the unnecessary usage of j-brakes, why????

Must be a company safety nanny ? I called a Contractor bud and he said its the first he's ever heard of such?
He has 6-8 of his 15 he ordered for 2010.They all have the top end ISX Cummins.

Not sure of their thinking with such a set up ??I wouldn't stand for it,sounds like "safety" is fixin to cause trouble.

Apology extended,

 

It's not "not", or knot, --- in this case.
I think you meant to type 'naught' instead of "not".
And I disagree that this continuing subject is for naught.
Can we not still learn something here?
We ought not be too hasty to label this thread for naught.

Not for those who believe that three heads are better than two heads. For those with that opinion, and a Cummins engine, for example, Jake, the brake, adds a medium betwixt high and low.
2 - 4 - 6
Kitties are 3 & 6, or 1/2.

Does anybody really know what time it is?
Does anybody really care?



Who sang the song containing those lyrics?:smt034
Now I can't get that song outta my head. :smt104

Hmmmmmmm ----- What I see looks like fuzzy logic.
"Most people"?
Is that a truism?
Or an exaggeration?

If a Big truck truck driver is doin' 25 in a truck stop, was it the Jake or the brakes that accelerated the Big truck to that speed?
Or the Big truck's truck driver's heavy right foot?

How can blaming the equipment be justified if it's not the cause for the speed attained?
It's the Big truck truck driver wasting fuel, not the equipment.
Without input from a driver, movement won't happen. The equipment
is deaf, dumb and blind, incapable of wasting fuel in and of itself.

If you see that "all the time", you might be spending too much time in the wrong truck stops. :smt047
Just a thought I think I thunk worth considering, --- subject to opinion, of course.

Oh MaN!
I love that sound.
Do it again.

Don't fret about wastin' fuel, --- there's plenty more where that fuel came from, and the company pays for the fuel anyway. If the company questions the amount of fuel consumed, just inform them it's the Jake's fault, and the brakes, too.
If the company is really serious about conserving fuel, all they have to do is remove the Jake and disable the fuel wastin' brakes.

The key word there is "you" (just used your brake), indicating it isn't the brakes that are wasting the fuel. It's "you", the driver, or whomever is driving at the time. :smt045

Who does that annoy? :smt108

I knew a driver who used the same technique that you've described.
Although he was advised not to do that, he insisted on doin' that on every mountain grade, every time. That is until he missed a shift, stalled the engine, and darned near crashed while fumbling to restart the engine and tryin' to figure out which gear was still available to put 'er in. By the time he got his thoughts collected, he couldn't match the speedo to the tach, and wound up experiencing Mr. Toad's Wild E Coupon Ride, all the way to the bottom without the aid of the Jake, --- just the service brakes with drums glowin' a pretty red color, now worn completely out and in need of replacing.

As bad as that ride was for him, what embarrassed him most was the driver's seat and the crotch of his pants, both very wet. Also contained within those pants was a load of his excrement. :smt036

His Big truck not only got new brakes, it also got a new driver, who, by the way, didn't use the Jake to shift on mountain grades.
I don't know about the driver who took the wild ride, never saw him again after he was canned for doin' what he did that he was advised not to do, but he did anyway. And it wasn't for wastin' fuel.

I'm not sure, but there might be a moral to that story.

YeaH!
Right on.
The bark is worse than the bite anyway.
Muzzle it.

Yeah, what a fool.:smt091
Imagine him thinkin' we'd believe he's been livin' there for what, ....... fifty years? I mean, what kind of a simple-minded so-and-so would believe that's possible?
Get real.
It takes all kinds to make the world go 'round.
If they're gonna make up a story, at least make up a story that everyone can believe.
Ya reckon.

Where, exactly, is it that we're goin'?
Dispatch is wantin' an ETofA.

If that's worryin' you, fret naught. This topic is resilient to excessive wear, which allows it to continue to be a source of additional information when it becomes available.

One never knows what they don't know until they know it.
Don't'cha know.

Some folks think they can't, but they can.
Other folks think that they can, but they can't understand why they shouldn't.

Just because they can, doesn't mean they should.
And just because they can't, doesn't mean they're inferior compared to a driver who can and does --- in spite of any reason why they shouldn't.

That's right.


....... snip .....

Merciful heavens!
I've been thankin' the wrong people.
I thought it was the Big truck truckin' industry goin' for auto-shiftin' Big trucks in an attempt to dummy-down the drivers of those Big trucks so they'll quit whinin' about their inability to shift properly. It's easier to spec a Big truck with some auto-shiftin' transmission than for some of those wannaBees to learn how to shift properly.

