Rickey White Jr Posted November 28, 2015 Share Posted November 28, 2015 I recently bought a 07 CXP613 & did not think too much about the "engine" brake. Recently I noticed that when I have it on high & start slowing down it just totally cuts out. Especially today when I had to use it coming down a hill on a quick red light & locked my trailer brakes when it went out. That is when I realized it was not anything I was doing. This is the first truck I have drove that does not have a regular jake. That being said, I have searched & have been unable to find one so I hope I am not out of luck on this. Is there a way to install an aftermarket jake for this truck before I drive myself insane looking? Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/ Share on other sites More sharing options...
RowdyRebel Posted November 28, 2015 Share Posted November 28, 2015 A "Jake" brake is just an engine compression brake manufactured by the Jacobs Mfg. Co. (Jacobs Vehicle Systems). There are several manufacturers of engine compression brakes, and they all work in a similar manner.What is likely occurring in your situation, is that on an electronic engine there is usually a setting which turns off the brake at a given RPM...preventing the engine brake from stalling the engine. Changing the brand of the engine compression brake won't stop what is happening, because the brake is functioning exactly as it was designed to do....slows you down, and then turns itself off at a set point to prevent stalling the engine. 1 Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313324 Share on other sites More sharing options...
Tuffguy707 Posted November 28, 2015 Share Posted November 28, 2015 You must remember the engine"Jake " brake will only work during certain RPMs and if those RPMs drop to low then it will cut out. The key is to downshift to keep the Jake helping the truck to slow down so as to keep the RPMs up. Also you do not want to rely on the engine brake to slow the truck as if for some reason you lose traction with the rear wheels you will lose control. It is always good to use your brakes in conjunction with the engine brake. 1 Quote Tony Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313326 Share on other sites More sharing options...
theakerstwo Posted November 28, 2015 Share Posted November 28, 2015 Also remember that a jake brake is used or made to use on long grades to keep from using your air brakes heating them up to were they don't hold when the curves are coming up faster then you like. know ever one uses them on almost ever stop but that's not what their made for. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313334 Share on other sites More sharing options...
b61mack Posted November 28, 2015 Share Posted November 28, 2015 Except those gay Peterbilt guys that has 10" pipes so someone will notice them. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313345 Share on other sites More sharing options...
Dirtymilkman Posted November 28, 2015 Share Posted November 28, 2015 Ha Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313348 Share on other sites More sharing options...
theakerstwo Posted November 28, 2015 Share Posted November 28, 2015 I know your right. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313349 Share on other sites More sharing options...
Apple dog Posted November 28, 2015 Share Posted November 28, 2015 Sounds like you could have a bad wire connection.or a weak relay or bad switch.The Dynatard on my Mack would cut out sometimes and I had to put new wire end on it. Unless you put a exhaust brake on the truck changing Jakes will not stop the cutting out at low rpms. A Jake sets on top of the motor under the valve covers and works off of oil pressure and basically slows the exhaust coming out of the motor. That is as simple as I can explain it. Quote This is Mack country. On a quiet night you can hear a peterbilt rust away. Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313365 Share on other sites More sharing options...
hatcity Posted November 28, 2015 Share Posted November 28, 2015 Check the RPM cut out. Prolly around 10-12 hundredalso, the clutch has a switch on it to cut out the engine break Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313368 Share on other sites More sharing options...
Dirtymilkman Posted November 29, 2015 Share Posted November 29, 2015 Actually a jake brake turns your engine into a giant air pump. When a jake is flipped on what it does is open the exhaust valves on the very last second of the combustion stroke. So as your piston goes up, your valves are shut and your piston is trying to compress all of that air in the chamber. Right before combustion would happen the engine brake opens the exhaust valve, thus pushing out all the air before combustion. So for all the power it took the engine to compress the air, it didn't gain any power back from ignition. And thats what slows down your rig. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313402 Share on other sites More sharing options...
Rickey White Jr Posted November 29, 2015 Author Share Posted November 29, 2015 Okay I should have been a bit more specific on this. It will cut out for no reason at about 14-15 rpm. It is like it totally breaks loose. Yes I would like the actual Jake from the Jacobs company but I do not think that will happen. That is why I am looking for an actual exhaust brake and not this engine air compression deal it has. I had the setting checked by an outside dealer prior to purchase and the cut out is 10. Most of the time it holds but lately I have noticed it will give out more often. I took the dash apart today and checked for loose connections on everything and all is fine that I came across. My fear is that there is a seal somewhere that is letting the compression out. Either way I would just like to have a regular exhaust brake and not this new eco friendly noise free family friendly half working brake. Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313406 Share on other sites More sharing options...
