Jake brake not working on high

1984 t800 kenworth with a 3306 cat in it jake brake not working need wiring diagram has power throw switchs and throw - Answered by a verified Technician. ... High School or GED. 2,004 satisfied customers. Kenworth C15 Acert engine. Jakes and cruise are inop. All. Kenworth C15 Acert engine . Jakes and cruise are inop .

A Jake brake is an engine brake to slow the truck down on downgrades. The intent is to keep from using the foot brake and getting the brakes hot. Properly used and in the correct gear, you can desend a 6 % downgrade without touching the foot brake. Drivers that use a Jake on level ground are just trying to show off.The Engine or Exhaust brake option is available, and RETROFITTABLE on 2004 and newer DT466/570 engines, plus the MaxxForce 8,9, and 10 engines. The Engine brake works in a manner similar to, but not the same as, the "Jake" style of engine brakes. It also combines use of the VGT function to dramatically increase total engine braking power.Using a Jake brake makes the descent safer and more controlled. It reduces strain on the truck's brakes. When needing to slow down quickly—approaching a sharp curve, a traffic light, or a vehicle unexpectedly pulling out in front of the truck. Avoiding brake fade. Brake fade occurs when brakes lose effectiveness due to overheating, like ...Sep 15, 2021 · My 4cyl jakes act like they don't turn off when you hit the accelerator, clutch or even turn the switch off. They sound like they keep running for a few seconds after they should have cut off completely. 2cyl jakes work fine. Need to find a solution quick as this is my main rig. Thanks. working on a cummins isx15 engine serial number 79779054 jake brakes are not working not getting power to the solenoids ohm on solenoids are 10 ohms need wire diagram from ecm to to the injector/jakes ... I need to know if I can change a ntc444 cummins engine from a low flow radiator to a high flow radiator, and what parts are involved. ...There should be a tag on the valve cover. It could start with 4CK, 8TC, or 5EK. I mainly need to know if this is a 3406 PEEC engine or a 3406E. A PEEC engine is half electronic and half mechanical. If it is a PEEC, ir will have a pump and external fuel lines. If it is a 3406E, it will not have a pump and external fuel lines.The cost of running a truck is of high importance to the truck owner. Longer lasting brake material is a selling point. Jake brakes do nothing to improve CO2 emissions, and add weight the engine and would not be seen as an improvement to a buyer. They are not a priority to the car engineer. Jake brakes are very noisy.This is accomplished by a hydraulic circuit that opens the exhaust valves near the end of the compression stroke. Engine brakes provide the maximum retarding power at rated speed; therefore, gear selection is important. Position 1 = 33-percent engine braking powerPosition 2 = 67-percent engine braking powerPosition 3 = 100 percent …

The Jake brake doesn't seem to work under 1800-2000 RPMs then will kick in and be very strong but will kick in and out every 2 seconds, like someone is turning the switch off and on. It does this very consistently. I'm thinking it's got to be an electrical issue, clutch switch is good, not sure how to check the fuel switch on this one.Aug 20, 2021 ... Go to channel · Detroit diesel 671 2 valve or 4 valve head? Hill climb, engine problems? Tuneup settings? Bus Grease Monkey•578K views · 19:39.Here's the new part number for the brake pedal micro switch 82274560 I paid $15.17. You also need the new style bracket. You might also need a small screw and nut to mount the new style switch to the new bracket. The switch comes with a coiled lever that looks like a spring and that's what actuated the micro [email protected]. Sorry for the long explantion.We have a 2004 Monaco Dynasty with a Cummins 400 ISL. Our internal Jake brake has a high/low switch in the panel to the left of the drivers chair and a foot switch that is pressed and held to activate the jake brake. Our jake brake stopped working entirely.The Jake Brake is powered by a terminal on the car's ignition switch. The electric charge helps engage the Jake Brake whenever the button is triggered. A circuit breaker or a 10-amp fuse is used to safeguard the circuits against overloads and other dangers. If you want to know the fuses I used, check this fuse assortment kit from Amazon. As a user, one may be concerned if the Jake Brake can be ...

