Jake brake not working on high

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.

Switch 1, 2, 3 in top or bottom position (1 or 3) and Engine Brake On/Off in Off position - switch 1 says Off and 2 says Off and value is 67. Unplug the on/off switch and the values are -both 1 and 2 say OFF and value is 0 no matter the position of the 1,2,3 switch. Unplug the 1,2,3 switch and the values are - -both 1 and 2 say OFF and value is ...Working on a cummins isx15 engine serial number 79779054 jake brakes are not working not getting power to the solenoids - Answered by a verified Technician. ... Working on a 2005 Mack cv713 vin# ***** The engine brake is not working at all. Neither low or high.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.Check your fuse panel diagram. There will be a fuse that is marked Engine Brake. Pull it out until you get back to a shop and get it checked or if its pretty easy to get the dash off where the brake switch is, just take it off and pull the plug off the jake brake. justa_driver, Apr 30, 2014. #2.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 ...

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 ...0. Mar 9, 2010. 0. Hi there my husband is a diesel mechanic and he is having troubles so I came here for help. He is trying to fix the jake brake and its not working on a 2000 peterbilt c15 cat. He has a new clutch switch , wire harness is good, new jake brake solenoid, new male plug on head harness, checked wires with ohms meter and was …Does the Jake brake work when the cruise goes out ? My 14 was doing the same , the fix was cheap , under the dash by petal . danny23tx, Dec 17, 2018. ... APU has code 61 low or high... dismag posted Apr 27, 2024 at 2:30 AM. Peterbilt 379 Steer Axle Sidetrack421 posted Apr 26, 2024 at 9:56 PM.That's the minimum speed that the engine brakes will turn on at. Technician: Nich M. Yes. So if it's set at 20, you'll need to be going 20 mph before the brakes activate. Ask Your Own Medium and Heavy Trucks Question. Technician: Nich M. Schematic: click here. Click the link above for the schematic. Compression release engine brake. A compression release engine brake, compression brake, or decompression brake is an engine braking mechanism installed on some diesel engines. When activated, it opens exhaust valves to the cylinders, right before the compression stroke ends, releasing the compressed gas trapped in the cylinders, and slowing ... Hi, im working on a 2000 sterling, with a cat C10, and the jakes are not working. I have no codes with ET, the fuse is good, i have power into and out of the jake on/off switch, I have power to the med/low/hi switch and out. If I do the jake solenoid test on ET they do not power up, and no codes. The clutch switch is working, and the throttle ...I am having trouble with the 3 position engine brake not working all the time. This problem has been going on for a while now but it's really starting to bother me. ... Start with tapping the clutch pedal when it does not work. BoxCarKidd, Jan 20, 2022. BoxCarKidd, Jan 20, 2022 #2. Jan 20, 2022 #3. ... High Stepping posted Apr 8, 2024 at 12: ...

Working on a cummins isx15 engine serial number 79779054 jake brakes are not working not getting power to the solenoids - Answered by a verified Technician. ... Working on a 2005 Mack cv713 vin# ***** The engine brake is …We're taking #TechTalk on the road today with a "how-to" on Jake brakes🚐💨Buckle up and tag along for a test drive with John to learn all you need to know a...Subject: Jake brake problem on Cummins ISX. NE, KS. I have an 07 KW (950,000) with a cummins ISX and the Jake brake has stopped working properly, we have already dumped a bunch of money into it and not fixed a thing. The problem is when we leave the yard the Jake will work fine for 15 miles and then it acts like the final stage (the turbo) of ...jakebrake not working on the new Volvo VNL ATS as a keyboard player, whenever i try to use jake brake, it just.. doesn't work..? any idea what could cause it? it's specifically on VNL, i might be dumb if there isn't any jake brake so i'm sorry (new in ATS) Locked post. New comments cannot be posted.

