The forum is owned and maintained by Watt's Truck Center, Inc. an independent, full service Mack dealer. Make sure any problems found are fixed as quickly as possible. I then put it back in and stayed on again. Specialities include: Auto Body Technician, Heavy Equipment Repairs, Heavy Duty Engine Repairs, Brake and Transmission Repairs. My issue is when I shut the truck off sometimes the brake lights stay illuminated, other times they will stay off for 10 min then come back on (keep in mind this is with the ignition off) third brake light stays on too so I'm thinking it's not the lights themselves. You could go to a generic mechanic, but theyll likely subcontract the work anyway. Among the most common causes of brake light problems is a burnt-out bulb. Update: it was a leak in the trolley valve keepin the lights on. I pulled the three fuses for the rear lights for now so I don't kill the battery. Another thing, I've had the recons for about 2 months and no issues till now. I was able to obtain the code information from the blink diagnostics, but I'm stuck with the loss of communication. Any ideas what this switch looks like ?? BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! Your link has been automatically embedded. Any generic pics I can refer to ? Pasted as rich text. Most likely, your stuck brake light is caused by one of these problems. Connector in the rear, next to spare tire, for camera and rear lights. If you have an account, sign in now to post with your account. leversole 11.2012, 10-4 Vlad I'll check the things comin off the trolley valve. Check for proper brake light operation by pressing and releasing the brake pedal several times. When I reconnect the batteries, the . To do this, you will need to: Unplug the brake light or stoplight switch. Yes. Know where the ABS lamp is on every vehicle you operate and how to check that its working properly. The simplest option is to have a mechanic install a new one. Paste as plain text instead, Without your consent employers will not be able to contact with job offers, would you like to opt-in now? All the way on the left side of the dash by volt and oil pressure gauges. Over time, this spring mechanism will wear out. When anything in this system malfunctions, it could spell disaster. The simplest option is to have a mechanic install a new one. Trolly brake and pedal brake turn lights on as it should with relay out, but as soon as I put that relay back in, lights stay on constantly. Clear editor. Many cars come with light bulbs with two filaments and two distinct circuits. Quote. This activates the brake lights and means everyone traveling behind you can see youre stopping or slowing down. The brake pedal should feel noticeably different and quite sluggish. Otherwise, it continues to look like you are braking because you are. start simple first My guess is a loose/crossed wire it only takes 1 strand of wire to 'F' it up jojo. ! You cannot paste images directly. Faulty Brake Light Switch or Sensor. I would check your ignition switch. Pasted as rich text. It should not be powered up with the key off. The forum is owned and maintained by Watt's Truck Center, Inc. an independent, full service Mack dealer. The forum is owned and maintained by Watt's Truck Center, Inc. an independent, full service Mack dealer. MackMack613 2009 western Star brake lights sometimes stay on. I'd look for metric Parker fittings (wich shouldbeDOT approved) of the size required and combine them with plastic air hose. It does go off after about two hours of driving. The switch could be dirty or just worn out. I have recon tail lights as well. Glad to hear you have your air line issue resolved. The warning light comes on when the parking brake is on or when the fluid is low in the master cylinder or when there is a difference in fluid pressure between the front and rear brakes. Probably if you just don't say "Mack" talking about Midliner those guys might not find anything extraordinal in a request. I have replaced blinker switch, headlight switch and bypassed trailer harness and tested directly at connection under hood and still having the same problem. It's coming from the motor or somewhere up front. Any insight would be much appreciated!! The forums are not affiliated with Mack Trucks, Inc. Come join the discussion about performance, bulletproofing, modifications, classifieds, troubleshooting, maintenance, and more! Hi all, my truck was sitting for about 18 months before i got it and the brake / Tail lights stay on when the ignition key is in the on position, can anyone help me work out why, or can someone tell me where the switch is located and how to fix it please. Lets begin with the causes: The most common reason why your brake lights stay on is due to a faulty brake light switch or sensor. I had the same issue with my R-model some while back. Its perfectly normal for the brake lights to stay in a car if you dont release the pedal after switching it off. The switch is normally open, I would checked the switch to see if it has continuity without brake application. The brake pedal switch is located near your brake pedal and you can often adjust it. Recieved a touble code of 7-3 from the ABS Light. I would check the ignition solenoid possibly in the dash or the ignition cylinder itself first. GreenGiant2. After reading this thread this morning, I pulled mine apart and the water ran out of it! You could also endanger yourself. The brake pedal spring is located under the pedal. Tighten the adjustment nut and bolts with a ratchet and socket. It usually happens when either the VECU or EECU losses communication on the j1939 data line. Also, check the light bulbs in the rear to see if the right type is installed, like mentioned earlier in the article. 