Totenhofer Posted February 28, 2018 Share Posted February 28, 2018 Hey guys, ok so I’m aware there’s plenty of Jake brake threads on here but none that quite cover my issue, 1999 Mack fleetliner chr 470, in the morning when I start the Jake brake will work on both high and low selections, but say 10 minutes into driving the Jake will Only engage in The first stage but only when the switch is all the way down, and the second stage will not work whatsoever, and having the switch in the middle position it will do nothing either. It’s very dangerous and frustrating as I really need to use the Jake for the work I do and at this point the first stage of the Jake is no better then putting your hat out the window to slow down. they both work fine at the start of the day, it happens every day without fail. It’s stumped me. thanks guys Sam Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted February 28, 2018 Share Posted February 28, 2018 Think past conversations will include you as far as low oil flow to top deck of engine. Keeping in mind oil powers your jake. Are you aware of which update remedies you have already, or someone previously, installed? Quote Link to comment Share on other sites More sharing options...
fjh Posted March 1, 2018 Share Posted March 1, 2018 16 hours ago, Mack Technician said: Think past conversations will include you as far as low oil flow to top deck of engine. Keeping in mind oil powers your jake. Are you aware of which update remedies you have already, or someone previously, installed? Ageed here your issue is not uncommon! oil preasure / flow is the key! does it have an external oil source Kit on It! Quote Link to comment Share on other sites More sharing options...
Mackpro Posted March 2, 2018 Share Posted March 2, 2018 Yep , see it all the time on the early ETECHs . Works great at first cold start up when oil is cool and thick and as soon as the oil get up to temp/hot and thins out then the engine brake doesn't work at all or barely makes noise . There are lots up upgrade kits for this issue but cam bearings are often over looked for this problem. 1 Quote Link to comment Share on other sites More sharing options...
sllimec47 Posted December 29, 2018 Share Posted December 29, 2018 How about similar issues on a 95 454 E7? (both heads work just not effective) Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted January 1, 2019 Share Posted January 1, 2019 (edited) On 12/29/2018 at 4:48 PM, sllimec47 said: How about similar issues on a 95 454 E7? (both heads work just not effective) The PLN like yours never produced much brake force on their best day. It was more of an engineering issue, not a mechanical issue. Edited January 2, 2019 by Mack Technician Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted January 1, 2019 Share Posted January 1, 2019 your better off by just opening both doors and rolling the windows up. 1 Quote glenn akers Link to comment Share on other sites More sharing options...
Popular Post Hobert62 Posted January 1, 2019 Popular Post Share Posted January 1, 2019 6 minutes ago, theakerstwo said: your better off by just opening both doors and rolling the windows up. Don't forget to hang an empty chip bag out the window for the sound. 1 3 Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted January 2, 2019 Share Posted January 2, 2019 My mentor at the shop told me he had a design for a PLN jake assist. It used the jake relay power-out to apply 10 PSI to the truck air brake system with a solenoid operated valve, then magnify the exhaust noise with a mic piped into the truck stereo system. Quote Link to comment Share on other sites More sharing options...
Hobert62 Posted January 2, 2019 Share Posted January 2, 2019 42 minutes ago, Mack Technician said: My mentor at the shop told me he had a design for a PLN jake assist. It used the jake relay power-out to apply 10 PSI to the truck air brake system with a solenoid operated valve, then magnify the exhaust noise with a mic piped into the truck stereo system. Kinda like a baseball card in a bicycle wheel. 1 1 Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted January 2, 2019 Share Posted January 2, 2019 The noise has a big factor but its all in your head.What good would they be if you could not hear them.I have thought about the telman electric brake but its so heavy and pricey 1 Quote glenn akers Link to comment Share on other sites More sharing options...
Popular Post Swishy Posted January 2, 2019 Popular Post Share Posted January 2, 2019 Sounds like most of U jokers dunno how to drive LOL An engine brake working properely can normally take U down a hill with the same weight U drove up the hill in the same gear with only slight fanning of the brakes sure they dont have much effect in top gear just like accelerating but put m in a lower gear @ the correct speed it will hold U back Rule #1 of engine brakes don't use m until the engine is up to operating temp Rule #2 don't nok m until U kno how 2 drive LOL cya 3 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Mack Technician Posted January 2, 2019 Popular Post Share Posted January 2, 2019 Let's not argue. I think we can all agree on this...… If your in a mid 90's PLN...…... With just the factory Jake, well adjusted...…. you will be able to decel on a mountain pass so long as you are Bobtail and you hit a large elk that is jammed under the steer axle skidding like a big, bloody meat wheel chock and your running against a 30 MPH headwind...… the speed control will be perfect. 3 1 Quote Link to comment Share on other sites More sharing options...
