Home » Public Forums » GMCnet » [GMCnet] brakes cont.
| [GMCnet] brakes cont. [message #102554] |
Mon, 11 October 2010 11:23  |
Dave Motorhome
Messages: 175
Registered: July 2007
Karma: 2
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Senior Member |
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I left off last week with a very hard brake pedal. taking my full
force to initiate the brakes. so this weekend I began to investigate
the Brake Booster. I could hear a vac leak from behind the master
cylinder, where the push rod comes from the booster to the MC. So i
need a new Booster...
a few questions.
The Leigh Harrison Sensitized brake booster, and GMC vendor
Sensitized brake booster the same? If not one better than the other?
or can i just pick up one from a local parts store?
when removing the booster (arch has a great writeup) do i need to
remove the MC and re-bleed the brakes , or can i leave the lines
attached and "prop up" the MC? (whould bve nice to leave!!)
any other hints would be great! I should be able to try tis next weekend...
--
David Paliotta
75 Glenbrook
Tulsa, OK
http://75glenbrook.googlepages.com/
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| Re: [GMCnet] brakes cont. [message #102572 is a reply to message #102554] |
Mon, 11 October 2010 12:24  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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No, if you do not open the lines on the MC itself, you will not need to
bleed the brakes. The booster can be manipulated out of the opening with
only the minimal amount of adjectives and verbs. the problem is getting to
the booster fasteners from the dash side of the deal. Not impossible, but
having double jointed wrists would be helpful.
Jim Hupy
Salem, Or
78 Royale 403
On Mon, Oct 11, 2010 at 9:23 AM, David <75glenbrook@gmail.com> wrote:
> I left off last week with a very hard brake pedal. taking my full
> force to initiate the brakes. so this weekend I began to investigate
> the Brake Booster. I could hear a vac leak from behind the master
> cylinder, where the push rod comes from the booster to the MC. So i
> need a new Booster...
>
> a few questions.
> The Leigh Harrison Sensitized brake booster, and GMC vendor
> Sensitized brake booster the same? If not one better than the other?
> or can i just pick up one from a local parts store?
>
> when removing the booster (arch has a great writeup) do i need to
> remove the MC and re-bleed the brakes , or can i leave the lines
> attached and "prop up" the MC? (whould bve nice to leave!!)
>
>
> any other hints would be great! I should be able to try tis next weekend...
>
> --
> David Paliotta
> 75 Glenbrook
> Tulsa, OK
> http://75glenbrook.googlepages.com/
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] brakes cont. [message #102588 is a reply to message #102554] |
Mon, 11 October 2010 14:22 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Dave Motorhome wrote on Mon, 11 October 2010 11:23 |
I left off last week with a very hard brake pedal. taking my full
force to initiate the brakes. so this weekend I began to investigate
the Brake Booster. I could hear a vac leak from behind the master
cylinder, where the push rod comes from the booster to the MC. So i
need a new Booster...
a few questions.
The Leigh Harrison Sensitized brake booster, and GMC vendor
Sensitized brake booster the same? If not one better than the other?
or can i just pick up one from a local parts store?
when removing the booster (arch has a great writeup) do i need to
remove the MC and re-bleed the brakes , or can i leave the lines
attached and "prop up" the MC? (whould bve nice to leave!!)
any other hints would be great! I should be able to try tis next weekend...
--
David Paliotta
75 Glenbrook
Tulsa, OK
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I doubt anyone here can give you a comparison between Leigh's and Jim's sensitized brake boosters. Why would anyone try both unless they had trouble with one of them?
I got one from Jim K and installed it.
No, you do not need to disconnect the lines or bleed the system when you are done.
The amount of brake pedal force require is greatly diminished with the new booster and I have great brakes with little pedal effort. It takes less effort than stopping my daily driver vehicles of a Colorado and a Blazer.
I highly recommend Jim K's sensitized booster.
To my knowledge you can not find them in the local autoparts stores. Jim K. has them rebuilt locally to his specs. You need to return the old one for core credit so it can be rebuilt for the next customer.
I can not tell you about Leigh's. I have never tried it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] brakes cont. [message #102591 is a reply to message #102588] |
Mon, 11 October 2010 14:44 |
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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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David,
And I have one from Jim B and "highly recommend" it too!
Now all we need is someone with Lee's to chime in that his is great too and
you'll know EXACTLY which one to buy! NOT! ;-)
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Burton
Sent: Monday, October 11, 2010 2:23 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] brakes cont.
I doubt anyone here can give you a comparison between Leigh's and Jim's
sensitized brake boosters. Why would anyone try both unless they had
trouble with one of them?
I got one from Jim K and installed it.
No, you do not need to disconnect the lines or bleed the system when you are
done.
The amount of brake pedal force require is greatly diminished with the new
booster and I have great brakes with little pedal effort. It takes less
effort than stopping my daily driver vehicles of a Colorado and a Blazer.
I highly recommend Jim K's sensitized booster.
To my knowledge you can not find them in the local autoparts stores. Jim K.
has them rebuilt locally to his specs. You need to return the old one for
core credit so it can be rebuilt for the next customer.
