Home » Public Forums » GMCnet » [GMCnet] Getting a dependable park brake. Disc,or not.
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350741 is a reply to message #350740] |
Mon, 16 December 2019 21:35   |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
Karma: 14
|
Senior Member |
|
|
Hal St. Clair uses LAs on his diesel coach.
Care to share your details? I think one LA per side makes sense, but have to figure out how to move the coach if it freezes in the 'on' position.
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
|
|
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350744 is a reply to message #350743] |
Tue, 17 December 2019 08:52 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
My personal opinion is that I like to keep as many things mechanical and
not rely on electrical.
Electrical is great but we have seen lot of basic things that an be done to
improve the parking brake system.
John Bush has shown us his system that works well without muh cash outlay.
We can email the info if requested.
On Tue, Dec 17, 2019 at 6:04 AM Bruce Hislop via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Just about everything you need to know about the GM brakes and parking
> brakes improvements by Al Branscombe. His contact info is at the end of the
> presentation.
>
>
> https://www.gmcmi.com/wp-content/uploads/2013/02/GMCMH_Parking_Brake_Improvements1r5spring2011webr1.pdf
>
> --
> 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
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350751 is a reply to message #350744] |
Tue, 17 December 2019 21:53 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
|
Senior Member |
|
|
I used a singe LA (225 lb, 8"stroke) that pushes and pulls a bell crank. The cables attach to opposite ends of the bell crank so they both pull or relax together when the LA is extended/retracted. You have to be careful with the amount of force applied as the caliper parking brake arm isn't too robust and can be easily bent. I also used pulleys at the frame where the cables pass to reduce the friction. I had thought of making the pressure adjustable by varying the voltage but it seems to work well enough that other 'things' could use my attention 
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
[Updated on: Tue, 17 December 2019 21:58] Report message to a moderator |
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350785 is a reply to message #350740] |
Wed, 18 December 2019 10:47 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
I have yet to use the parking brake on any of the three coaches I've had. I* use 4x4 blocks of treated wood to chock the wheels. Never failed yet.
--johnny
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] Getting a dependable park brake. Disc,or not. [message #350788 is a reply to message #350785] |
Wed, 18 December 2019 11:07 |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
Karma: 14
|
Senior Member |
|
|
We live on an island, so have to take the 5-minute ferry when we leave with the GMC. The waiting line is on a downhill grade, enough that I don't want to put it in park while waiting for up to an hour during busy times. So, I hold my foot on the pedal. Also, sometimes the skipper hits the dock somewhat hard - enough that you can tell which cars have a parking brake set. A working parking brake would be pretty handy.
Anyone know what John Bush's system is?
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350789 is a reply to message #350788] |
Wed, 18 December 2019 11:23 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
Told you people I can send info.
Ask....
On Wed, Dec 18, 2019 at 9:08 AM Bill Van Vlack via Gmclist <
gmclist@list.gmcnet.org> wrote:
> We live on an island, so have to take the 5-minute ferry when we leave
> with the GMC. The waiting line is on a downhill grade, enough that I don't
> want
> to put it in park while waiting for up to an hour during busy times. So, I
> hold my foot on the pedal. Also, sometimes the skipper hits the dock
> somewhat hard - enough that you can tell which cars have a parking brake
> set. A working parking brake would be pretty handy.
>
> Anyone know what John Bush's system is?
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350790 is a reply to message #350789] |
Wed, 18 December 2019 11:35 |
bdub
Messages: 1578
Registered: February 2004
Location: Central Texas
Karma: 5
|
Senior Member |
|
|
Hi Jim
What is John Bushes parking brake system?
bdub
-----Original Message-----
From: Gmclist On Behalf Of Jim Kanomata via Gmclist
Sent: Wednesday, December 18, 2019 11:23 AM
Subject: Re: [GMCnet] Getting a dependable park brake. Disc,or not.
Told you people I can send info.
Ask....
On Wed, Dec 18, 2019 at 9:08 AM Bill Van Vlack via Gmclist <
gmclist@list.gmcnet.org> wrote:
> We live on an island, so have to take the 5-minute ferry when we leave
> with the GMC. The waiting line is on a downhill grade, enough that I don't
> want
> to put it in park while waiting for up to an hour during busy times. So, I
> hold my foot on the pedal. Also, sometimes the skipper hits the dock
> somewhat hard - enough that you can tell which cars have a parking brake
> set. A working parking brake would be pretty handy.
>
> Anyone know what John Bush's system is?
