| [GMCnet] GMC REAR BRAKE TORQUE REACTION MODIFICATION [message #86296] |
Thu, 27 May 2010 11:22  |
Charles Aulgur
Messages: 78
Registered: March 2006
Karma:
|
Member |
|
|
To: Steve and all the other folks that made all those nice comments
about my GMC rear brake improvement modification.
I am glad to see that we may be making a little progress in helping
people understand how my rear brake modification improves the braking
capability of the GMC. This concept that four of us are now driving
is not something that fell out of the sky one day. I spent many
hours and $ over about three years before I developed the current
configuration. I lost count along the way but the current design
that is being manufactured by Kim K. is around # 33. I started with
the drum brake system using a wooden mockup of the suspension system
to determine how much rotation was required for full travel of the
suspension. I talked to numerous people at GMC rallies about my
concept but the only people that showed any interest was Jim K. and
Manny. They loaned me an actual rear bogie with one suspension arm
and wheel hub which made it much easier then using my GMC. I
developed several methods of attaching to the backing plate but none
to my satisfaction, so I decided to try using disc brakes and ordered
a set from TSM. That is when I started making some progress. Jim
got a little upset because I didn't buy the disc brakes from him but
thing started to show some success and I put the first set of TSM
disc brakes with my original torque reaction system on my mid axle.
I cut a hole in my right side rear fender well and installed my video
camera looking down at the front shock which lines marked so I could
see the suspension motion. My first braking test showed that the mid
axle no longer lifted the rear of the coach. However. I was surprised
that my rear tires still slide and was also surprised that my video
camera also recored sound which was the best indicator of when the
rear tire starts sliding. Running the video frame by frame showed
the rear tire started sliding within a fraction of a second of
applying the brakes, even though it was not being lifted off the
ground. After some thought I realized that rear is pushing down on
the suspension rotation pin which results in it taking weight off
itself as the braking torque increased. That is when I realized the
rear wheel brakes are almost worthless during hard braking as they
take weight of of the tire until the tire locks up and that is when
you get the flat spots on your rear tires as most people have
experienced. The only solution for this condition is to put my
reaction arm on the rear wheels. When it is on both rear wheels you
gain 1/2 of the braking forces that was being wasted in lifting the
coach and you gain the full braking forces on the rear wheels so you
double the amount of braking capability on the rear and you will end
up with full six wheel braking.
Chuck Aulgur
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