HaiL!
They have always on headlights because some drivers don't know when to manually turn 'em on. Electronic logs, because some drivers can't be bothered learnin' to draw straight lines on a page in a book. And to prevent some drivers from being creative for convenience and/or to increase their take-home bottom line.
Automatic slack adjusters, automatic kingpin release, and the list goes on with more on the way.

What, I think, the future holds, is automated Big truck truck drivers, --- completely programmable for total control. They'll speak several languages so they'll be suitable for any country to utilize. A billion buck business will emerge, probably with main headquarters located in China.

For another look at the possibilities of automation,
read the post below.
After readin' that, we can open the floor to any debate or comments --- and explanations and answers to the question(s) Injun asked can be heard at that time.

Now, let the Q & A begin.

When WAS the last time you drove a Cascadia, and who the hail
came up with a name like that for a Big truck?
Good gawd.
It's a Big truck, not a waterfall.
A name should produce a mental image of the namesake.
When y'all hear "Cascadia", what mental image do y'all see?

Yeah, that's what I'm talkin' 'bout.

 

wow with over 5,000 post's in approximately three years,,,,do you drive a truck? when do you have time to post that much!!

 

Got 13 hours every day according to the HOS.

 

You're close, but a few more details.

The exhaust valves open as the piston reaches TDC on the compression stroke, not maximum compression or Top Dead Center. The valves would hit the piston if this were the case. And you're correct, it takes that compressed air, releases it which actually scours the exhaust chambers. Now what happens is that valves snap shut, the piston reaches TDC, there is no compressed air/fuel to burn and the piston starts downward on the power stroke, but there is no power, so it creates a suction as all 4 valves are closed. This suction pulls open the intake and exhaust valves, they clatter repeatedly, and that is actually what creates the "Brraaaaaap" sound of a signature Jake.

When the piston reaches BDC, the exhaust valves open as normal, and it starts upward again, and depending on whether or not you are still using the Jake, is either ready for a fresh power cycle, or it repeats the process and continues retarding the engine.

So, in theory, it is a compression brake in 2 directions, utilizing 2 strokes of a 4 stroke cycle. I'm not real versed on how it works on a 2 stroke engine, but who uses them these days?

Dead wrong. The huge amounts of compressed air being pushed through the exhaust manifold spins the impeller wheel of the turbo faster which creates boost on the intake side, which in essence, makes the Jake even more effective as it's packing more air in the cylinders to begin with. The fuel is completely shut off when a Jake is engaged - that's what the micro switch on your fuel pump or pedal is for, it cancels fuel flow to the injectors. Bypass that switch, add some fuel to the mix and you'll eventually see broken valves flying out the stacks. And that's not an opinion, it's a researchable fact.

I learned all that from a friend back in my younger days over a roast beef sandwich and a frosty beer. This was a guy who could put his ear to the side of a Big Cam Cummins and pinpoint a bad cylinder - a true wizard with fuel pumps as well. He had my 400 Big Cam I pushing close to 575 horse at the rear wheels.

Lost him to cancer - a true old school wrench. He's the one that told me William Jacobs stole the idea from Clesse Cummins.

And sorry to those who may have already covered what I did. I didn't pick through this thread word for word.

 

If they want to make jakebrakes illegal, then they should make loud motorcycles illegal too. I don't care who is sleeping, if I need to slow down on a hill and its posted, I am going to use it anyway. I'm not risking my life by burning up my brakes and crashing because some yahoo thinks they are too loud.

 

I hear ya.... (no pun intended...)

It just sucks that some of those areas where jakes are posted as unlawful to use are places where jakes should be used. As ive said before, thats why Im glad mine are so quiet because nobody knows when I use them unless they are watchin for my brake lights to come on.....

 

We have a 5% grade hill in my home town. The "no compression brakes" sign is 1/2 way down the hill... Luckily evryone (including state patrol) ignores that stupid sign.

 

And this has what to do with Jake brakes?? Quit spamming.

 

Well if loud jakes become a big enough issue then i'm thinking it will be solved the same way here as in the UK ? National blanket BAN on un muffled jake brakes ! Although all noisy exausts are banned including motorbikes (biker here) They have decibel limits which the cops do enforce & if in doubt they take you to a D.O.T. station to get the level checked ! & if disc brakes are brought in brake fade wont be quite as big an issue ?????