How a Jake Brake Works - Jacobs Vehicle Systems 

Tommy W. Good point and I'm sure you're not rockin the Jig middle of the night with nobody on the streets im sure you're good boss!

I've never understood those signs. Jakes are for safety. That's like saying, "No Brakes". Sure, I'll coast around that curve. *smh*

as far as ive seen those signs are in areas where it is not needed and is not necessary and are usually in residential areas. so if you are going the posted speed limit or whatever you deem to be safe then you will be fine but if you are going faster than you know you should be to the point where you need to drop 10 or more mph to go around a curve then that is your fault.

Studies show that a Jake Brake makes less noise than a Semi crashing through an intersection.

Bisbee has a steep grade and just feet south and down of US 80 on this part are public and private buildings. Los of control could result in the city facing the question, how do we retrieve a tractor/trailer off the roof and the second floor of the library and what's the cost of fixing it? Is it worth it because of it's historical significance to not only the city but the county and state as well? Will the feds help, since the post office occupies the first floor? There is also a large presence of Environazis here as well. The kind that is in large part responsible for Phelps Dodge (now Freeport-McMoRan) all but leaving.

Haha EXACTLY! BRRRRRRRRDDDDDDDRRRRRRR!!

yeah!

Booooooo! Jake rumbles are freakin' awesome!

RamblerTurbo hell yea

You guys must be living a ways from any major highway with hills and don't have to listen to that crappy noise 24/7. I feel sorry for people who've inherited a jake brake fetish. They could care less about neighborhood peace and quiet.

I too like waking up to the sound of tractortrailers, trains, planes, and even tanks

@@gm08351 or, if you are a schoolchild in the Ukraine, your school being shelled by Zelenskyy's "Nazis" who mysteriously never damaged a synagogue.

@@gm08351 better than waking up to them through your living room am i right.

Is that the only choice you have in life?

LOL! Are you mental? Unbelievable that ANYone would say something that dumb!

ooh yeah

no shame in that mate, as long as u are a bit more open minded than hank that is!

You seen the episode where Hank rents a big rig and then navigates himself off the top of a mountain with no fuel or brakes? Best cartoon ever

Propane and propane accessories lol

Jake brake and Jake brake accessories.

I'll tell you what

And the first one ever installed was on his boat. So, when you rev the engine and let the brakes roar, you're carrying on a tradition older than the production of Jake Brakes.

I wonder why Cummins didn't just come standard with this built in

@@P7777-u7r When Clessie Cummins invented the Jake Brake, he was no longer in control of the Cummins Engine Factory, and the people who were in control at that time would not agree to manufacture the Jacobs system, so Clessie Cummins was forced to look for another manufacturer. He found the Jacobs Lock company, who agreed to take it on as they had the necessary manufacturing capability and were in the process of looking for a new product. That's why it's called a Jacobs Brake and not a Cummins Brake. Cummins Engine refused to fit the Jacobs Brake to their engines for some years as they didn't believe it was beneficial to them. Big Mistake! I believe that it was Clessie's Sons who had taken over, but I'm not 100% sure of that.

@@P7777-u7r When Clessie Cummins invented the Jacobs Brake he was no longer in control of the Cummins Engine Company, and they refused to have anything to do with it, so he had to find another manufacturer. That's when he approached the Jacobs Lock company. They had the manufacturing ability and were looking for a new product, so they took it on. That's why it's called a Jacobs Brake, not a Cummins Brake. Cummins still refused to fit it to their engines for some years. Big Mistake! All this is in Clessie Cummins book "The Fire Within". Good reading, that one.

With or without straight stacks? Several belly dumps and bull racks around here have straight stacks and it's music to my ears 😊

I thought Vail had "no jake brake" signs everywhere, because they prefer truckers fading brakes and killing minivans full of kids, versus having to hear that ghastly noise.

To be fair, I too get annoyed at truckers who purposely mod to make jake louder, it's incredibly disrespectful and equates to being a 13 year old attention whore on tiktok. All jakes should be somewhat muffled by federal law.

@@MockOverdrive Vail is a tourist trap these days, growing up just off of i25 i would hear them all the time.

@@MockOverdrive this is a 0 IQ comment lol

+1

That, and they forgot to even mention the whole fuel injection part of how an engine works in this video.

