Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Thor Industries Owner's Forum > Damon
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 12-16-2008, 12:56 PM   #1
doc
Senior Member
 
doc's Avatar
 
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 4,113
08 Essence, Freightliner chassis, 425 Cummins

The jake has a two positions that it can be activated in. There is a neutral which is vertical and then can be moved forward or to the rear. Bith activate the brake. I cannot see the difference, but why would there be two positions if both do the same thing? Or is there something I am failing to see?
doc is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 12-16-2008, 12:56 PM   #2
doc
Senior Member
 
doc's Avatar
 
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 4,113
08 Essence, Freightliner chassis, 425 Cummins

The jake has a two positions that it can be activated in. There is a neutral which is vertical and then can be moved forward or to the rear. Bith activate the brake. I cannot see the difference, but why would there be two positions if both do the same thing? Or is there something I am failing to see?
doc is offline   Reply With Quote
Old 12-16-2008, 04:35 PM   #3
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 13,599
Hi Doc,
Dumb question; could this be for a high or low activation of the feature? I've deen this on other coaches.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 12-17-2008, 03:37 AM   #4
doc
Senior Member
 
doc's Avatar
 
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 4,113
I wondered about that. When activated, the Allison shows '2' as the target in both positions. I usually just flip it to the front and it slows us down OK. I guess I just need to call Freightliner and get the lowdown. (It is just easier to ask here ) Thanks for the reply Gary
doc is offline   Reply With Quote
Old 12-17-2008, 05:32 AM   #5
Registered User
 
Join Date: Feb 2008
Posts: 3,607
You have an engine compression brake on the 425 Cummins. The front position should be for the full effect of the brake and the rear position for only half the braking. On a good hill check it out closely. When we got our rig, both positions were set up for only half braking. I had Gaffney check it out, and they reprogrammed it the way it was supposed to be.

They also had the MMDC messed up. It and the speedometer was showing about 4 MPH less than the GPS was showing or than what I was getting by calculating time between mile posts. I guess the calibration guy was out to lunch the day mine was supposed to get checked. They fixed that issue too.

John
Pigman1 is offline   Reply With Quote
Old 12-17-2008, 05:33 PM   #6
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
The two positions are for the two brake "speeds", called High and Low. Mine is wired to two separate switches, one is On/Off and the other High/Low and "High" is actually the lesser amount of braking (go figure!). One engages engine braking on 3 cylinders and the other on 6 cylinders. Both will target the same lower gear (normally 2 but can be programmed for any gear you like).

You won't notice the difference in braking except on long steep grades, probably 5% or more. Then the 6 cylinder braking (the Low position on mine) will slow you noticeably more than the 3 cylinder mode.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
Gary RVRoamer is offline   Reply With Quote
Old 12-18-2008, 03:30 AM   #7
Administrator in Memoriam
 
Route 66's Avatar


 
Newmar Owners Club
Retired Fire Service RVer's
Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">High/Low and "High" is actually the lesser amount of braking (go figure!). </div></BLOCKQUOTE>

Couldn't you swap the wires on the high and low terminals to make the switch work properly?
__________________
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP

Route 66 is offline   Reply With Quote
Old 12-18-2008, 04:57 AM   #8
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Couldn't you swap the wires on the high and low terminals to make the switch work properly? </div></BLOCKQUOTE>

Yes I could and had originally planned to do that, but once I learned which was which, it didn't make any difference. I just think of them in terms of "High gear" or "Low gear"
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
Gary RVRoamer is offline   Reply With Quote
Old 12-18-2008, 06:02 AM   #9
doc
Senior Member
 
doc's Avatar
 
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 4,113
That makes a lot of sense and I should have figured that out.
As soon as this weather gets better I am going to take the coach out and experiment a little to find out which way is the 'high' and 'low'.
Thanks
doc
doc is offline   Reply With Quote
Old 01-01-2009, 03:06 PM   #10
Member
 
Join Date: Nov 2001
Location: Santa Clara,CA. USA
Posts: 95
A class I attended at an FMCA Rally said the tranny shows second gear but in reallity it does not shift down.. Can't immagine it going into a lower gear at 60 MPH.

Don,WIT 70041
DonGee is offline   Reply With Quote
Old 01-02-2009, 05:08 PM   #11
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">the tranny shows second gear but in reallity it does not shift down.. </div></BLOCKQUOTE>


The gear displayed on the Allison panel is the "target gear". The transmission will downshift toward the target gear as engine RPMs permit. It will eventually downshift all the way to the target gear, step by step, if upper gears slow the rig down enough to allow it.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
Gary RVRoamer is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Jake Brake Lights? leavitt Newmar Owner's Forum 13 11-25-2007 04:26 PM
Jake Brake dan&donna Alpine Coach Owner's Forum 6 10-22-2007 05:40 PM
Toad brake with Jake brake Roadking Winnebago Industries Owner's Forum 3 12-18-2006 05:24 AM
Jake Brake Operation Bill Z. Alpine Coach Owner's Forum 8 10-09-2006 10:17 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 07:25 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.