| [GMCnet] REACTION ARM DETAIL DRAWINGS [message #104390] |
Wed, 27 October 2010 11:05  |
Charles Aulgur
Messages: 78
Registered: March 2006
Karma:
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Member |
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Les posted:
Does anyone have any photos of the production reaction arm system
that clearly shows the inter-relation with the swaybar? I've only
seen photos of the versions where the arm connected to the bogie
frame bracket.
Les Burt
Sent from my iPhone
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If you go to the GMC Photo site and search foe Username "chuckieboy"
it will take to my photos. Go to the reaction arm Cad drawings and
you can review several of Rick Flanagan's CAD drawings showing how
all the piece parts fit together. I also have detailed instructions
on how to install the total system on a GMC. Also, there is another
group of my photos that I took when I installed my production system
which has the original reaction arm design that transfer the brake
loads to the bogie frame.
Yesterday I uploaded some photos of the air-operated parking brake
system that I have on my coach. It operates in the same way as when
you apply your OEM parking brakes. When you first start to raise the
parking brake, the micro-switch that makes a ground that turns your
dash parking light also provides a ground for a solenoid valve under
the coach that pressurizes the Monroe air-lift shock that extends and
applies and equal load on the two cables that go to the parking brake
calipers on the rear two wheels. As the air shock extends it rotates
a locking lever (like when you open one of your front hood doors)
into the "locked position. As you continue to raise the OEM parking
brake handle upward, the attached cable follows the motion of the
locking lever and when it reaches the top "locked" position it holds
the locking lever in the locked position and the air supply solenoid
valve is de-energized, venting the air from the air shock. This
parking brake application takes about one second which is
approximately how long it takes you to raise the OEM parking handle.
When the locking lever is moved into the locking position, the micro-
switch that turns off power to the air supply valve also turns on an
indicator light on my dash showing the air operated mechanism is
locked. When you release the OEM parking brake handle the locking
lever is released and a small coil spring compasses the air shock to
it's compressed position. This system applies several hundred pounds
of force to the parking brake handle and will hold my GMC on +8% grade.
There are also photos of a proposed production unit that I made for
Jim and Rick is modeling it on his CAD program. Jim doesn't thing
the concept will sell as two many people do not have "working"
compressors on their GMCs. My though is if they won't sent two or
three hundred $ for a compressor they most likely will not spend 5K$
for the reaction arm system.
Chuck Aulgur
La Mesa, CA
76 Royale with excellent brakes
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