| [GMCnet] Disc Brake Park Brake Again [message #240987] |
Sun, 23 February 2014 11:38  |
Thomas Pryor
Messages: 143
Registered: January 2011
Karma:
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Senior Member |
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Your research is spot on. Parking Brakes are to be of Mechanical function
and must be interpreted to NOT ALLOW "Hydraulic Line locks" or Linear
Actuators.
While I was in Fremont California in Late Jan. spent time at APPLIED GMC
fitting up a coach with a Intermediate wheel GMIII caliper and Rear wheel
Drum. Both were fitted with Reaction Arms. Jim K tested the Service
Brakes while I Watched the Rear Wheel action at 45 MPH.
As in the Video for Drum/Drum ALL REAR WHEELS contributed to the stop. e
http://www.youtube.com/watch?v=1peHuX6NpH0&feature=youtu.be
The real surprise was the effectiveness of the rear wheel only Parking
brake. (Thanks ALEX SIRIUM) The Intermediate parking brake cable was
connected to the rear wheels only. The intermediate wheel was abandoned
for parking brake purposes
1. The PB lever fulcrum was extended to its lowest position as the start
point.
2. Utilizing the stock cables and adding inexpensive pulleys to replace
S hooks at the side frame, ALL LASH was removed from the cable system.
3. The Service brakes were then adjusted to allow the rear wheels to
rotate freely.
4. The PB lever fulcrum was then adjusted Upwards until the lever could
no longer be actuated over the "sweet spot" without the help of a 8"
extension. Adjustment was then backed off to achieve actuation without
assistance.
The 26' coach was then road tested again. This time The parking Brake was
activated, transmission placed in Drive and accelerated.
The coach remained stopped until the Tachometer reached 2500 RPM. To
further test the PB, Jim tried to accelerate further to move the coach and
simulate the DRIVE OFF of a Parking Brake engaged situation. When
acceleration ceased the coach stopped in a fashion that could not be
overlooked.
This modification copies the current designs on all Passenger and Trucks
here in North America. All service brakes are disc type and a shoe in
Drum actuated by cable for the Parking Brake. OEM's have been unable to
make an reliable / effective Disc style parking Brake virtually across the
North American fleet.
For Those of you who are looking for an effective, legal / inspection
compliant, and cost effective Parking brake system Consider the Rear Drum
Parking brake only modification. By the Way you will get the improvement on
the DISC/DRUM REACTION ARM SYSTEM.
http://www.appliedgmc.com/prod.itml/icOid/1510
For those of you who already have a reaction arm system fitted with all
wheel discs, I am committed to supplying you a rear drum parking brake
rescue kit if there is any interest. I am sure the the Metic caliper
reaction arm system and the All GM Caliper systems with or without Reaction
arms can be retro fitted and improved.
--
Regards,
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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