Joined: Dec 2016. CM870 Jake problem. Hello guys! I have Cummins CM870 with 1.238xxx miles and my engine brakes works weird. I did change 2 solenoids and also new wires that runs under head cover, tune up is done too, I did it all last summer and nothing helped. I noticed that when engine is cold, under 180F Jake brake works as it should but ...Feb 12, 2022 · Posts: 87. Jake brake high low switch question. So, the compression brake quit working on my 04 Windsor, with 400 ISL. Dug into the schematic, gets power (indicator lamp comes on) located and feel the relay click Start chasing the wiring. Looking at the schematic, there is a solid line drawn between the two poles on the switch. Volvo VNL jake brake don't work Discussion in 'Ask An Owner Operator' started by Schöne, Nov 10, 2021. Nov 10, 2021 #1. Schöne Bobtail Member. 47 20. Feb 23, 2019 ... I drove with out Jake's in the mountains, I was in 6th gear. It sucked. Brake pedal switch went out or maybe it was the clutch switch. 77fib77, Nov 10, 2021. 77fib77, Nov 10 ...When equipped with a Cummins engine that have the Cummins Intebrake (their version of the Jake Brake), it will either have a switch AND a setting button that have 3 position, or it will have a stalk with 6 position and a toggle button at the end of the stalk. Cummins Intebrake use the tradtional method of the jake brake, working on the number ...Typical engine brake solenoid related brake performance symptoms would be: Front solenoid EPA07/ EPA10/GHG14 - Loss of low engine braking. Rear solenoid EPA07 - Loss of medium engine braking and high will be the same as low. Rear solenoid EPA10/GHG14 - Medium engine braking feels like low and high will be slightly better than low due to EGR flow.IMA KEEP IT REDNECK. Feb 13, 2019. #3. Best guess, the multi stage switch isn’t functioning properly, or the orings in the valve are leaking. I’m guessing when you say the motor don’t cut out that you mean the injectors keep firing. Also if your rockers are working properly that should create at least a slight stumble.

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No codes pointing to jakes, just a ground speed code, ecm memory battery code. The engine in low gears 1-8 will reach 1700rpm and loose all power no pull loaded or empty, re-shift up to next gear and pulls again up to 1700rpm then engine sounds like it "blubbers" and no pull. Gears 9 and 10 pull ok but @ reduced power and no miss.Feb 11, 2017 · 6.7 Engine Brake Issues. I just have a few questions. Looked around but didn't see anything related to my exact issue.. So my turbo engine brake is not working on a consistent basis. Sometimes when I got the button on the engine brake works, and other times it doesn't. The conditions seem to be the same all the time I'm at highway speeds. The Engine or Exhaust brake option is available, and RETROFITTABLE on 2004 and newer DT466/570 engines, plus the MaxxForce 8,9, and 10 engines. The Engine brake works in a manner similar to, but not the same as, the "Jake" style of engine brakes. It also combines use of the VGT function to dramatically increase total engine braking power.Supplying a ground enables the Jake brake for Cylinders 3, 4, 5, and 6. Low Jake request (pin K3) Supplying a ground enables the Jake brake for Cylinders 1 and 2. Park Brake (pin H2 on the ECM) Has no effect on Jake functions. Service Brake (pin G2 on the ECM) Has no effect unless Jakes are programmed to only come on with service brake. Throttle

I have a Cummins ISX 870. with a jake brake issue. I only have 1 stage. Insite shows Switch at 100%. I have checked everything. Here is the strange part. After checking everything . I made 2 jumper wires to go from the engine harness plug at the head pass thru to the 2 solenoids. I run the engine up then let off the rear solenoid works front ...Jake Brake turns 60, but conceived 90 years ago. May 11, 2021. Then Jake Brake is now in its 60th year of service, with more than 9 million of the engine compression systems made. It's history ...Rating: 6/10 I was on edge all day following a noon press screening of Michael Bay’s Ambulance — the new adrenaline-fueled movie starring Jake Gyllenhaal, Yahya Abdul-Mateen II and...First and foremost – make sure your brakes are working! Test the Jake Brake at the beginning of each trip. Also, the Jake Brake works best on dry roads, in normal weather conditions. It can be used in combination with the foot brake. However, make sure that when you use the Jake Brake, the engine is not cold. It should be …jake brake question. I am new here and see that this is a valuable resource and a wealth of iinformation. I live in western