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Jake Brake

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Steve from Tn

01-01-2002 07:04:32




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I have been seeing a sign that says "Jake Brakes Prohibited". I think it has to do with 18-wheelers. What are they and why would a town prohibit their use? Just curious. Steve




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IDIOT BUSTER

01-01-2002 23:10:27




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 Re: Jake Brake in reply to Steve from Tn, 01-01-2002 07:04:32  
They wouldn't be so bad if dumb truckers didn't have to use them near houses, especially when they're going uphill! Just because they like the sound. Wish they'd stick their head in the exhaust pipe.



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eabq3i3

01-01-2002 23:51:20




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 Re: Re: Jake Brake in reply to IDIOT BUSTER, 01-01-2002 23:10:27  
your the idiot they can't work when pulling



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IDIOT BUSTER

01-02-2002 21:14:00




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 Re: Re: Re: Jake Brake in reply to eabq3i3, 01-01-2002 23:51:20  
eabq3i3- Look in the dictionary under "sarcasm". If you know how to read that is.



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T.J._N.J.

01-01-2002 09:24:24




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 Re: Jake Brake in reply to Steve from Tn, 01-01-2002 07:04:32  
I used to drive a lo boy hauling all kinds of construction and ag equipment. A Jake is a very useful accesory on a big truck but some guys just seem to like to hear it way to much especially with straight pipes. There is a pretty hefty fine now in N.J. for exceeding the decibal level with straight pipes but it is rarely enforced.A jake slows the engine by holding the exhaust valves open and killing compression, it works to slow the truck and also makes it easy to shift. Some states require you to have an engine brake on your truck if you are hauling over weight loads to help keep your brakes from over heating.I used to see no engine brake signs out in Ohio in Amish country because they can scare the heck out of a horse when they bark. T.J.

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Massey444LP

01-01-2002 10:27:22




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 Re: Re: Jake Brake in reply to T.J._N.J., 01-01-2002 09:24:24  
Jake Brakes open the exhaust valve at the top of the compression stroke, dumping the high pressure created out the exhaust system. This creates a condition where the engine has to work to push the piston against compression on the up stroke without the benefit of this pressure to push the piston back down. The quick release of this high pressure is what creates the sharp "bark" in a straight pipe. There is a detailed explanation on the Jacobs website.

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F14

01-01-2002 07:16:24




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 Re: Jake Brake in reply to Steve from Tn, 01-01-2002 07:04:32  
They're an exhaust (decompression) brake, usually on trucks carrying heavy loads, like 18 wheelers, and 10 wheel dumpers. Some of them are REALLY loud, hence the "No Jake" signs in town.

I live at the bottom of a long hill in a little bitty fishing village. Local contractor lives at the top of the hill. Young fella (took over business from his Dad) drives like a maniac. Hits his Jake at the top of the hill and bellers all the way into town. Sure do get tired of listening to it.

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TP from Central PA

01-01-2002 09:01:27




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 Re: Re: Jake Brake in reply to F14, 01-01-2002 07:16:24  
I kinda like the sound of a "Jake," maybe because I only hear them every summer when a farm across the river picks Beans, they use the Jake coming down a good hill going to town. If you want to hear some noise you should hear our Volunteer Fire Company's old La France Truck pull out of the fire house at mid-night, A 5" chrome pipe with no muffler is really loud!



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ROY

01-01-2002 07:14:51




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 Re: Jake Brake in reply to Steve from Tn, 01-01-2002 07:04:32  
Thay are to noisy.



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the tractor vet

01-01-2002 08:38:38




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 Re: Re: Jake Brake in reply to ROY, 01-01-2002 07:14:51  
The only reason that they are so loud is because the IDIOT that ownes that truck or that is driving that truck thinks that it is cool or neat to make noise with out the muffler on . I have owned or operated trucks that have had JAKE BRAKES on them since 1970 , had them on the Detroit's ,Macks ,Cummins ,And Cats and if the muffler is in place there is not hardly any differance between acceleration and decelaration , but pull the mufflers off with a 5 inch exhust god help you . And if any of you have ever driven a BIG TRUCK then you would know just how much it helps you control that truck comming down a hill and just how much it save you in repairs on the brakes and it just might save yours or someone eles's life. But since we live i a wourld of IDIOTS . I would just love to put just one of them behind the wheel of a semi with a load on it and put him in the hill with out a jake and let him get the true feeling of tarrior when you over heat the brakes and if you would have had the jake on you would have not had to touch the service brake at all.