I might help you there! Imagine having big coil springs on the soles of your shoes. If you jump you will compress the springs and they will hurl you back up in the air. Your downward force is storing energy in the springs, and it is given back to you by uncoiling all that stored energy and sending you at least some of the way back into the air with no effort from you other than what you add by jumping back up at the same time to achieve equal or even greater height than before! Now imagine you were jumping on a sheet of plywood suspended off the ground and at the moment the springs collapsed to their maximum point they shot right through the plywood! You would simply land hard and all that stored energy would be wasted! A trampoline would be similar- it stores and releases energy also unless your feet tear through at the bottom of the downward stroke! Now on to the engine. When a piston is in a compression stroke, and imagine you add NO fuel shot at that moment, the piston would "spring" back down just from the stored energy alone in the compressed air at the top of the stroke. NOW, if "something" (the Jake mechanism) opens the exhaust valve at that exact moment when the maximum energy is stored in the highly compressed air, all that energy will be "wasted" when it goes roaring out the exhaust pipe instead of boosting the piston back down. It took a lot of horsepower (COMING FROM THE WHEELS NOW THOUGH SINCE YOU ARE PLANNING TO STOP AND THE WHEELS ARE DRIVING THE ENGINE) to compress all that air, and instead of recovering the "spring" effect it is wasted out the exhaust! It is the SAME principle of driving an air compressor with an electric motor! Horsepower used up in compressing the air and no recovery of energy in the air compressor cylinder. It all leaves the compressor cylinder through a "type" of exhaust valve! So you see that any horsepower delivered to the engine THROUGH THE WHEELS is used up with the Jake system, AND IT AMOUNTS TO BRAKE POWER! SOMETIMES MORE THAN THE RATED HORSEPOWER OF THE ENGINE, SINCE "BRAKING HORSEPOWER" OF 10 BRAKE DRUM/SHOE COMBINATIONS CAN BE CONSIDERABLY MORE THAN THE FEW HUNDRED HORSEPOWER OF THE DIESEL ENGINE WHEN IT IS POWERING THE REAR WHEELS! A very interesting thing is this: AN AMATEUR in a truck can CRASH the truck if he is not loaded, OR if there is ice or EVEN RAIN on the road and all that power available inside the engine COMPLETELY STALLS THE ENGINE AND OF COURSE STOPS THE WHEELS FROM TURNING AT ALL!! Just like slamming on the brakes he will Jacknife before he ever recovers any means to get those wheels turning again and the engine running again!!!

Jeroen de Sterke Damn. You sure are dense.

@@mikep.541 Hurling insults and contributing nothing to the conversation isn't exactly the definition of intelligence.

@@mikep.541 l guess you must be BRILLIANT and understand EVERYTHING.................ROCKET ENGINES,,,,,,,,,,THE HYDROGEN BOMB,,,,,,,,,,,,,3 PHASE ELECTRIC,,,,,,,,,,,,,,ETC,,,,,,,,,,,YES OR NO..

Let me help you...and for a good reason, they don't tell you what is going on...it's very hard on your engine.. they open the exhaust valve at top dead center, venting the compressed air.. valves closed, no air in cylinder and the piston starts down..what happens next? That's right, you pull a vacuum, until you suck the valves open.. you stress the entire engine backwards.. I have seen the tops of Pistons sucked off, rod bolts broken, wrist pins snapped.. Your Jake isn't as strong, in your older truck? Replace the worn out valve springs!!! Or put stiffer ones in, and get a Jake from hell.

Must not be listening? It’s just a basic explanation not in depth

But you forgot to mention that the ticket was issued by the next town and not the one he went through... ;)

Little old ladies have nothing better to do than call 911...don't walk on their lawn...

@@westvalley411 no, it’s the guy with the man purse that moved from California to ruin everything. The little old lady can’t stand that guy, not the trucks.

​@@Californians_go_homeThose Calipawns ruin everything don't they

Good times? I'd give him jail time. Scumbag.

Get paid to listen to Jakes all day, what a life.

@@onefastslimjim 😊

Good, force or threat is the only way to make wild people stay inline. In my area, it is abused because no one baby sit these inconsiderate fools that make unnecessary noise all day long. As long as they have to pay, they obey.

now they fine ya for using the in many places

I'm a little suspicious of this "requirement". I used to drive trucks and not every truck had an engine brake. I've driven in 47 states and have no recollection of anywhere that "required" an engine brake. The responsibility of safely descending any grade has always come down to the driver, not a "requirement" to use a certain type of optional equipment. The opposite is definitely true though. There are many, many places that prohibit the use of engine brakes, and that is something that those friendly cops could be listening for to ensure compliance.

ikr

alex Perez ya I love the sound

shane lord and even louder for the people that hate the jake brake.