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
bdub
'76 Palm Beach/Central Texas
www.bdub.net
www.gmcmhphotos.com
www.gmcmotorhomemarketplace.com
www.gmcmhregistry.com
www.facebook.com/groups/classicgmcmotorhomes
www.facebook.com/groups/gmcmm
|
|
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350801 is a reply to message #350785] |
Wed, 18 December 2019 15:47 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
|
Senior Member |
|
|
If you are on a slope, and by yourself, and your parking pawl isn’t
engaging, I hope you can run fast.
Rick “BTDT” Denney
On Wed, Dec 18, 2019 at 11:55 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I have yet to use the parking brake on any of the three coaches I've had.
> I* use 4x4 blocks of treated wood to chock the wheels. Never failed yet.
>
> --johnny
> --
> 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
>
>
> _______________________________________________
> 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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350803 is a reply to message #350801] |
Wed, 18 December 2019 16:20 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
Normally, I would advise AGAINST a "line lock" parking brake, but, the GMC
parking brake, as installed, will not hold a GMC coach on the ramp to many
ferry landings that I have been on in Washington State. IF THE DRIVER
REMAINS AT THE WHEEL, this might be one of the very few times that a "line
lock" could be useful. I guess that nothing but death is forever. I still
will not install one of them.
Jim Hupy
Salem, Oregon
On Wed, Dec 18, 2019, 1:47 PM Richard Denney via Gmclist <
gmclist@list.gmcnet.org> wrote:
> If you are on a slope, and by yourself, and your parking pawl isn’t
> engaging, I hope you can run fast.
>
> Rick “BTDT” Denney
>
> On Wed, Dec 18, 2019 at 11:55 AM Johnny Bridges via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> I have yet to use the parking brake on any of the three coaches I've had.
>> I* use 4x4 blocks of treated wood to chock the wheels. Never failed yet.
>>
>> --johnny
>> --
>> 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
>>
>>
>> _______________________________________________
>> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350813 is a reply to message #350740] |
Wed, 18 December 2019 19:08 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
I was really hope that Thomas Pryor Esq. would join in here. And that is mostly for one reason, but I have two.
Prior to the incident in the spring, I did have a completely OE parking brake that would hold the coach on an incline, but I never tested how much incline that might withstand.
We came home from the adventure in South Carolina with the Engine/Transmission about an inch and an half farther forward that it is supposed to be. As a result, Reverse was now drive (I unplugged the backup lights), there was no park to be had at all and the parking brake was nowhere to be found. Fortunately, Mary had decided to run consort in the rental car for the return to Michigan some 982 miles distant. Any time I stopped, I would have to wait for her to stop the car, and come along side to grab the block out of the doorway and put it someplace good. This had to happen any time a stop did not allow me to roll up to something solid.
This was only real bad when the right hood popped on the interstate. It was RAINING (emphasis intended). As you all know, we made it home. I did vow to get the parking brake working after the driveline was put back in place. I do barely have it working now, but it is a planned winter program. I do not want to be without a parking brake again. The thing that we all have to be conscious of here is that there are about eleven common mode failures that will make the transmission park function worthless.
The reason I wanted Tom to stop by is that he reported that he very successfully got the parking brake to work very well by giving up the intermediate brake and just going to the rear. He and I talked about this at some length, but I did not take any notes and his plan may be very workable for many others. It also might work for me, but my first shot will be making it work right. We will see about before spring in Paterson.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
|
|
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350824 is a reply to message #350740] |
Thu, 19 December 2019 06:49 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Since there seems to be unusual interest in parking brakes, I'll describe
the system I mentioned to Bob D. Caution: While highly effective and,
IMHO, a vast improvement over line locks, it IS hydraulic and will NOT
satisfy government requirements for mechanical brakes.
Back in 2007, the EBC Yellow Brake Pads were receiving a lot of publicity.
I wanted to test the claims, so I conducted a sorta scientific test:
http://www.gmcmhphotos.com/photos/g4642-calibrated-brake-tests.html
About 5 years later I was disgusted with all my attempts to make disk
parking calipers effective, and remembered that the 1-1/4" pneumatic
cylinder was still riding around under my right foot and still connected to
the brake pedal with a chain. Having a tiny new Thomas air compressor on
hand, it occurred to me that they could work together. Using those, and a
spare suspension control valve, I rigged a 6-wheel (or 10-wheel when towing
with toad brakes active) parking brake. On the dash there's a Parking
Brake switch. Any time it's turned ON the compressor produces about 120
psi. That pressure applied to the 1-1/4" cylinder results in about a 150
lbf pull on the brake pedal. That's enough to lock up the brakes when
static, or result in a RAPID stop.