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Jeremy

01-07-2002 18:14:03




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 Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 08:38:38  
HEHEE.. been there, done that. Got the nerve problems to prove it! ;-) I agree... there's a right time and place to use em... residential areas aren't one of them. Needless to say, I no longer drive truck... nor will I ever.



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DW

01-03-2002 15:31:26




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 Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 08:38:38  
I went down cabbage hill toward Pendelton Oregon with 80,000 # on. An L10 Cummins and no Jake break. I didnt like it much.



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the tractor vet

01-03-2002 19:31:49




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 Re: Re: Re: Re: Jake Brake in reply to DW, 01-03-2002 15:31:26  
Was that 80000 gross or net , us buckey coal buckets would call that a feather merchant load . If ya did not have at least 90000 in the wagon you was still in trainen . Ya learent real fast on how to drive when you had to come out of strip mines and some times they had to put 992 cat on or a475 Michagan either pushen or pullen ya .



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DW

01-04-2002 08:18:40




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 Re: Re: Re: Re: Re: Jake Brake in reply to the tractor vet, 01-03-2002 19:31:49  
It was 80,000 gross. I still didnt like it very much,because I had never been outside the midwest. OK?



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Franz

01-01-2002 12:50:21




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 Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 08:38:38  
Dammn right TV! Neighbor has a Western Star, and I defy anyone to tell if the Jake is operating or not. Sound control is all in the mufflers.
Wonderful world when IDIOTS make regulations they don't know a dam thing about, and spend money to put up signs. Too bad the same IDIOTS can't put up a sign and regulate their nitwit kids with car sterios that vibrate my windows from 500 feet away.



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ron g

01-01-2002 12:33:47




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 Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 08:38:38  
AMEN



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F14

01-01-2002 09:19:43




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 Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 08:38:38  
Yer right there, TV. I fully understand the advantages and importance of the Jake, and don't object to the kid using them, but I wish to he11 he'd get a muffler on 'em.

Of course, this is the same kid that buys a brand new pick 'em up every year and puts glasspacks on it.

He inherited his ideas about maintenance from his father: Run it into the ground then buy a new one. Don't believe he even owns a grease gun.

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Steve from Tn

01-01-2002 10:36:12




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 Re: Re: Re: Re: Jake Brake in reply to F14, 01-01-2002 09:19:43  
I preciate the lesson. Been wondering and had no idea how they worked. I have heard them barking and just thought it was a young whipper-snapper showing out. In some instances, I believe they might have been showing-out some.



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the tractor vet

01-01-2002 17:54:11




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 Re: Re: Re: Re: Re: Jake Brake in reply to Steve from Tn, 01-01-2002 10:36:12  
Once you run a semi or stright truck with a jake on it you become dependent on it , it makes that much differance and adds that much more control and if you are relieing on it and it quites it will put the fear of god in you . I had mine quite on me one night while going east on the Pa. turn pike and of course i was just a flyen with a vary large load and hit the first tunnel at around 70 to75 and when you come out the other end it is a sharp curve to the left and down hill for a long way we always back down to around 65 to 70 and let the jake take us down the mountain in 12th gear and never touch the brake pedal unless you got ot panach stop well when i let up on the throttel it came on then there was a flash under the dash and on jake it blew the fuse and there was the turn all i could think was here we go it took some shell we say creative driven and a lot of sweaten and buy the time i got to the bottom of the mountain i had smoke comming out of all the wheels it did not tqake long to fix it and i sure did not use anymore fuses it got a circit breaker with slow blow and auto reset.

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mel

01-02-2002 11:28:30




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 Re: Re: Re: Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 17:54:11  
Know exactly the stretch of highway you are talking about. I worked on that piece in 1980 when they put in the relocations and took out a lot of dangerous curves. Prior to that I think we had about 40 truck wrecks per year. That was the Allegeny Tunnel just east of Somerset where the terrorists took down that plane. It was 7 miles down the mountain and I know your heart would be in your throat without brakes.

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llamas

01-02-2002 03:36:39




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 Re: Re: Re: Re: Re: Re: Jake Brake in reply to the tractor vet, 01-01-2002 17:54:11  
That's a cautionary tale!

Everything everyone else said. A compression brake doesn't need to be any noisier than the engine it's on - the only reason some big rigs bark so bad when the Jake comes on is that the mufflers have been rodded out.

It's good to remember that the Jake brake is entirely electrically operated, and has various electrical sensors, eg to the gas pedal and the brake pedal, as well as an electronic control unit. They are not 100% reliable. I once got stuck in city traffic in a Peterbilt with 350 CAT with the Jake brake stuck ON, but only on one bank - try driving that!

llater,

llamas

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