Co in the mountains and all of my driving is in the hills and mountains. I have drove trucks loaded heavy with cummins engines, cat engines, detroit engines, and mack engine. My experience is that cummins has the strongest ...4276 posts · Joined 2007. #7 · Jul 4, 2011. No, a Jacobs brake (compression brake) only opens one exhaust valve. If you look in the pic, the red circle shows the valve that releases compression when the brake is activated. AThe one in blue is the other exhaust valve and is only used during normal operation.hello everyone,recently bought a 2007 sterling with Mercedes OM460 La on it,Truck runs very good,strong,but when I apply the jake brake, trucks automatic loses power,sounds strange and notice smoke come from somewhere under the hood too,very frustrated because truck seems very nice until this happens,anyone can guess what's going on with the engine brakes?The Jake brake is not a substitute for working service brakes, so you can't rely on it entirely to stop your vehicle. ... The Jake brake is stronger when you're running high RPMs in low gears. The Jake brake relies on the airflow in your engine to function. This means that the faster your engine's cylinders are churning, the stronger the ...When I use the brakes with the Jake brake on and on high I see no results, even after down shifting to 4th. Do I have a problem other than mental? ... You can test to see if the jake is working by simply starting the engine from the drivers seat with the toll window open, increasing the rpm's with the transmission in neutral, then releasing the ...When it comes to purchasing a pre-owned vehicle, there are numerous factors to consider. One crucial aspect is choosing the right dealership that offers reliable and high-quality o...amishdonkeys Discussion starter. 247 posts · Joined 2009. #1 · Oct 9, 2011. Have a 1995 379 Pete w/ a 12.7L 60 series detroit. Jake brake and cruise control doesn't work. There is power to dash switchs for jake and cruise. Power to the clutch sensor. Clutch sensor was tested and checked out OK.0 Videos. 2 Comments. 0 Reviews. Trouble Shooting Guide for Jacobs Brake. Support Topic. Get Support. 1. Previous Tutorial shifting a 5 and 4. Next Tutorial Replacing the B …

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Edit Reason: More info ) 2012 kenworth with cummins isx cm2250, jake brakes quick working after being washed. Has full delete on truck. Clutch switch, and brake switch working. Engine brake has on off switch as well as level switch, level reads 100, 66, 33 and 0 if I switch on off switch off. The engine brake outputs all say inactive and engine ...When is the engine brake most effective? At high RPMs with the transmission in a low gear ... The Jake Brake actually limits the amount of exhaust that can flow out of the engine. ... its mostly used 6 thru 10 gear, 25 to 65 mph, at 1300 to 1800 rpm. And works better the higher the RPM but will work on my truck from 1300 to 1800. Woody's ...On a 6% grade or more, low,isn't going to do much, use high. The ISC engine never offered an engine brake, not available, only an exhaust brake. The ISL only offered an engine brake. Exhaust brake is simply a restriction on the exhaust while the engine brake is a timing change on the valve train.New Zealand. 0. I drove a C-15 in a KW while mine was in the shop 3 weeks ago and the jakes on that were weak they made all the right sounds but just weak. Over here CAT jakes arent even on the same page as ISX jakes thats why I have a brakesaver as well combined with jakes they will blow away a ISX easy down hill.Jake brake high low switch question. Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. So, …I have seen where the clutch pedal / foot brake pedal need tp be touched by foot to re engage/ reset the cruise and jakes . Try this going down the road , get up tp hwy speed , tap the clutch pedal where the free play is and then set cruise and see if it will work . The cruise and Jakes may just work . Good luckThe Jacobs Engine Brake ® (also known as the "Jake Brake ® ") is an engine retarder that uses the engine to aid in slowing and controlling the vehicle. When activated, the engine brake alters the operation of the engine's exhaust valves so that the engine works as a power-absorbing air compressor. This provides a retarding, or slowing, action ...4,204. 6,019. Aug 26, 2014. 0. It's not self correcting. Pull the three wires off the jake housing's and connect a hot wire to them one at a time to isolate which valve cover to take off. Watch oil flow change from top of slave piston housing, when wire is removed or hand is taken off center of solenoid.