If the ignition is ON, turning the Park switch to OFF releases the brakes
by turning the compressor off and valve-dumping the pressure. If the
ignition is OFF, turning the Park switch OFF has no effect, and the
compressor, with a pressure switch in the circuit, runs about every 30
minutes for maybe 3 seconds to correct the tiny leakage still in the
system. I haven't figured out how long the engine battery will last under
that load, but it's a LONG time -- certainly measured in days, probably
weeks. I can get chocks in place before then.
I HAVE tried it in an emergency on what must be one of the steepest hills
in Seattle and it worked perfectly. I've lost all incentive to achieve a
functional "legal" parking brake.
Ken H.
On Mon, Dec 16, 2019 at 6:40 PM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Have rear drum. Middle disc. Thought of air actuated. In a talk with
> Ken Henderson today. He mentioned a lineal actuator. Made some drawings
> this afternoon. Think that I've figured out most of the details. Anyone
> tried something like this?
> Bob Dunahugh
> 4 COPO Yenkos
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
|
|
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350831 is a reply to message #350824] |
Thu, 19 December 2019 09:48 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
|
Senior Member |
|
|
After more thought. And making some diagrams. Over the linier actuator. I keep coming back to my first idea last year. Went I got another Dana compressor. Compressor on/off pleasure switch. Like what's used now with the rear air ride system. Then a small air tank. It's about 5 inches dia. 12 inches long. Then use one air cylinder for each side. This will provide some redundancy in the system. It could be setup to apply the park brake. Every time that the ignition switch is turned off. If desired. This would make sure that you never forgot. This feature could be on an. As required status. I see this system. As never needing any future adjustments. Think that this could be made up as an install kit.
Bob Dunahugh
78 Royale
4 COPO Yenkos
.
________________________________
From: Ken Henderson
Sent: Thursday, December 19, 2019 6:49 AM
To: GMC Mail List
Cc: Bob Dunahugh
Subject: Re: [GMCnet] Getting a dependable park brake. Disc,or not.
Since there seems to be unusual interest in parking brakes, I'll describe the system I mentioned to Bob D. Caution: While highly effective and, IMHO, a vast improvement over line locks, it IS hydraulic and will NOT satisfy government requirements for mechanical brakes.
Back in 2007, the EBC Yellow Brake Pads were receiving a lot of publicity. I wanted to test the claims, so I conducted a sorta scientific test:
http://www.gmcmhphotos.com/photos/g4642-calibrated-brake-tests.html
About 5 years later I was disgusted with all my attempts to make disk parking calipers effective, and remembered that the 1-1/4" pneumatic cylinder was still riding around under my right foot and still connected to the brake pedal with a chain. Having a tiny new Thomas air compressor on hand, it occurred to me that they could work together. Using those, and a spare suspension control valve, I rigged a 6-wheel (or 10-wheel when towing with toad brakes active) parking brake. On the dash there's a Parking Brake switch. Any time it's turned ON the compressor produces about 120 psi. That pressure applied to the 1-1/4" cylinder results in about a 150 lbf pull on the brake pedal. That's enough to lock up the brakes when static, or result in a RAPID stop.
If the ignition is ON, turning the Park switch to OFF releases the brakes by turning the compressor off and valve-dumping the pressure. If the ignition is OFF, turning the Park switch OFF has no effect, and the compressor, with a pressure switch in the circuit, runs about every 30 minutes for maybe 3 seconds to correct the tiny leakage still in the system. I haven't figured out how long the engine battery will last under that load, but it's a LONG time -- certainly measured in days, probably weeks. I can get chocks in place before then.
I HAVE tried it in an emergency on what must be one of the steepest hills in Seattle and it worked perfectly. I've lost all incentive to achieve a functional "legal" parking brake.
Ken H.
On Mon, Dec 16, 2019 at 6:40 PM Bob Dunahugh via Gmclist wrote:
Have rear drum. Middle disc. Thought of air actuated. In a talk with Ken Henderson today. He mentioned a lineal actuator. Made some drawings this afternoon. Think that I've figured out most of the details. Anyone tried something like this?
Bob Dunahugh
4 COPO Yenkos
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] Getting a dependable park brake. Disc,or not. [message #350851 is a reply to message #350831] |
Sat, 21 December 2019 16:49 |
cadelec
Messages: 303
Registered: September 2011
Location: Brisbane Australia
Karma: 1
|
Senior Member |
|
|
Would it be possible to use an air spring out of a truck brake. This would require air pressure to release probably controlled by a electric solenoid . In the event of no air or electricity then the brakes would be applied. This would then be a fail safe system
Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project
|
|
|
|
Goto Forum:
Current Time: Fri Sep 06 11:59:13 CDT 2024
Total time taken to generate the page: 0.14953 seconds
|
GMCforum
Search
Help
Register
Login
Home
