds 455, toro drive train. All Stock
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
|
|
|
|
| Re: [GMCnet] re-engineering brakes [message #148461 is a reply to message #148453] |
Tue, 01 November 2011 20:49 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
|
Senior Member |
|
|
Larry,
Powermaster is the electric power unit. Hydroboost is powered by
the PS pump.
Gary Kosier
77EII & 77PB
Newark, Ohio
----- Original Message -----
From: "Larry Davick" <ljdavick@comcast.net>
To: <gmclist@temp.gmcnet.org>
Sent: Tuesday, November 01, 2011 8:33 PM
Subject: Re: [GMCnet] re-engineering brakes
> Go for it. Some have replaced their master cylinders with P-30
> units, or powermaster units out of Buick's. I found an
> abandoned wire under my dash that said Powermaster, so it's
> clear that my beloved PO tried it and at some point switched
> back to a regular master cylinder.
>
> Now I'm confused. Is the powermaster the electrically boosted
> master cylinder, or is that the one that uses the power
> steering pump?
>
>
> Larry Davick
> Fremont, California
> The Mystery Machine
> '76 (ish) Palm Beach
>
> ----- Original Message -----
> From: "dave silva" <admin@oldrv.net>
> To: gmclist@temp.gmcnet.org
> Sent: Tuesday, November 1, 2011 2:50:56 PM
> Subject: [GMCnet] re-engineering brakes
>
>
>
> A revcon friend has a blown MC.
>
> The actual part may be hard to find. He wants to avoid the
> Revcon Guy in San Diego.
>
> Jim Bounds was pessimistic about finding a solution. I assume
> Jim, as a business, he is reluctant to recomend an alternative
> for brake parts.
>
> But here's what we know- the rotors are Toronado, the drums are
> some other big car from that period.
>
> The MC and boost appear IDENTICAL to what's on the GMC.
>
> Revcon turned the linkage so the MC is mounted sideways.
>
> I understand why a shop is not going to mess with inventing a
> solution but how hard can it be?
>
> I'm fairly certain GMC parts would bolt right in.
>
> If we know the length of the stroke, the volume of the MC, and
> the volume of the wheel cylinders, what would be the challenge
> to bolting something else in there?
>
> And if some experiment works and the coach is able to stop,
> arethere long term unknowns that could bite us?
>
>
> --
> Dave & Ellen Silva
>
> 1972 Revcon Olds 455, toro drive train. All Stock
> _______________________________________________
> 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
|
|
|
|
| Re: [GMCnet] re-engineering brakes [message #148463 is a reply to message #148453] |
Tue, 01 November 2011 20:59 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
you can read here
http://www.gmcmotorhome.info/powermaster.html
gene
On Tue, Nov 1, 2011 at 5:33 PM, Larry Davick <ljdavick@comcast.net> wrote:
> Go for it. Some have replaced their master cylinders with P-30 units, or
> powermaster units out of Buick's. I found an abandoned wire under my dash
> that said Powermaster, so it's clear that my beloved PO tried it and at
> some point switched back to a regular master cylinder.
>
> Now I'm confused. Is the powermaster the electrically boosted master
> cylinder, or is that the one that uses the power steering pump?
>
>
> Larry Davick
> Fremont, California
> The Mystery Machine
> '76 (ish) Palm Beach
>
> ----- Original Message -----
> From: "dave silva" <admin@oldrv.net>
> To: gmclist@temp.gmcnet.org
> Sent: Tuesday, November 1, 2011 2:50:56 PM
> Subject: [GMCnet] re-engineering brakes
>
>
>
> A revcon friend has a blown MC.
>
> The actual part may be hard to find. He wants to avoid the Revcon Guy in
> San Diego.
>
> Jim Bounds was pessimistic about finding a solution. I assume Jim, as a
> business, he is reluctant to recomend an alternative for brake parts.
>
> But here's what we know- the rotors are Toronado, the drums are some other
> big car from that period.
>
> The MC and boost appear IDENTICAL to what's on the GMC.
>
> Revcon turned the linkage so the MC is mounted sideways.
>
> I understand why a shop is not going to mess with inventing a solution but
> how hard can it be?
>
> I'm fairly certain GMC parts would bolt right in.
>
> If we know the length of the stroke, the volume of the MC, and the volume
> of the wheel cylinders, what would be the challenge to bolting something
> else in there?
>
> And if some experiment works and the coach is able to stop, arethere long
> term unknowns that could bite us?
>
>
> --
> Dave & Ellen Silva
>
> 1972 Revcon Olds 455, toro drive train. All Stock
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] re-engineering brakes [message #148477 is a reply to message #148422] |
Tue, 01 November 2011 22:02 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
Dave, I think if you compare that right angle bracket for the Revcon MC
mount, that you find it nearly identical to the Chrysler Vans of the 70's
Vintage. I had a 77 Class C MH built on a Dodge Chassis that had an
identical one to the one that you described. The MC looks to be very close
to the GMC as well. Lacking a solution like the MOpar stuff, The MC on your
RevCON could probably be rebuilt, but I can't imagine that if you had the
casting number and piston Dia that a good parts house couldn't match it up
for you. Take the MC off, clean it up, and look for casting numbers. Take
some good digital pix of it and post it to the GMC picture site. I'll bet
someone can tell you what you have.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Tue, Nov 1, 2011 at 2:50 PM, dave silva <admin@oldrv.net> wrote:
>
>
> A revcon friend has a blown MC.
>
> The actual part may be hard to find. He wants to avoid the Revcon Guy in
> San Diego.
>
> Jim Bounds was pessimistic about finding a solution. I assume Jim, as a
> business, he is reluctant to recomend an alternative for brake parts.
>
> But here's what we know- the rotors are Toronado, the drums are some other
> big car from that period.
>
> The MC and boost appear IDENTICAL to what's on the GMC.
>
> Revcon turned the linkage so the MC is mounted sideways.
>
> I understand why a shop is not going to mess with inventing a solution but
> how hard can it be?
>
> I'm fairly certain GMC parts would bolt right in.
>
> If we know the length of the stroke, the volume of the MC, and the volume
> of the wheel cylinders, what would be the challenge to bolting something
> else in there?
>
> And if some experiment works and the coach is able to stop, arethere long
> term unknowns that could bite us?
>
>
> --
> Dave & Ellen Silva
>
> 1972 Revcon Olds 455, toro drive train. All Stock
>
>
> _______________________________________________
> 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
|
|
|
|
Goto Forum:
Current Time: Wed Nov 20 04:22:34 CST 2024
Total time taken to generate the page: 0.01350 seconds
|
GMCforum
Search
Help
Register
Login
Home
