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| [GMCnet] Booster Replacement [message #326072] |
Thu, 16 November 2017 11:12  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
I am going to be replacing the booster in the Kingsley with one of Dave Lenzi's sensitized boosters. I vaguely remember reading
something about it being a PITA on a coach that does not have the PowerLevel system as the access to the nuts on the cockpit side of
the firewall are impossible to reach. I also remember someone noting that they cut a BIG hole in the lower part of the dashboard to
make the access easier. Can anyone provide any info about where to cut the hole, how big to make the hole, and the tool used to cut
the hole. A photo would be most helpful.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
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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] Booster Replacement [message #326073 is a reply to message #326072] |
Thu, 16 November 2017 11:45  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Rob,
See the following:
http://www.gmcmhphotos.com/photos/bob-dunahugh/p60045-brake-booster-nuts-in-2777-and-2778-gmcs.html
http://www.gmcmhphotos.com/photos/bob-dunahugh/p60044-brake-booster-nuts-in-2777-and-2778-gmcs.html
JR
> On Nov 16, 2017, at 12:12 PM, Rob Mueller wrote:
>
> G'day,
>
> I am going to be replacing the booster in the Kingsley with one of Dave Lenzi's sensitized boosters. I vaguely remember reading
> something about it being a PITA on a coach that does not have the PowerLevel system as the access to the nuts on the cockpit side of
> the firewall are impossible to reach. I also remember someone noting that they cut a BIG hole in the lower part of the dashboard to
> make the access easier. Can anyone provide any info about where to cut the hole, how big to make the hole, and the tool used to cut
> the hole. A photo would be most helpful.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Booster Replacement [message #326074 is a reply to message #326073] |
Thu, 16 November 2017 12:18 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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That is pretty much the same method my neighbor mechanic used to install my Lenzi brake booster a few weeks ago.
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: Gmclist on behalf of John Wright
Sent: Thursday, November 16, 2017 11:45
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Booster Replacement
Rob,
See the following:
https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.gmcmhphotos.com%2Fphotos%2Fbob-dunahugh%2Fp60045-brake-booster-nuts-in-2777-and-2 778-gmcs.html&data=02%7C01%7Ck2gkk%40hotmail.com%7C8d791e367b734d9ae74208d52d19f97c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C63646451193406839 2&sdata=2%2BVyz1XaNuXPvhGu4tSyvzh8wtiz%2BP0J7GehTDYr6OE%3D&reserved=0
https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.gmcmhphotos.com%2Fphotos%2Fbob-dunahugh%2Fp60044-brake-booster-nuts-in-2777-and-2 778-gmcs.html&data=02%7C01%7Ck2gkk%40hotmail.com%7C8d791e367b734d9ae74208d52d19f97c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C63646451193406839 2&sdata=o50wyu3kRzakU8d8gWq6kauJYFcXo4iW3txVxxf2nSU%3D&reserved=0
JR
> On Nov 16, 2017, at 12:12 PM, Rob Mueller wrote:
>
> G'day,
>
> I am going to be replacing the booster in the Kingsley with one of Dave Lenzi's sensitized boosters. I vaguely remember reading
> something about it being a PITA on a coach that does not have the PowerLevel system as the access to the nuts on the cockpit side of
> the firewall are impossible to reach. I also remember someone noting that they cut a BIG hole in the lower part of the dashboard to
> make the access easier. Can anyone provide any info about where to cut the hole, how big to make the hole, and the tool used to cut
> the hole. A photo would be most helpful.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Booster Replacement [message #326081 is a reply to message #326072] |
Thu, 16 November 2017 14:36 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Rob,
I put one of Daves in 6 months ago.
I can come by and help you if you would like.
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: [GMCnet] Booster Replacement [message #326082 is a reply to message #326072] |
Thu, 16 November 2017 15:14 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Some dashes can be flexed, and the correct small hands can get those nuts without cutting.
A thin ratchet wrench is needed. I use a craftsman ratchet wrench.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Booster Replacement [message #326083 is a reply to message #326082] |
Thu, 16 November 2017 15:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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lqqkatjon wrote on Thu, 16 November 2017 15:14Some dashes can be flexed, and the correct small hands can get those nuts without cutting.
A thin ratchet wrench is needed. I use a craftsman ratchet wrench.
I replaced mine quite a few years ado WITHOUT cutting a hole. It was a lot of fun getting in there with just about every small wrench I own but it is possible. I am NOT PowerLevel. Mine is Electro level I
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Booster Replacement [message #326088 is a reply to message #326086] |
Thu, 16 November 2017 19:25 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I haven't had to do that job on a 77+, but, I'd guess that if that
ratcheting box end were one of those with the "broken back", it would make
the task a lot easier -- you can get into 'most anywhere with those.
Ken H.
On Thu, Nov 16, 2017 at 8:11 PM, Gary wrote:
> I know that I had success using a racheting box end wrench and a lot of
> patience.
> I was able to get at from the side and flexing the dash .
> Dave’s sensitized booster has been a big plus for our coach. Especially
> with mountain driving in the west.
>
...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Booster Replacement [message #326089 is a reply to message #326088] |
Thu, 16 November 2017 19:47 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Early coaches with the air knobs in the dash, can be accessed by removing
that panel. Later coaches with the rocker switches to the left side of the
drivers left elbow can be accessed by removing the heater control assembly.
I usually drill a 2" hole in the lower dash with a hole saw in line with
the lower left nut, and reach in with a socket and long extension. Assembly
, I use sticky body sealant (dum dum) putty to stick the nut to the socket.
Jim Hupy
On Nov 16, 2017 5:26 PM, "Ken Henderson" wrote:
> I haven't had to do that job on a 77+, but, I'd guess that if that
> ratcheting box end were one of those with the "broken back", it would make
> the task a lot easier -- you can get into 'most anywhere with those.
>
> Ken H.
>
>
> On Thu, Nov 16, 2017 at 8:11 PM, Gary wrote:
>
>> I know that I had success using a racheting box end wrench and a lot of
>> patience.
>> I was able to get at from the side and flexing the dash .
>> Dave’s sensitized booster has been a big plus for our coach. Especially
>> with mountain driving in the west.
>>
> ...
> _______________________________________________
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| Re: [GMCnet] Booster Replacement [message #326139 is a reply to message #326084] |
Sat, 18 November 2017 08:37 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Emery,
Spot on!
When the M/C in Double Trouble started "playing up" I had Helen push on the brakes with the engine running to see what was going on.
I watched the M/C to see where it was leaking and was surprised to see the booster moving when she pushed the pedal. The brace was
installed; however, the rivnuts in the dash had come out and someone used lag bolts to hold it to the bottom of the dash!
I got some steel rivnuts that look like Molly bolts from McMaster-Carr and installed them in the bottom of the dash. I used epoxy on
them to make sure they wouldn't turn when the bracket retaining bolts were installed.
That was back in 2008 and so far so good.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Emery Stora
Sent: Thursday, November 16, 2017 3:46 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Booster Replacement
Yes, you definitely need the brace. Otherwise you eventually will stress crack the metal where the booster is mounted.
Emery Stora
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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] Booster Replacement [message #326141 is a reply to message #326084] |
Sat, 18 November 2017 09:30 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Emery,
Thanks for confirming my suspicions about the purpose of the booster bracket. I also added flat washers on the firewall mounting bolts to spread the load.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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