GoodISnipr I legit cant understand people who fanboy over jake brakes sound, it sounds like a loud fart

Andrew Gems a professional driver doesn’t care about the noise. They care about getting the load delivered safely. What you are referring to is a bunch of fucking hillbillies who think they have to be making excessive noise in order to make money. Jacobson knows what they are doing. They’ve been doing this for many years. Perhaps you idiot truck drivers could learn something from them and quit worrying about the noise and start focusing on your job.

I ignore them anyway. Jake Brakes are safety devices.

I thought they banned them because of environmental issues.

@@nicolaslugo2658.... "environmental issues"?!!?..... what Environmental issues?.... they're "banned" from use in populated ares by morons who seem to think that Jake brakes are just something for truckers to make noise with.

@@Romans--bo7br mufflers stop the Jake sound effects..

The purses and tampons that come standard on an international provide extra sound dampening lol

Tunnels and overpasses are the s**t!

"I shall play for you the song of my people."

@@josephastier7421 BBBBRAAAAAAAAGAGAGGGGAGAGAGAGAGHHHHHHHHHHHHHH

​​@@josephastier7421*straight pipe no muffler*

idiot

They did a lot of down shifting with their manual transmissions.

@@549BR well, yeah...I grew up near Old Fort, and trucks would go down that mountain at a crawl speed...when I began driving thinking about what gear to go down any particular hill, and having a Jake, was still a thing...I smoked my brakes 3 times over the years...once I was able to stop and just sit and let them cool...twice I was able to catch a lower gear...as I was close to hanging it up I still saw trucks smoking brakes, and today I know it still happens...it seems more frightening seeing it from in a car, and knowing what is going on...

@@549BRdown shifting really doesn’t slow you down like it would in a Car.

@@690_5 That's because diesels generally don't have throttle plates, so they don't generate very much engine braking, unless your tractor is very old and has a gasoline engine.

@@michaelbenardo5695 exactly that’s why they have runaway ramps on mountains diesels will run away because they rely on fuel injection instead of a throttle valve like a gas engine

Tommy Schulte LMAO!

A flat world has no hills hence no need.

You'll slow down with your Jake Brake so you don't go over the edge into space

If the world was flat cats would push everything off the edge!

i htought that to be kinda funny meself .

Yeah it was kind of weird how he seemed to blatantly avoid mentioning the fuel burning

@@nthgth If he mentioned that then the green people would chase him down and state he was causing global cooling, warming, maybe the seasons changing due to global orbit around the sun?

Combus...exapansion!

You mean they engines are not perpetual motion machines? I'm shocked and disappointed about the the implication they byrn those dirty. smelly, global warming carbon emissions! ROTFLMAO

I've never heard an engine brake called a jake brake before :P

I loled!

Thank you. That makes better sense to a dummy like myself.

@@chickey333 Me too ..

@@mikestudmuffin4549 How? The volume is being compressed, not expanded.

This is posted by someone who missed the fundamental reason for how it works. 😊

@@LTV_inc Compression is not what absorbs the energy? That is the fundamental.

When one considers the high-quality production elements with this video, for the producer to omit the fuel aspect of the four-cycle process was most puzzling, indeed!

That's a hot-air balloon you're thinking of.

Yes, service brakes are what the segment of population unfamiliar with proper vehicle nomenclature calls simply "brakes". The Jake Brake works by actuating the exhaust valve rather than the fuel injector. So... the intake air is compressed and then dumped slightly before TDC.

The concept is the same but Volvo sold it as VEB (Volvo Engine Brake). Basically it's the same by manipulating the valve timing/compression release brake.

​@@ajidamarjati Also a valve in the exhaust, witch will cause backpressure to the engine

​​@@ajidamarjatiAlso called PowerLeash on the Mack engines

When have you ever seen a Jake that wasn't on a switch?

He's talking about the noise. Have a Jake with a switch to operate the jake and another for the noise when it is on.

They're been adding that to muscle/pony cars forever, it'd be just as good an idea for a Jake brake. I'd be surprised if it hasn't been done (aftermarket)

Exhaust cutouts, still in use and still sound great.