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High idle cruise control and Jake quit working on a DD15 western star Cruise Control. Mechanic's Assistant: Im sorry to hear about the issues youre experiencing with your DD15 Western Stars cruise control and Jake brake, but our truck Mechanic will be able to help you diagnose and resolve the problem. Have you noticed any other issues with the trucks performance or any warning lights on the ...Found a broken wire in the harness and fixed it. I was told to check the clutch pedal switch, brake pedal switch, and speed sensor. Then I was told if it was that, they …speed sensor new, brake pedal switch working , brake air pressure sensor working one next to clutch pedal on the fire wall , clutch switch working , engine brake working ,speedometer working , cruise will work when the truck is parked,will not work when in motion Controls for the cruise, of, on, resume, + and all working when parkedA brake system is one of the most important parts of a vehicle. No matter what kind of vehicle people use, an efficient braking system will always be of utmost concern to ensure sa...If the Jake brake on your 2004 Freightliner Columbia 120 with a Detroit Series 60 14L DDEC V engine is not working, there could be several possible reasons for this issue. Here are some common troubleshooting steps you can take:Check the Jake brake switch: Make sure that the Jake brake switch is functioning properly.Re: Jake Brake not working. #2 by natvander » 25 Feb 2017 23:02. My first suggestion would be to add a (very small) dead zone in your pedals and see if that works. It could be that the game isn't detecting that your accelerator is off. Never argue with idiots. They bring you down to their level and beat you with experience. TruckerKid. Posts: 821.

Performance benefits of Jacobs Compression Release Brake. Provides 85% of the vehicle’s braking needs. Increases productivity by maintaining higher average downhill speed. Reduces slowing time/distances of a heavily loaded vehicle from 90 to 70 kph in 30% less time and distance than with wheel brakes alone. Lowers total cost of ownership.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. When the foot switch was pressed, the transmission would preselect second gear and start to downshift but ...I am having trouble with the 3 position engine brake not working all the time. This problem has been going on for a while now but it’s really starting to bother me. Most of the time I have to downshift before it will work. ... High Stepping posted Apr 8, 2024 at 12:08 PM. 2015 international paystar... Davis42200 posted Apr 8, 2024 at 10:46 AM.What you think is the brake going through stages at slow speed, is actually the transmission shifting down. A lower gear will drastically increase the braking power from the Jake. If the Jake still does not work right, take it to Oregon Motor Coach or Country Coach. Most likely it is in the Country Coach wiring rather than in the engine ECM.Compression release engine brake. A compression release engine brake, compression brake, or decompression brake is an engine braking mechanism installed on some diesel engines. When activated, it opens exhaust valves to the cylinders, right before the compression stroke ends, releasing the compressed gas trapped in the cylinders, and slowing ...An after market exhaust brake will cost a bunch. 2002 GMC LB7 CCLB 4X4 currently with 275,000 miles on it and counting. Line-X, Pilot Car Rack, Beacons, Cab Lights, Gamber Johnson Rack, Pewter of course. 4th set of injectors but still doing its job:gearjamin.The engine brake on our 2001 freightliner with pre egr Detroit 60 series has been weal since day one. ... before its put back together have the jake spools rebuilt. The part where not all cylinders are hitting sounds like electrical at the jake head itself, more than likely one of the spool wires came off, the tech should watch for this on ...isx 15 jake brake shuts off engine when in use Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by roscoedub72, Apr 21, 2020. Apr 21 ... ISX's have 2 jake solenoids and then 6 jake rocker arms which do all the work. (650$ ish Canadian each) If the stop engine light comes on first thing to do is read the codes. pushbroom, Apr 21 ...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 ...5. Measure the resistance across the Jake Brake solenoid. [a] If the resistance is greater than 15 Ω, replace the Jake Brake solenoid. Refer to section 82.2.1.1. [b] If the resistance is less than 15 Ω, repair the open between pins 7 and 8 of the front injector valve cover harness connector and the Jake Brake solenoid. Refer to section 82.2.1.1.

It is an engine braking mechanism installed in a large diesel engine on semi-trucks. When the jake brake gets activated, it opens exhaust valves in the cylinders after the compression cycle, releasing the compressed air trapped in the cylinders and slowing the vehicle. If you use a jake brake when driving on a freeway or downhill, you can add ...