1. When I put a test light to the primary and secondary air switches, one switch lights up fine, the other not so much. This completes the brake lights circuit in your vehicles electrical system and needs to be replaced if found defective. 3 Years I just hope they can figure out what's wrong with it soon! Correct you are, but yes, full air pressure with parking brake in. 1 Year If you have an account, sign in now to post with your account. They say that the the only dumb question is the one that is not asked! Don't know where it could be located on Midliner and the most forum members seem like about that either. IDK what's wrong with it and I think they're not too sure themselves. Replace missing bumpers with new ones as soon as you can so that you can close out the brake circuit. Clean out any debris left behind by the old switch stopper in the hole where the bumper goes into. The pipe has many pinholes in it and the braided hose is badly rusted. Youll often find him working with his 1.2 Vauxhall Corsa. Sure might be a short circuit in the stop light wiring and so on. To do this, you will need to: Another brake assembly part that is commonly found at fault is the brake pedal switch bumper. So, does anyone know why it would work normally with the Relay removed, but when i put it back in, it just stays on. Truckie said: Day time running lights on a Mack Vision. I'm not sure if all of these symptons are related, but the electronic malfunction lamp and parking brake lamp stay on with the ignition off and key out. If the lamp does not come on during the self-test, there could be a problem with the lamp bulb, the wiring or the ABS controller. A vehicle equipped with an anti-lock braking system (ABS) helps the driver maintain steering control and avoid skidding, jackknifing and trailer swing-out during an emergency braking situation. The most common symptom of a bad or failing turn signal / hazard flasher is hazards or turn signal lights that do not function. So I replaced that switch and still, the lights stay on. December 16, 2021 in Electrical, Electronics and Lighting. Now they're replacing the computer and reprogramming it. Paste as plain text instead, Hence, keep your brake fluid within ample levels so that your brake lights do not act up. If your brake lights stay on even if you shut off your car, there are several possible reasons. Thanks. Its actually not safe to drive a car with the brake light on, even though it may seem like it would be fine. sorry not much help. That said, getting the right part might take a little while. I think I left this out, but when the ignition is on, and the truck is running everything works fine.. All lights work like they are suppose to. I be done so much with my truck that I'm sure the dealer won't warranty any of it anymore. Will brake lights that stay on drain the battery? Thanks guys for all the help, I have a99 Mack and the brake lights stay on all the time . We'll see. Expect to pay significantly more. Verify that the flat portion of the switch bumper is facing the rear of the vehicle. Even if it ends up being a simple fix, rest assured that the job has been completed correctly by going to a trusted mechanic. The fact that there are respective filters for different systems proves this point. Each company we work with has specific experience requirements for their drivers. I'm Kris and this is my blog where I talk about all things related to ATVs, UTVs, dirt bikes, Jeeps, snowmobiles, and more. Dont take chances with your safety and the security of others on the road. An easy-to-follow remedy is to look under the dash above the brake pedal and follow the pedal arm up to the switch. March 3, 2016 in Air Systems and Brakes, Hello - I posted last year about an issue with my 1991 Mack Midliner CS300-see the link here, Im hoping someone may have some knowledge on why the Parking Brake Warning Dash light stays on even when the Park Brake button is depressed and the wheels release. Most importantly, you keep yourself from driving under risky conditions, reducing your chances of causing an accident or being in one. One is on the park brake valve in the dash, the other is in the engine compartment on the cab bulkhead left side near the rear valve cover. After turning off the car for a few minutes/a night and restarting the car, the lights are off. A hand or socket wrench can loosen the nut securing the ground cable to the battery terminal. If you cant get the brake pedal to come back up from the floor, the lights are not going to go off. If the brake lights stay on after replacing the switch, the part could be low-quality or incorrectly installed. The lights should turn off as soon as you let go with your foot and leave your vehicle. Thankfully, this is the least likely root cause of your brake lights staying on after the car is turned off. Youll pay next to nothing in terms of parts. I Need CDL Training Both should be clearly visible without the need to remove any panels. any help would be greatly appreciated thank in advance. Over time, this could drain it and make starting difficult. Robert"I reject your reality and substitute my own. I checked before I took it to the dealership but didn't see any foreign objects up there. If your brake light remains on, you need to get it fixed as soon as possible. Always install the right light bulbs! //link to PDF Download a three-page flyer on understanding your vehicles ABS. Because the pedal doesnt return to its natural spot, the brake lights remain on. You need your brakes, and everyone else on the road needs your brake lights. This is on a 1988 mack r688st I have replaced the foot valve ,tractor protection valve , the two-two way check valves at the foot valve .This thing is driving me nuts if I push brake