@@Synthwave89 no such thing. Turn them off in residential areas. They are NOT necessary. They are and always will be a secondary helper brake. There is NO reason to HAVE to use it except in emergency and even then its going to be driver error...damn dude, people don't even know how to stab brake...watch them big trucks smoking brakes on a downhill...its not that they are heavy ...they are just going too fast and end up riding brakes=brake fade. Yes, weight is a factor. But the guy behind the wheel should know if his/her brakes are good...people don't even do PTIs anymore...not thorough ones. Ran an 88 Mack Superliner, NYC to landfills in PA, constantly 82,500 (used allowable percentage years back) 5 sometimes 6 days a week. Over the mountains in PA with NO ENGINE BRAKE. NONE. Most people don't know that trucks used to NOT even have steer axle brakes!

same gear down as over, or one less just to be safe. is what i learned. back in the day.

Wow. An old 903?!! 👍 What was it in?

Man everyone knows you never go full retardation...

WOW 903 YEARS AGO?

Isn't that the system that Caterpillar uses?

Ever driven a straight pipe N-14? 🤤

@@MistaRoyanT fellas fellas I can only get so erect

keeturbo straight pipe detroit diesel serie 60 jake brake 😍👌

@@MistaRoyanT I've driven a Detroit Series 60 with a burned out muffler and it sounded amazing. Truck was worthless and gutless but my engine brake never let me down.

It’s over your head. Stick with your tricycle.

That’s cause your so far up your self you have to fart through your ears. Dogs breath.

What the hell does that have to do with a Jake brake?

@@Icutmetal Because they are the same thing. en.wikipedia.org/wiki/Compression_release_engine_brake So nice to have so much info at your fingertips...try using it!

@@Not_Sure-2020 Used for the same purpose? Didn’t think so.

@@Icutmetal Yes, exactly the same purpose. To slow the engine. It is the SAME THING. Jake brake is just a nickname for a compression release. Did you even read? No? Didn't think so.

@@Icutmetal I swear, I'm not sure why but I'm always amazed when someone is shown definitive proof but they still refuse to believe. Amazing.

The younger generations think that we were in the stone age before computers.

Soooooooooo, instead of purchasing a truck that can safely haul a fifth wheel trailer, they added an engine break to a half ton NEVER designed for that kind of load. BRILLIANT

@@bobward7489 Nope, it's a grade that many have encountered before that overwhelms their tow vehicles. It's a road that they did by mistake.

@@LadyAnuB Regardless, hauling a fifth wheel with a half ton truck is dangerous and irresponsible.

This is the exact place I look forward to driving through when driving back from Los Angeles so I can hear the Jake Brakes. 👍👍

You can't put a Jake on a half ton. Don't know what they told you but it's wrong.

Ed Zachary!

You explained it well!

Blame the noise police, not the engineers, we love our inventions, to hear, see and smell them

As I understand it, they didn’t redesign anything to reduce the noise. The noise reduction happens because of the addition of emissions equipmnt to the exhaust system. It’s acting as a muffler and Jacobs is using that as a selling point.

@@ronaldscott781 exactly! The new emissions systems have many more components the exhaust has to pass through before exiting the exhaust pipe than the old muffler systems.

Uhhh yea they do in real life

@@cableheadcrew3880 No shit??

@@cableheadcrew3880 r/woooosh

+riblets1968 If you see any "No Jake Brake" signs, let us know where they are located so we can educate the town on the benefits of engine braking.

+JacobsVehicleSystems I always wondered why there was a sign by my house and Now I know is because of the noise it makes

JacobsVehicleSystems that is one of the dumbest things I've ever seen, do you even know the proper use the engine brake? it's to help reduce speed on downward slopes to have less ware and tear on the brakes, there is no use or needs for them to be used in a town or a populated area unless you want to be fishing for attention

Thanks for your comment. Please find more information on our website about the noise you are hearing. "I'm bothered by the noise of big trucks using their Engine Brakes, what can I do? The federal government has required all vehicles manufactured since 1978 to meet noise requirements when delivered to the customer, so trucks have been required to meet the requirements when they leave the dealership as new vehicles for quite some time. The real problem here is modified or defective exhaust systems. The use of the engine brake is not the problem. Citizens and truck drivers can both do their part to keep the noise down. Citizens, encourage your local police to stop noisy vehicles and check them for muffler integrity. Truckers, if you know someone who is operating a vehicle with an excessively loud exhaust system, encourage him or her to fix it." www.jacobsvehiclesystems.com/about-us/environmental-health-safety/noise-concerns/

I live next to a railroad track in a small town. Yes, freight trains are required to blow their horns in the middle of the night too. We'll get trains coming through at all hours of the day or night and they're always required to blow their horns. It's a safety issue.