In on, the cruise would not work but the Jake brake would engage anytime you let off of the throttle, regardless of if you had actuated the service brake. ... just High/Low switch). With cruise working and I step on the Jake peddle the cruise disengages but does not turn it off. When done braking all I do is hit the resume on the Smart Wheel ...My Jake Brakes do not work and the speedometer do not work. I was wondering ig anybody has some schmatics for the wireing on these two Items. Submitted: 13 years ... 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 ...Will not disable any Jake functions. Medium Jake request (pin K2) 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)There are EXHAUST brakes for Duramax. Check out pacbrake. The so called "Jake Brakes" on the 6.7 cummins are just a VGT that is designed to work as one, and they do work well but its not a "Jake Brake" like on a big truck. The big rigs that have them that make the cool ass sound work off of the valves some how instead of creating …Jake brake uses engine compression for braking. So if not in gear it does nothing (except maybe kill the engine) and how effective it is depends upon which gear you are in. So in neutral it does nothing. So if you've accidentally engaged Georgia Overdrive on a steep decline, better hope for a runout lane :)Re: Jake Brake not working. #2 by natvander » 25 Feb 2017 23:02. My first suggestion would be to add a (very small) dead zone in your pedals and see if that works. It could be that the game isn't detecting that your accelerator is off. Never argue with idiots. They bring you down to their level and beat you with experience. TruckerKid. Posts: 821.Mar 9, 2007 ... I had the same problem and it was the clutch switch. The peddle was staying down just a smidge off of the top and that was enough to make it not ...6 Best Brake Pads Klr 650 In 2022. 6 Best Brake Pads For Jeep Cherokee In 2022. (1). BD Diesel 1031369 Exhaust Brake. Check Price On Amazon. Features. This product is known for its quality to the refinement of its materials which confer on its very high performance and long service life.The illustration pertains to a four-cycle engine. However, the Jake Brake is effective on both two- and four-cycle diesels. (1) The intake valve opens and air is forced into the cylinder by boost pressure from the turbocharger. (2) Air is compressed to approximately 500PSI by the engine piston.isx 15 jake brake shuts off engine when in use Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by roscoedub72, Apr 21, 2020. Apr 21 ... ISX's have 2 jake solenoids and then 6 jake rocker arms which do all the work. (650$ ish Canadian each) If the stop engine light comes on first thing to do is read the codes. pushbroom, Apr 21 ...

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The brake is an engine compression brake manufactured by Cummins, it is not a Jake Brake which is a trade name of brakes produced by Jacobs Manufacturing but works similarly to the Jake Brakes on OTR trucks. The control rocker for the brake has 3 positions; high, low and off.1216 posts · Joined 2011. #17 · Jan 17, 2013. The literature for my Cummins ISL states they specifically added roller lifters to this engine to deal with the valvetrain loads of the Jacobs model 490 engine brake. Why, I don't know, but it's a big enough deal Cummins put it in their literature. Like.Mar 18, 2022 ... What is a Jake Brake and How Does it Work? ... INSANE JAKE BRAKE SOUNDS Fixed the Jake Brakes ... FREIGHTLINER CLASSIC PAI HIGH PERFORMANCE ...Subject: RE: Cat 3406C jake brake issue. Crivitz, WI. I believe the problem is in the head. The bridge depths were the same. Unfortunately, the height of the valves are different. I tried using a dial indicator but had more consistent readings using the dial calipers. #4 cyl reads 3.150. #5 cyl reads 3.166.The Californiacarlaws.com article, California Vehicle Exhaust Noise Laws. CVC Section 27151, Exhaust Systems. Use of your engine or "jake brake" is not a moving violation. However, when you need assistance with an alleged moving violation, DMV NOTS Hearing, or violation from a roadside inspection, call the traffic law professionals at ...Reman replacement lasted 780k. This time nozzles started to stick just little bed and shroud plate in turbine housing was cracked. Engine brake is about 50% stronger, full boost is little higher and pull harder. Not bad for $2500 repair (no labor, i replace by my self) Slow302, Mar 30, 2015. #8.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.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 ...We're taking #TechTalk on the road today with a "how-to" on Jake brakes🚐💨Buckle up and tag along for a test drive with John to learn all you need to know a... ….