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check plug at ecm, jake control is on the big plug at back( facing firewall) the wires to the jake are the first ones below the notch. You can press on them with a awl or dental pick, make sure screw holding plug is tight. With a abs code you may have wires rubbing together, sometimes it's easier to replace the harness than spending hours ...working on a cummins isx15 engine serial number 79779054 jake brakes are not working not getting power to the solenoids ohm on solenoids are 10 ohms need wire diagram from ecm to to the injector/jakes ... I need to know if I can change a ntc444 cummins engine from a low flow radiator to a high flow radiator, and what parts are involved. ...A Jake Brake is an engine retarder that is commonly used in large commercial vehicles to assist in controlling speed and reducing wear on the vehicle's brakes. The Jake Brake works by opening the exhaust valves in the engine during the compression stroke, which creates back pressure and reduces the engine's compression braking effect.With EngineOFF you can test these 2 solenoids to hear if they "click" on by applying 12V to either wire. One wire controls front 3 cylinders retarding, other controls rear 3 cylinders. Low Jake engages the same 3 cylinders, Hi Jake engages all 6. What the above does not explain is how to get 2 stages.The Jake brake is not a substitute for working service brakes, so you can't rely on it entirely to stop your vehicle. ... The Jake brake is stronger when you're running high RPMs in low gears. The Jake brake relies on the airflow in your engine to function. This means that the faster your engine's cylinders are churning, the stronger the ...There would have to be alot of mod done to the 6.7 to get a Jake to work. The cost would not help neither, the newer diesel use exhaust brake. The only ones I see are on the Detroit, those are the older models DDEC'S and series 60. ... The 2010+ mf13 also in 3 stages uses a EBPV for the first stage, engine brake 2nd stage and colse the …This is normal. On the later engines the jakes would not come on at idle. The reason is at idle the foot of the driver is off the pedal which in turn closes the switch on the governor to activate the jakes. This is set up this way so that while driving when the driver removes his foot, the jakes come on. The only bad part is if the jake switch ...The original Jake-equipped engines that ran continuously around 1900-2100rpm were replaced by engines that cruised at 1400-1600rpm. The Jacobs Brake was designed to work at high revolutions, maximising the number of retarding strokes per kilometre, so at lower revs that braking power was greatly reduced.Hey Truckers! D13 2013, with 900,000 miles and the customer brought the truck in because the Jake Brake is not working. Tune in as Jose takes a look at the t...Mar 25, 2024 · Jake brake on ‘97 kenworth w900 not engaging fully in high. Low and medium work as usual but high setting runs more like the medium and sputters out. Good afternoon and welcome to JustAnswer! I'm Nick and I'll be helping you out today. Please give me a few minutes to review your question and I'll be right back. Here's the new part number for the brake pedal micro switch 82274560 I paid $15.17. You also need the new style bracket. You might also need a small screw and nut to mount the new style switch to the new bracket. The switch comes with a coiled lever that looks like a spring and that's what actuated the micro switch. ….

Re: DD15 Rear Jakes stuck on not activated. Sep 17, 2020 5:53 PM You definitely had rear engine brake hanging up- I would replace solenoid and manually operate them while checking for plungers sticking on 4,5 and 6 and also check for oil leaks from rockershaft/jake brake rocker arm area. I would replace solenoids-both, atd has defiantly been ...Since the Jake Brake ® was introduced in 1961, we have been a partner in the trucking industry's quest for safe, reliable, and efficient commercial vehicles. Today, over 10 million Jake Brakes have been sold globally, and now the Jacobs Engine Brake ® has a new home at Cummins. As part of the Cummins family, we will continue to supply you with industry-leading engine brakes as well as ...Service, Parts, and Support. Here you will find all of the information to service or install your Genuine Jake Brake ® - parts and service literature, part number cross-reference, tune-up kit and solenoid lookup, where to purchase parts, and more.Jan 21, 2019 · Posts: 131. HELP: Cummins N14/Allison Jake Brake Issue. Over the last month or so, I've noticed my Jake Brake working intermittently. Today, it nearly became a major issue that could have harmed my family. We live in Arizona and took the kids to a soccer tournament. I was traveling through Salt River Canyon (20 miles of 6-8% grade). Apr 22, 2019 ... 