Swishy Posted January 2, 2019 Share Posted January 2, 2019 If U kno the road,+Load U could cum down the hill on the Jakes n not use the truck brakes @ all a slower sppeed with the truck under control cya Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted January 2, 2019 Share Posted January 2, 2019 (edited) 22 hours ago, theakerstwo said: The noise has a big factor but its all in your head.What good would they be if you could not hear them.I have thought about the telman electric brake but its so heavy and pricey I drove a Telma once, behind an E9. Headlights go dim when you power it up, but those things really did it. The variable resistance lever was slick. Edited January 2, 2019 by Mack Technician Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 3, 2019 Share Posted January 3, 2019 13 hours ago, Mack Technician said: Let's not argue. I think we can all agree on this...… If your in a mid 90's PLN...…... With just the factory Jake, well adjusted...…. you will be able to decel on a mountain pass so long as you are Bobtail and you hit a large elk that is jammed under the steer axle skidding like a big, bloody meat wheel chock and your running against a 30 MPH headwind...… the speed control will be perfect. Made me think of Maxwell the Pig. 1 1 Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted January 4, 2019 Share Posted January 4, 2019 Ok I have jake brake question As I understand it Jacobs used to make jake brakes for the E6 but no longer do I also understand that another company has started making them Anyone know anything about this ?? Paul Quote Link to comment Share on other sites More sharing options...
Hayseed Posted January 4, 2019 Share Posted January 4, 2019 Paul, pretty sure these guys sell a Copy of the Jake.. http://pacbrakeoem.com/products/brakes/compression-release-engine-brakes/ Cummins used to sell a "C" brake which was also a Knockoff of the real thing!! 1 Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment Share on other sites More sharing options...
Freightrain Posted January 4, 2019 Share Posted January 4, 2019 Yup, Pacbrake has the knockoff version. Barry used to offer it on the Watts site, he emailed me the instruction sheet like 14 yrs ago. I bought some used Jacob brakes for my 237, and piece mealed it together. Found the throttle switch on Ebay cheap, the rest I made. It works well, in my usage. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
mrsmackpaul Posted January 5, 2019 Share Posted January 5, 2019 18 hours ago, Freightrain said: Yup, Pacbrake has the knockoff version. Barry used to offer it on the Watts site, he emailed me the instruction sheet like 14 yrs ago. I bought some used Jacob brakes for my 237, and piece mealed it together. Found the throttle switch on Ebay cheap, the rest I made. It works well, in my usage. How does it compare tp Dynatard? Can you feel it working, as in holding you back ? thanks in advance Paul Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted January 5, 2019 Share Posted January 5, 2019 21 hours ago, Hayseed said: Paul, pretty sure these guys sell a Copy of the Jake.. http://pacbrakeoem.com/products/brakes/compression-release-engine-brakes/ Cummins used to sell a "C" brake which was also a Knockoff of the real thing!! Thanks Seed Have sent them off a email Will report back what I learn Paul Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted January 5, 2019 Share Posted January 5, 2019 Also Googled them in Australia Will drop them a line on Monday http://www.tieco.com.au/Tieco/Pacbrake.html Paul Quote Link to comment Share on other sites More sharing options...
Freightrain Posted January 5, 2019 Share Posted January 5, 2019 Never had a dynatard, can't say. It does work well for me. I've heard good and bad from others. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
theakerstwo Posted January 5, 2019 Share Posted January 5, 2019 I have a dnytard and a jakebrake.There is no difference in the way they hold on a hill.I like the dnytard better because with these two its instance working when your using it for gear changes on a hill were the jake is slow to come on. 1 Quote glenn akers Link to comment Share on other sites More sharing options...
Freightrain Posted January 6, 2019 Share Posted January 6, 2019 Yes, can't use it to shift very easily. Slow to respond. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
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