6 Best Brake Pads Klr 650 In 2022. 6 Best Brake Pads For Jeep Cherokee In 2022. (1). BD Diesel 1031369 Exhaust Brake. Check Price On Amazon. Features. This product is known for its quality to the refinement of its materials which confer on its very high performance and long service life.Why Does This Truck Have Weak Jake Brakes? (SURPRISING!) Adept Ape. 243K subscribers. Subscribed. 2.9K. 132K views 3 years ago. In this video was we …Hi, im working on a 2000 sterling, with a cat C10, and the jakes are not working. I have no codes with ET, the fuse is good, i have power into and out of the jake on/off switch, I have power to the med/low/hi switch and out. If I do the jake solenoid test on ET they do not power up, and no codes. The clutch switch is working, and the throttle ...If you are using J-48671–10, measure across Jake Brake 2 pins. If the resistance is between 9 and 12 ohms,Go to step 3. If the resistance not between 9 and 12 ohms, go to step 5. Turn ignition ON, engine OFF; Measure voltage at pin 14 of the MCM side and valve cover harness ground; Remove rocket cover; Disconnect the rear Jake …Feb 22, 2023 ... Comments105 · Why Did I Quit CAT After 19 Years of Working for them? · Jake brakes · How Should You Break In A Diesel Engine? · Does En...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 ...Posts: 733. Joined: May 2015. RE: Jake brake adjustment. When the engine brakes are energised, a piston in the jake lever extends to take up the clearance and then it acts like an ordinary rocker. The purpose of the clearance is to ensure that the lever does not contact the valve or the cam when not in use.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.When it comes to maintaining your vehicle, one of the most important aspects is ensuring that your brakes are in proper working condition. Over time, brake pads wear out and need t... Jake brake not working on high, Re: Complete 8v92 Jake Brake system on 6v92? « Reply #1 on: July 23, 2017, 08:55:49 AM ». I had two sets of the military 8V92TA Jake brakes. One came with the newer Jake fuel lines requiring O rings. Both had fast idle on the governor hi/lo rpm speed adjustor. New style buffer screw Jake switch. They will work on the 6V92 with Jake valve covers., engine brake performance, serious engine damage, or both. NOTE: Slave piston clearance settings for the different engine models are not the same. MODEL NUMBER/DISPLACE-MENT/MODEL YEAR ENGINE BRAKE SLAVE PISTON ADJUSTMENT 6067WU40 11.1L PRE - 1991 760/760A 0.660 mm (0.026 in.) 6067GU40 12.7L PRE - 1991 760/760A 0.508 mm (0.020 in.), May 16, 2022 ... ... not heard on a cold engine ... HOW THEY WORK! ... Crankcase Pressure High on Cummins ISX 15 and X15 - How to Diagnose & Troubleshoot., The Jake Brake is an invaluable, extra tool available for truck drivers. It is primarily used for slowing down a big rig in certain situations. It is not intended as a substitute for the service brakes. It operates using the diesel engine’s own power. The same force that gives the truck power is used to slow it down., Suddenly the Jake brake is not working on my 2006 Dodge Ram Mega Cab Cummins engine. On top of that I hear a metal on metal tapping noise coming from the engine. ... 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 ..., 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., In order to troubleshoot a 2533-5 or 1072-5 diagnostic code, use the "Compression Brake Low/High Override" on Cat ET. In order to troubleshoot a 2535-5 or 1073-5 diagnostic code, use the "Compression Brake Med/High Override" on Cat ET. A. Turn the keyswitch to the OFF position. B. Disconnect the harness at the valve cover connector., Performance benefits of Jacobs Compression Release Brake. Provides 85% of the vehicle's braking needs. Increases productivity by maintaining higher average downhill speed. Reduces slowing time/distances of a heavily loaded vehicle from 90 to 70 kph in 30% less time and distance than with wheel brakes alone. Lowers total cost of ownership., Sep 21, 2017 ... Faulty bunk switch causes all kinds of problems., Jake brake is not working Freightliner's Jake Brake ... 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, discusses work-from-home jobs, such as JustAnswer in which verified ..., Mar 12, 2023 ... Caterpillar C15 engine brake not working #engine #mechanic #trucking. 1.5K views · 1 year ago VANCOUVER ...more. Doc Franklin. 