You love the sound of Jake brakes because you don't have to listen to them when you're sleeping at night.

@@jojogo22 I tend to not listen to most things as I sleep, because I'm usually sleeping. It's nice of you to assume that don't live near seemingly any roads, when I live 2 houses distance from a main county road that's one of 3 major roads going to out highways. I listen to every loud vehicle that passed, not just semi trucks. Every loud car, motorcycle, constant helicopters flying low enough that my windows shake, and white trash in the apartments behind me

I think you made a big mistake not starting that over. And this is from someone who also had to restart their trade school.

@@davecrupel2817 I think that all of the time 😐

All high schools should be mandated by law to have well equipped trades classes. It's outrageous that schools have been shutting down stops and trade education programs.

No fuel is injected...

If your foot is depressing the fuel pedal any little bit, the jacobs brake will not engage. Same for the clutch.

No, no modern diesel or gas motor injects fuel when on the brake and no foot is on the gas pedal.

@@1320fastback to a certain extent, you are correct, but not all the time. Certain conditions have to be met. You are referencing DFCO, which, depending on the vehicle tuning, requires certain speeds, rpms, and loads. DFCO works best when the timing is set to near 0, but you get no engine braking this way. Most manufacturers set DFCO timing to allow for a progressive engine braking curve, but this makes the system work less efficiently. Personally, I tune mine to limit engine braking to maximize the time DFCO is activated, except on towing vehicles, which I set for maximum braking. Also, modern automatic transmissions unlock the TCC at 0 throttle, thereby drastically reducing the braking effect during DFCO. This can NOT be changed by programming in most modern vehicles, so you are stuck with a shitty DFCO system that doesn't save much on gas.

Like a separate exhaust valve (only used with the jake brake) that leads to an air tank? That would be really useful.

The Cummins ISX 15 has significantly greater engine braking power (250+hp greater) than the ISM, mainly due to the size difference and haul application. Which ISX configuration do you have and are you comparing the same loads?

JacobsVehicleSystems it's literally the same load and trailer it doesn't slow me down at all

Could you send us a private message with your contact info? We'd like to help solve the issue.

JacobsVehicleSystems mroozing@gmail.com email

Thank you. I will have one of our engineers contact you.

You obviously aren't in the career or you'd understand.

Repeatedly at 2am? Where do you live?

I’ll come outside your house and uses mine all night that should make you happy.

Exhaust valves

I disagree. The best sound a Diesel truck can make is cruising on an open highway, where the driver is making money and work is being done.

@@kenmore01 your right, I guess he does. Until he comes to a 5 car pile up. Then he can eather join them or stop.

It's a Brake, dude, not a Break, FFS.

Oh well 😆

ToothyGus it doesn't. When removing your foot from the throttle while in gear, no fuel is being delivered into the cylinder. The only thing that keeps the engine revolving is the kinetic energy from the spinning wheels. So no fuel is being wasted and your engine stays clean.

Fuel is not injected while jakes are on!

What did you say ?

The "Jake Brake" might not open the exhaust valve to full lift.

@@cjmunnee3356 Ah alright, that makes sense. Thanks.

@@Simon-dm8zv Also, it's possible engines this large might not be interference fit. Heck if I know. Those are the only 2 possibilities that make sense.

@@cjmunnee3356 At least your last name suggests you know exactly how jake brakes work 😀

@@Simon-dm8zv 😂🤣😂🤣😂

f**k kanada!

+Jason Carpp what about in diesel cars that aren't hybrids

+jjovereats I would think that *all* vehicles should be offered with such a system. Anything that helps control the downhill momentum of the vehicle.

Jason Carpp Like a Regen brake (as seen in Priuses)

+jjovereats I'm afraid I've never owned or driven a Toyota Prius, so I don't know what it's called or how it works.

They are used in transit buses and some school buses and so on. But there are different types of retarders ! Like engine brake , exhaust brake, jake brake

EXACTLY

Glad you enjoyed it!

Hi Sandy, Yes, you are correct. There is an error in the animation.