60 series Detroit jake brakes, JAKES WERE NOT WORKING IN ALL STAGES. WHEN I'M POINTING AT THE BACK OF THE BLOCK, THATS WHERE THERE IS ...My Jake brake isn't working. I turn it on nothing not even a indicator light on dash comes on. Cruise works I can set it at idle and raise rpms. The engine is a c13 Lee15325 truck is a 386 Pete vin 750952 I replaced the injector harness, put 6 new injectors in, and ran a overhead. The jakes didn't work prior to this but after completing the ...Special thanks to you ShooterK2, I started the truck today, flipped the cruise control ON, used the reset to try and increase rpm, didn't work. So with the engine running, cruise control on, I put my foot under the clutch pedal and lifted it UP, then used the reset and sure enough the engine rpm increased.Use a gear that is low enough to allow the jake to do 90% of the braking when descending a steep slope. To safeguard the motor, run the Jake in the shifting range, around 1100-1400 RPMs. It's dangerous to use it when shifting; it might cause your truck to stall. Jake brake not working on high, Find out what Jake Brakes actually are and how they work to slow down enormous semi-trucks, pickup trucks, and trailers. There’s no doubt you’ve heard Jake Brakes being used on semi-trucks ..., There are only three things that can cause this. The first and most common is a faulty harness. Your engine has two. You have already replaced the one under the valve cover so I would suspect the outer harness. Second are shorted jake solenoids. It's very rare for all of then to short out. Lastly is a faulty ECM., The. front engine brake solenoid controls cylinder 1 and 2. The rear engine brake solenoid controls cylinders 3, 4, 5, and 6. NOTE: On all DD engines, engine brake performance increases as engine speed increases. The engine. brakes are most effective at higher engine speeds. Engine brake solenoids typically do NOT cause engine., Location: Wimberley Texas. Posts: 20. Jake Brake Won't work. 2003 Monaco exec. Cummins ISM 500 with 2 stage Jake Brake. It started working intermittently awhile back. It then got to the point that when you applied the jake brake pedal the only way it would work was when you toggled the switch from low to high. I took it to Cummins and they said ..., A compression release engine brake from Jacobs Vehicle Systems, popularly known as a "Jake brake" A view of engine compression brake rocker arm (the thinnest arm at the left of each set) Jacobs Engine Brake Division logo A compression release engine brake, compression brake, or decompression brake is an engine braking mechanism installed on some diesel engines., Feb 12, 2022 · Posts: 87. Jake brake high low switch question. So, the compression brake quit working on my 04 Windsor, with 400 ISL. Dug into the schematic, gets power (indicator lamp comes on) located and feel the relay click Start chasing the wiring. Looking at the schematic, there is a solid line drawn between the two poles on the switch. , Adding "real" Jake brake to an ISC. Does anyone have any experience adding a Jake Brake (engine compression brake, NOT exhaust brake) to an ISC engine? I see the parts required can be bought (used) at a reasonable price at a number of salvage operations. The changeover looks fairly straightforward, with the Jake Brake components essentially ..., Captain Pothead Dec 4, 2016 @ 8:34am. Mine works. I noticed in the options my engine brake was not set, so I set it. #1. jeffunik72 Dec 4, 2016 @ 11:35am. Thats the thing Ive re-installed from scratch.. without mods... and it still doesn't work. #2. Chris Dec 18, 2016 @ 3:30pm. Lost the jakes on all the trucks as well., I need some help. My Jake brake isn't working. I turn it on nothing not even a indicator light on dash comes on. Cruise works I can set it at idle and raise rpms. The engine is a c13 Lee15325 truck is a 386 Pete vin 750952 I replaced the injector harness, put 6 new injectors in, and ran a overhead., The cost of running a truck is of high importance to the truck owner. Longer lasting brake material is a selling point. Jake brakes do nothing to improve CO2 emissions, and add weight the engine and would not be seen as an improvement to a buyer. They are not a priority to the car engineer. Jake brakes are very noisy., Cruise and jake brake do not work on my 2008 Peterbilt with ISX in it. Just had ECM replaced and tuned. worked before. ... Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent. Tory Johnson, GMA Workplace Contributor ..., Jun 28, 2018 · BrooksAD Discussion starter. 11 posts · Joined 2018. #18 · Dec 16, 2018. 2008 6.7 - engine brake doesn't activate - still researching. Well, I guess I need to be a bit more consistent in this thread so I can get my my issues resolved! ;^) Good to read other things that are getting resolved in here, anyway. , On a 6% grade or more, low,isn't going to do much, use high. The ISC engine never offered an engine brake, not available, only an exhaust brake. The ISL only offered an engine brake. Exhaust brake is simply a restriction on the exhaust while the engine brake is a timing change on the valve train., The Celect N14 the Jake brake was controlled by two relays in the fuse box. one relay for the center head and one for the front and back head, if I remember correctly there is also a fuse for them. I would pull the relays and fuse and make sure the connectors are not corroded. I have seen the rivets that hold the terminals on the dash, Oct 29, 2020 · keep stroking. I'm working on a 2004 Cat MBN C15. The jake brake has always given the driver trouble. After closer inspection of the assemblies, I found one of them cracked. It has the Pac Brake brand on it. For some odd reason I was told that only the MBN engines used this particular jake brake assembly. , Cruise and jake brake do not work on my 2008 Peterbilt with ISX in it. Just had ECM replaced and tuned. worked before. ... Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent. Tory Johnson, GMA Workplace Contributor ..., I have seen where the clutch pedal / foot brake pedal need tp be touched by foot to re engage/ reset the cruise and jakes . Try this going down the road , get up tp hwy speed , tap the clutch pedal where the free play is and then set cruise and see if it will work . The cruise and Jakes may just work . Good luck, 47 posts · Joined 2020. #1 · Nov 14, 2023. I'd like some info on the use of the engine brake on my 2022 Ram. First I'm towing a 14k 5th wheel trailer. I'm very unsure of the engine brake system. When I'm rolling off a steep downgrade, I put the trans into 2 or 3 gear and sometimes the engine brake comes on but most of the time it doesn't., By using a Jake Brake, this pressure is significantly reduced, leading to less wear and tear. This not only prolongs the life of the brake pads and discs but also reduces the risk of brake failure due to overheating. Enhanced Fuel Efficiency: When a Jake Brake is employed, the truck's reliance on fuel for deceleration decreases., Joined: Jan 2018. RE: ISX 870 jake brake issue. Those percentages show that the ECM is recognizing the 3 different stages you command. Your problem is probably gonna be in the engine (possible solenoid or rocker), jake wiring harness, turbo, or the turbo plumbing and actuator system. What boost pressure readings are you getting under a full ..., Jake brake not working. 2006 Freightliner columbia. New switch. New switch, harness, connect to scanner. Shows signal on - Answered by a verified Technician ... Hi sir I have 2006 freightliner Columbia highway truck Detroit series 60 14l engine problem is I changed transmission now problem start is truck rpm going up and down …, really ECM output has current sensor. not sure, but may get short circuit fault code. In 24 v trucks it works, not sure about 12v trucks. Ok, before u do it, check wires and solenoids with DVOM. May be electrical parts are ok,and just valve is stuck, October 7, 2011 Scott. Today I found out how a Jake Brake works (also known as "Jacobs Engine Brake" or "compression release brake"). For those who don't know, a "Jake Brake" is what makes that machine-gun like noise that you might hear from semi-trucks when they head down long steep hills. A normal gas motor uses the air flow ..., Service, Parts, and Support. Here you will find all of the information to service or install your Genuine Jake Brake ® - parts and service literature, part number cross-reference, tune-up kit and solenoid lookup, where to purchase parts, and more. , Jake brake issues? Check this first. 76K views 3 years ago. ...more. 26.5K subscribers. Hey Truckers! D13 2013, with 900,000 miles and the customer brought the truck in because the …, The first thing that comes to mind is an intermitant problem with your clutch switch. I have seen this before. It the clutch switch or wiring is faulty the engine ECU may think you are pushing in the clutch and in turn will not allow the Jakes to work. Next is the accelerator pedal may not be going all the way back to idle., Just had ECM replaced and now Engine Brake (Jake) does not work. New ECM was programed to show unit has engine brake. Has anyone encountered this situation and most importantly what is the fix. Cummins in Irvine could not get it to work.....suggested going to repair facility that is familiar with Monaco chassis and wiring., I have a 06 century Detroit series 60 jake brake stopped wrking an now I’m seeingfault code for brake open but cnt seem to find any info on what that code means so I figure gotta be with jake brake any ideas on where to start ... Cruise control is also tied in but I assume it’s working so probably not the problem Rideandrepair, Sep 28, 2018 ..., I have a cat 13 motor with Jake brake problems. Jake brake does not work in level 1. It does however work in mode 2 and 3. I get the fault 121-06 low/hi retarder. I replaced solenoids, checked power, checked toggle switch. I am lost. I unplugged the connector to my toggle switch and still got the fault...please help!, All engines "engine brake" with higher rpms without excessive noise Jake brakes also known as compression brakes are special systems that release the compressed air from the engine before igniting it or adding fuel. This very high pressure release causes much more noise than any normal exhaust. Reply reply., 14liter Detroit Freightliner Columbia 2006. Check engine lights coming on and accelerator pedal no longer works. Also while driving it will speed up. Max Diesel Tech. Electrical theory. 27 satisfied customers. Jake brake is not working Freightliner Jake Brake., As to your thrid part the Higher the engine spins the more Braking force it Generates. Max Braking energy is around 1800 RPM so coming down a mountain with the Jake on you want to be in a gear at that rpm were you not riding the Service brakes and your letting the engine brake do the work for you., Consumers find it revolting when the Jake brake firstly worked fine but stops working. This the not an uncommon occurrence in brake systems since about Consumers find it revolting when the Jake brake firstly works fine but stops working.