Jake Break Question???

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  #11  
Old 05-15-2010, 11:48 PM
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Originally Posted by heavyhaulerss
I was told that with my 1.4 mil miles, the reason my pistons looked good was because I have no jake & if I did, my pistons would be in worse shape if not needed replacement sooner.
Having been involved in rebuilding, I believe someone was pulling your leg.
 
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  #12  
Old 05-16-2010, 02:09 PM
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Originally Posted by geeshock
I know I don't have to wory about you g but to others, even with the jakes, use the corect gear and have that foot ready to stomp that brake if you have to. I've had a few trucks where the jakes didn't engage. Once comming down cabage and once on fancy gap. That could have been interesting if I didn't have it in the right gear, lol

A jake won't do you much good coming off a steep grade unless you are in a lower gear. Ideally, you should have it is a low gear which should require little or no need for your brakes. Some people don't have the patience to come off a mountain that slowly. Before jakes we were forced to come off mountains very slowly. If not then you could find yourself running off a cliff. :eek2:
 
  #13  
Old 05-17-2010, 12:23 PM
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Originally Posted by geeshock
I know I don't have to wory about you g but to others, even with the jakes, use the corect gear and have that foot ready to stomp that brake if you have to. I've had a few trucks where the jakes didn't engage. Once comming down cabage and once on fancy gap. That could have been interesting if I didn't have it in the right gear, lol
I've had that happen too. I also have driven trucks that never had a Jake. One truck, the shifting linkage let go, and I didn't even have the engine on the way down. When going down a grade, make sure you have the right speed and the right gear before you start going down.
 
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  #14  
Old 05-21-2010, 08:41 AM
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Default Jake not cutting out during gear shifts

Different question, but I am having problems with my Jake during gear shifts. I generally double clutch all my shifts cause I have never figure out how to float the gears with the Jake on(It messes up my timing and I miss or grind the gears). Anyhow, recently, after I have pushed in the clutch pedal, shift to neutral, and let up the pedal some to sync the engine speed to gears, the Jake kicks in. Of course, this screws up my shift!! I don't let up all the way on the clutch pedal; just enough to re-engage the clutch. I have a 13-speed transmission and this even happens when I am splitting gears(I don't use the clutch pedal between direct and overdrive).

I wrote this issue up the other day when the truck went into the company shop. The mechanic twice asked me to describe the problem. I got the impression from him that I didn't know what I was talking about or I didn't know how to operate the equipment(I have driven this truck for more than 2 years and 270,000 miles). He did adjust the free play in the clutch which wasn't needed, but it didn't change the current problem at all.

It is my understand that the Jake should NOT kick in at all if my foot is on the clutch pedal. I am thinking that there is microswitch in pedal that is out of adjust or failing(ed).

Any ideas to help me get the company to fix this problem?
 
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Old 05-23-2010, 08:15 PM
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Originally Posted by danske
... I have never figure out how to float the gears with the Jake on(It messes up my timing and I miss or grind the gears)...
Don't use the clutch at all, and instead just keep tension on the fuel pedal. There is a point where if you keep just enough pressure on the pedal, the throttle will be zero and the Jake will not engage either. It takes a little practice, but once you get the hang of it, it makes life a lot easier.

And for those who might be tempted to turn this discussion into a dissertation on how double clutching is vital and floating is bad (I KNOW it is coming because it has on other posts about shifting), my last truck had nearly a million miles on it when it was stolen and had never had ANY transmission or clutch repairs (save two clutch adjustments and two tranny fluid changes), and had never been double clutched.
 
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  #16  
Old 05-23-2010, 09:15 PM
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Originally Posted by Musicman
Don't use the clutch at all, and instead just keep tension on the fuel pedal. There is a point where if you keep just enough pressure on the pedal, the throttle will be zero and the Jake will not engage either. It takes a little practice, but once you get the hang of it, it makes life a lot easier.

And for those who might be tempted to turn this discussion into a dissertation on how double clutching is vital and floating is bad (I KNOW it is coming because it has on other posts about shifting), my last truck had nearly a million miles on it when it was stolen and had never had ANY transmission or clutch repairs (save two clutch adjustments and two tranny fluid changes), and had never been double clutched.
I don't usually use the clutch for shifting, and I've never f'ed up a transmission yet. I'm gettin' on toward 40 years of doing this sh*t.

The first time I drive a particular truck, I'll use the clutch til I get the feel of the truck, then no more clutch once I'm comfortable with the truck.

Any of you guys with electronic Cat motors, they can be programmed so that the Jake doesn't come on until the foot brake is applied whenever the cruise on/off switch is in the on position. The cruise doesnt need to be engaged, just the on/off switch in the on position. The Cat motors where I work are set that way.

.
 
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  #17  
Old 05-23-2010, 09:17 PM
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Originally Posted by GMAN
A jake won't do you much good coming off a steep grade unless you are in a lower gear. Ideally, you should have it is a low gear which should require little or no need for your brakes. Some people don't have the patience to come off a mountain that slowly. Before jakes we were forced to come off mountains very slowly. If not then you could find yourself running off a cliff. :eek2:
In truck driving school our instructors told us to use the same gear coming down a grade as we do coming up or maybe one gear lower. Is that the norm?
 
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  #18  
Old 05-23-2010, 10:20 PM
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Originally Posted by Midnight Flyer
In truck driving school our instructors told us to use the same gear coming down a grade as we do coming up or maybe one gear lower. Is that the norm?
The standard has always been one gear lower than the gear you ascended the grade in. I think they even ask that question on the FL and IL CDL tests, if I remember correctly.
 
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  #19  
Old 05-24-2010, 06:37 PM
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Originally Posted by Midnight Flyer
In truck driving school our instructors told us to use the same gear coming down a grade as we do coming up or maybe one gear lower. Is that the norm?
It depends on how big your motor is.
If you got the motor, you shouldn't have to touch the stick.
 
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  #20  
Old 05-27-2010, 03:44 AM
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11 liter detroit 10 speed eaton, there's three pedals down there but that one on the left.....I don't know what it does!
Coming down a hill with the same gear I go up in and the jake on #3
The only pass I've had trouble was hwy 14 Lovell to I-90 79,900lbs and smoke signals all the way down.
 



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