6.54K., Engine brake toggle: turns jake on/off. Engine brake: activates jake brake while you hold the key (default B or N?) Increase engine brake. Decrease engine brake. If you have engine brake toggle set, this will turn it on or off entirely, and the increase/decrease buttons change power when active (power level 1-3) If you don't have engine brake ..., Insite showed 33% on level 1 67% on 2 and 100% on 3. Those percentages show that the ECM is recognizing the 3 different stages you command. Your problem is …, The Jake Brake is an invaluable, extra tool available for truck drivers. It is primarily used for slowing down a big rig in certain situations. It is not intended as a substitute for the service brakes. It operates using the diesel engine’s own power. The same force that gives the truck power is used to slow it down., 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 ..., 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 new Internationals MaxxForce 13 use exhaust brake, which make you think why they are changing to exhaust., The Jake worked on all cylinders for a short time after I changed the cylnoids and again after I changed the wire harness. Low = solenoid 2. Medium = solenoid 1 and 3. High = solenoid 1, 2 and 3. If you would like to ask me another question in the future, you can add me as a favorite Expert., It is an engine braking mechanism installed in a large diesel engine on semi-trucks. When the jake brake gets activated, it opens exhaust valves in the cylinders after the compression cycle, releasing the compressed air trapped in the cylinders and slowing the vehicle. If you use a jake brake when driving on a freeway or downhill, you can add ..., The jakes work on the low side, but the high isn’t working at all. I took the valve cover off and the power wire was broken, replaced the wire, and still nothing. Are there more wires under there I need to check? I couldn’t get the valve cover all the way off, just slid out of the way enough to get to the power wire., Posted 4/22/2013 11:14 (#3054638 - in reply to #3053630) Subject: Re: Cat jake brake on c12 & c13 (reprogram) South Western Ontario, Canada. Easiest way to leave the Jake on and shift is to not let the thottle peddle up to the idle position. Just back off just enough to switch gears and away you go., Aug 7, 2018 ... Engine brake not working. 41K views · Streamed 5 years ago JJ TRUCK ... DD15 and DD13 engine brake, exhaust brake, Jake Brake adjustment., On your steering wheel, press the engine brake button. This will also light up the engine brake icon on your left dashboard and the buttons on your right. Step 2. Select the level you need from the button on your right: high, medium, or low. Step 3. Slowly release pressure while stepping off of the accelerator., 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., 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., 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 …, You're refering to an exhaust brake (NOT a Jake Brake) which simply closes a valve in the exhaust (after exiting the engine) to increase backpressure which works against the pistons (on the exhaust stroke) to (theoretically) slow the vehicle. 1. You'll never be able to hold it closed by hand (at least not tight enough to make a difference) 2. They don't do much anyway, especially when used for ..., 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 …, Detroit is saying to troubleshoot this, if there are any other codes active, troubleshoot those first, if Code 52 is only active, install a test ECM, and if code goes in active, then the problem is the ECM. You most likely have a faulty ECM. We do have the code 84 active as well. Will that be related with the jake brake not working? Code 84 is ..., The switch on the dash selects between high (all 6 cylinders) or low (only 3 cylinders). The foot switch actually activates the Jake engine brake on and off, as long as no throttle input is registered. On my 02 Exec the switch to left of driver is for 2 stage Jake, lo-hi not on/off. Thanks guys!, Mar 16, 2023 ... CUMMINS ISX INTEBRAKE (engine brakes)! HOW THEY WORK! ····. 6.7K views · 1 year ago ARIZONA ..., I have removed the extra wiring shown on the diagram so all you see is the engine brake wiring. The wire numbered 22-A-.8 is the first wire in teh circuit, it goes from the fuse to the jake switch and the relays. When the jake switch is turned on low power goes to pin 85 on the low relay, it goes to pin 85 on both relays in high position., Posts: 733. Joined: May 2015. RE: Jake brake adjustment. When the engine brakes are energised, a piston in the jake lever extends to take up the clearance and then it acts like an ordinary rocker. The purpose of the clearance is to ensure that the lever does not contact the valve or the cam when not in use., Hi there I have a 2013 Peterbilt 386 cummins isx15 and when you turn the Jake brake switch on it works as it should. The problem is that you can't do a stage one Jake brake or stage 2. ... 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 ...