I can not tell you about Leigh's. I have never tried it.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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GMCnet mailing list
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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] brakes cont. [message #102653 is a reply to message #102647] |
Mon, 11 October 2010 22:16 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| WD0AFQ wrote on Mon, 11 October 2010 19:57 |
Ken B. and Carl S. put my Jim K. Sens. Booster on last Jan in Quartzsite. I love the thing.
Dan
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The Continuing Saga of Dan's Brake Booster:
Thanks for giving Ken and me so much credit Dan, but the way I remember it, Ken and I mostly watched while you installed it.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| new booster [message #102660 is a reply to message #102647] |
Mon, 11 October 2010 22:54 |
bukzin
Messages: 840
Registered: April 2004
Location: North California
Karma: 0
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Senior Member |
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| WD0AFQ wrote on Mon, 11 October 2010 19:57 |
Ken B. and Carl S. put my Jim K. Sens. Booster on last Jan in Quartzsite. I love the thing.
Dan
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Dan, I have a stock braking system on my '77 PB
Should I upgrade? Why do you love yours?
Thanks
Bukzin
1977 Palm Beach
[Updated on: Mon, 11 October 2010 22:55] Report message to a moderator |
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| Re: [GMCnet] brakes cont. [message #102726 is a reply to message #102554] |
Tue, 12 October 2010 17:58 |
bobby5832708
Messages: 237
Registered: November 2006
Location: Winter Springs FL
Karma: 3
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Senior Member |
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Jim B's sensitized brake booster made a huge difference in the way my GMC drives.
The standard brake booster requires too much pedal pressure. With the sensitive booster I can generally use my big toe to drive (I'm usually barefoot) as the pedal pressure is like on a modern car. The daily drivers I can compare the GMC to are a late-model Ford Escape or Toyota Avalon and the brake pedal pressure is now comparable, if not slightly more sensitive.
If you've got the original brake booster I would replace it just because it's 30-something years old. The benefit of a lighter pedal is in addition to the added reliability of a new booster. Personally I wasn't going to take a chance of an old booster failing and possibly risking an accident due to inadequate braking power. I replaced it at MY convenience before the old one failed.
Just my opinion!
Bob Heller
2017 Winnebago 29VE
Winter Springs FL
[Updated on: Tue, 12 October 2010 17:59] Report message to a moderator |
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| Re: [GMCnet] brakes cont. [message #102733 is a reply to message #102554] |
Tue, 12 October 2010 18:22 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| Dave Motorhome wrote on Mon, 11 October 2010 09:23 |
So i need a new Booster...
a few questions.
The Leigh Harrison Sensitized brake booster, and GMC vendor
Sensitized brake booster the same? If not one better than the other? ...
|
Sensitized booster is one of the steps in modernizing the GMC.
Other than return shipping, I do not know how much it matters, but from looking at the websites, JimK's (Applied GMC) booster is rebuilt. Leigh's and JimB's (CoOp) both seem to be new units.
<http://www.appliedgmc.com/prod.itml/icOid/612>
<http://www.leighharrisongmcmotorhomeupgrades.com/SensitizedVacuumBooster.html>
<http://gmccoop.com/Box.htm>
When I get that far down my list, I have it in my head that my new booster will come from JimB. Most of my other parts come from JimK.
You do not get this better performance for nothing... As it works on vacuum, make sure you have a vacuum pump when installing a sensitized booster.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| better brakes [message #102744 is a reply to message #102742] |
Tue, 12 October 2010 20:07 |
bukzin
Messages: 840
Registered: April 2004
Location: North California
Karma: 0
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Senior Member |
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Sounds like its first a new vac pump (mine died) and later
the booster. At least for me.
Good info, thanks
Bukzin
1977 Palm Beach
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| Re: [GMCnet] brakes cont. [message #102753 is a reply to message #102733] |
Tue, 12 October 2010 20:34 |
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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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Mike,
AFAIK You do not have to have a remote vacuum pump for the sensitized
booster too work.
IMHO it is a good idea to have one that has two check valves in the bottom
(below the master cylinder) one goes to the engine the other to the vacuum
pump.
If you're REALLY anally retentive you can put a reservoir in line with the
one that goes to the engine!
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Mike Miller
Sent: Tuesday, October 12, 2010 6:22 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] brakes cont.
Dave Motorhome wrote on Mon, 11 October 2010 09:23
> So i need a new Booster...
> a few questions.
> The Leigh Harrison Sensitized brake booster, and GMC vendor
> Sensitized brake booster the same? If not one better than the other? ...
Sensitized booster is one of the steps in modernizing the GMC.
Other than return shipping, I do not know how much it matters, but from
looking at the websites, JimK's (Applied GMC) booster is rebuilt. Leigh's
and JimB's (CoOp) both seem to be new units.
<http://www.appliedgmc.com/prod.itml/icOid/612>
<http://www.leighharrisongmcmotorhomeupgrades.com/SensitizedVacuumBooster.ht
ml>
<http://gmccoop.com/Box.htm>
When I get that far down my list, I have it in my head that my new booster
will come from JimB. Most of my other parts come from JimK.
You do not get this better performance for nothing... As it works on vacuum,
make sure you have a vacuum pump when installing a sensitized booster.
--
Mike Miller
`78 23' Birchaven Rear Bath "The User"
`77 23' Birchaven Side Bath "The Keeper"
`73 26' X Painted D. "The Spare"
Hillsboro, OR
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription 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
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