| [GMCnet] Disc/Drum rear wheel tryouts at [message #237916] |
Wed, 29 January 2014 07:47  |
Thomas Pryor
Messages: 143
Registered: January 2011
Karma: 1
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Senior Member |
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Just got back from Sunny & Warm California visiting Applied GMC. I returned
to a much Colder Florida!
Jim K and the Gang were very gracious hosts. His GMC Mechanics were very
knowledgeable and took direction well. If your in the area of Northern CA
area with your coach its a MUST STOP HERE! His inventory of parts can only
be be described as "what a repository" that keeps our coaches and other
Vendors alive! Jim K's operation and his workforce operate on a cost
conscience basis. No frills here or extra cash for give aways as has been
touted by some.
WE INSTALLED THE FIRST REAR DISK/DRUM REACTION ARM BRAKE KIT ON THE APPLIED
GMC TEST COACH.
- The intermediate disc /wheel could always be made to stop rotation
while the rear drum/ wheel never skidded. The recipe: GMIII 80mm
calipers, aggressive yellow pads, stock MC and stock booster, rear drums
used "sticky shoes" not metallic.
-
- A modified rear wheel drum parking brake CABLE was installed to
actuate only the TWO REAR PB'S. The parking brake lever adjustment was
then"optimized". The PB was then engaged while depressing the service
brake pedal. The coach was then put in Drive and accelerated. The coach
did move until the tach exceeded 2500 RPM.
BOTH JIM K AND HIS MECHANICS WERE IMPRESSED WITH THE PERFORMANCE.
More fine tuning on the intermediate disc recipe may be required, but just
think of it, a stable reaction arm suspension, 4 wheel disc brakes and a
legal mechanical parking brake! Just like all of the SUV's and Large
P/U's currently
manufactured today.
WATCH THE APPLIED GMC BRAKE PAGE FOR MORE info and timing.
--
Regards,
Tom Pryor
4188 Limerick Dr
Lake Wales, Fl 33859
Cell 248 470 9186
Living on a waterfront is not a matter of life or death. Its more
important than that.
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| Re: [GMCnet] Disc/Drum rear wheel tryouts at [message #237950 is a reply to message #237932] |
Wed, 29 January 2014 11:28  |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| WD0AFQ wrote on Wed, 29 January 2014 09:15 |
| dfolse75gmc wrote on Wed, 29 January 2014 08:58 |
I keep seeing the term "reaction arm", what is this, a sway bar?
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They look like sway bars but aren't. They are bars that cross the rear of the coach and hold the rear wheels on the ground during hard braking. That is how I explain in a non technical way. I know how well they work as we have the system on our coach, all 4 rear discs. I was one who just could never keep my rear brakes in tip top shape. Now, I never worry about them. I love disc brakes and even have them on my 66 vdub towd. No reaction arm needed on the bug, 
Others will follow with technical information I am sure.
Dan
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The "reaction arm" transfers the rotational force (that tries to force the intermediate wheel down, and the rear wheel up) from the swing arm to the frame. Both wheels thus continue to carry the same weight load while braking, instead of transferring weight to the intermeidiate wheel. In hard braking, you get the full braking capacity of all the rear wheels (instead of just the intermediates). This GREATLY reduces stopping distance in what would otherwise put the rears in a skid.
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| Re: [GMCnet] Disc/Drum rear wheel tryouts at [message #237954 is a reply to message #237931] |
Wed, 29 January 2014 11:52 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| dfolse75gmc wrote on Wed, 29 January 2014 07:58 |
I keep seeing the term "reaction arm", what is this, a sway bar?
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http://www.gmcmhphotos.com/photos/g5368-rear-brake-reaction-arm-system.html
http://www.gmcmhphotos.com/photos/g5481-cad-photos.html
http://www.gmcmhphotos.com/photos/g5831-disc-brakes-chuck-aulgur-reaction-arm-install.html
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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| Re: [GMCnet] Disc/Drum rear wheel tryouts at [message #238013 is a reply to message #237931] |
Wed, 29 January 2014 19:29 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Yup - like they all said. It unbolts the drum from the bogie, and through some linkage, attaches the brake to the frame.
Currently during braking the middle drum pushes against the bogie. This causes the bogie to lift up the coach. The lifted coach can cause the rear tire to loose friction and skid - flat spot on the tire - very bad. Much less effective application of the braking force.
The reaction arm design attaches the rear brakes to plates that are free to move on the bogies, but are attached by levers to the frame. This transfers the braking force to the frame directly for both front and back drums (or disks). It's a much more effective transfer of the braking force.
It took me a very long time to grasp this. Now that I understand it I really want it. I have only to get my girl out of college so I can start lavishing some love on the motorhome!
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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