Outbehindthebarn Posted November 29, 2015 Share Posted November 29, 2015 Not to hijack the thread (although its related). My Super with E9 has an engine brake.... are they controlled through the governor housing only? Or did they also come with a switch on the clutch pedal? Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313407 Share on other sites More sharing options...
Outbehindthebarn Posted November 29, 2015 Share Posted November 29, 2015 Actually a jake brake turns your engine into a giant air pump. When a jake is flipped on what it does is open the exhaust valves on the very last second of the combustion stroke. So as your piston goes up, your valves are shut and your piston is trying to compress all of that air in the chamber. Right before combustion would happen the engine brake opens the exhaust valve, thus pushing out all the air before combustion. So for all the power it took the engine to compress the air, it didn't gain any power back from ignition. And thats what slows down your rig.Best explanation I've ever read. Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313408 Share on other sites More sharing options...
Rickey White Jr Posted November 29, 2015 Author Share Posted November 29, 2015 Don't knock loud pipes, they save lives! No really I always liked loud pipes but I also like headache free days since I'm up & down steep grades all day. Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313409 Share on other sites More sharing options...
theakerstwo Posted November 29, 2015 Share Posted November 29, 2015 The bleed off engine brake is a quitter system than the jake.The 4000 Mercedes with bleed off system with the blue ox is very powerfull and quite.The way it works is it has a dummy valve with a drilling from the combustion cyl thru the valve when it is open back into the intake port.The dummy valve is opened by a small piston power by air pressure controlled by ecm.When you turn it on for braking it opens the dummy valve and as the piston comes up on compression it has been bleeding off compression back into the intake and unlike the Jacobs brake which waites till the piston gets to the top and then lets all compression off into the exhaust which makes a noise it still has done same thing as the jake brake.The energy it took to compress air is not going to help push the piston back down anymore so you use that energy for braking. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313410 Share on other sites More sharing options...
m16ty Posted November 29, 2015 Share Posted November 29, 2015 From the exhaust brakes I've seen, they don't work very well. About the only reason I would ever consider one is if they didn't offer a engine brake for that engine.Exhaust brakes work nowhere nearly as well as engine brakes. You should be able to get yours fixed fairly easy, there's just not that much to them to go wrong. You've basically got a wiring problem or a solenoid problem or I have seen the valves so bad out of adjustment it caused problems. Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313422 Share on other sites More sharing options...
carlotpilot Posted November 29, 2015 Share Posted November 29, 2015 it should be stressed if not already talked about is that compression brakes of any kind are not intended to stop a vehicle Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313426 Share on other sites More sharing options...
RowdyRebel Posted November 29, 2015 Share Posted November 29, 2015 Nope....just there to make sure you can make that turn at the bottom of the hill! 1 Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313429 Share on other sites More sharing options...
farmer52 Posted November 29, 2015 Share Posted November 29, 2015 Jacobs Brake website...http://www.jacobsvehiclesystems.com/parts-service-support/how-an-engine-brake-works/ Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313450 Share on other sites More sharing options...
Timmyb Posted November 29, 2015 Share Posted November 29, 2015 it should be stressed if not already talked about is that compression brakes of any kind are not intended to stop a vehicleWell said Sir. Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313452 Share on other sites More sharing options...
Underdog Posted November 29, 2015 Share Posted November 29, 2015 Lancaster county "Jake" brakeSent from my XT1254 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313458 Share on other sites More sharing options...
Back In Black Pulling Posted November 29, 2015 Share Posted November 29, 2015 Not to hijack the thread (although its related). My Super with E9 has an engine brake.... are they controlled through the governor housing only? Or did they also come with a switch on the clutch pedal?Yes switch on clutch pedal Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313516 Share on other sites More sharing options...
Rickey White Jr Posted December 1, 2015 Author Share Posted December 1, 2015 So I take it no on knows of anywhere I can find an aftermarket exhaust brake? I did talk to Jacobs company and got transferred to person to person to person to person. Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313778 Share on other sites More sharing options...
GOOG Posted December 1, 2015 Share Posted December 1, 2015 I have an exhaust brake on one of my tri-axle dump trucks. It works twice as good as a Jake brake. It's also very quiet. I would prefer it over a Jake any day! I will look to see who made it. Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313780 Share on other sites More sharing options...
carlotpilot Posted December 1, 2015 Share Posted December 1, 2015 So I take it no on knows of anywhere I can find an aftermarket exhaust brake? I did talk to Jacobs company and got transferred to person to person to person to person.search williams blue ox 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42847-engine-vs-jake-brake/#findComment-313781 Share on other sites More sharing options...
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