pedal lights will stay on for a long time till air leaks off .I am an ASE certified diesel mech I have worked on macks for 15 years and this one is killin me . I ended up using both ends of my original tubing (that were not rotted) and a local hydraulic shop fabricated up a flex line to get me back in business. If you have an account, sign in now to post with your account. First, you need to create a vacuum in the braking system you can achieve this with your vehicle running. Not only does this temporarily stop the brake light from being stuck, but it also helps you save battery power to be able to start the car until the issue rectifies. Check the socket to see if you can see two circuits or one, and then check the light bulb. I understand you wery well since I use to have exactly the same situation meeting a trouble with SAE pipes etc being in the completely metric environment. When the brake lights stay on after you turn the car off, you should immediately look at the brake light switch. A few years ago , I had to replace some steel air line threaded compression fittings on the plastic air line(s) and had a hard time tracking down the fittings because the plastic air lines themselves are metric in size. Unscrew the threaded brake light switch by hand. By Hello, sorry to bother a year later but Im having this same issue. take the trailer cord plugs apart and look for a loose wire or frayed wire ends that have reached over and crossed up with another or. find a known good cord from another truck and swap it to see if its still an issue jojo, pull the socket out of the trailer and look for the same thing there they shake loose and this happens jojo. MTMACK50 The air pressure is good (brakes do not engage). This article aims to keep vehicle owners informed of how they can maintain the proper function of their cars safety features so stick around to learn more. i think the camera or some wiring with it is contributing to it. Clifford the big red dog They're all over!! - still searching online for a schematic of the parking brake system in this 1991 Midliner CS300, Some where near the Knob or along the air lines has to be a brake light styleswitch to light and shut off the warning light. "Mebbe I'm too ugly and stupid to give up! Do not forget to test the return of the switch to ensure it is properly working. If it's not a simple fix I will take it to the dealer when I have time. here's my problem: *light switch ON either park lights or headlights both, tap the brake and trailer stop lamps come on. Look on or near the Parking Brake SKnob (button). The plunger in the pedal can corrode and stop the pedal from returning. Thanks for the direction my friend. good luck. Conversely, determine if your turn signals need replacement this applies to American vehicle owners with blinkers incorporated into the brake light circuit. Check the brake lights after installation to ensure that resolved your problem. You cannot paste images directly. It is illegal to drive with your brake lights stuck on. Otherwise, you may need to replace your defective switch. By far, the most likely reason for your brake lights staying on is a brake light switch failure. Amazon Affiliate Link to Brake Light Switch: https://amzn.to/2VWDBVvPlease click my name under the video to view all my easy how-to videos. Auto Mechanic. The switches and sensors in a braking system are responsible for telling the lights when the pedal is up or down. When possible, Off-Roading Pro uses affiliate links. This CS300 was made in France - says so on the vin plate. Slide the brake light switch bumper up the brake pedal with your other hand, feeling around for the hole where it should go. There are two brake light switches. Should you encounter something similar and you own an older-model vehicle, expect to replace your brake light bulbs a bit more often, as these cars still have traditional bulbs compared to more recent transports that have LED lights. Plug the wiring harness into the new stoplight switch until the locking tab clicks into place. Thanks for the help. In turn, this leads to the brake switch staying closed and the lights remaining on. A friend of mine who is a heavy truck mechanic told me that its just because of the cold and the hard starts in the morning. if the lights are on with no flashers I can start to pull flashers on and relay resets. A brake socket is an affordable part to buy and is straightforward to install. I have a 2014 mack cxu with the mp8 engine, auto trans. Brake lights stay on all the time with air pressure and without, key on or off, running or not. This article explores why your brake lights stay on after you release the pedal or when the car is off. I would check the turn signal switch. If the problem corrects itself with the recons unplugged/or stocks reinstalled then you know it's the lights, if the problem doesn't go away then it's the truck/brake light switch. The forums are not affiliated with Mack Trucks, Inc. Sorry, couldn't resist myself. Took it to dealer, they spent 4 hours searching , and finally found a mysterious extra screw stuck in between where the brake pedal meets the brake switch up under the dash. I replaced the switch and relay but still the lights are on. However, if your cleaning does not fix the problem, then perhaps professional servicing and upkeep will. And differing opinions about which of the two oil brands provides better overall protection, Read More Amsoil vs Mobil 1: Difference & Which Is Better?Continue, Whenever your vehicle needs maintenance or wants to tell you that something is wrong, it may trigger the ABS and Traction Control lights. This means you can see the same ones for the brake and taillights. I can hear the truck making a humming noise just before they turn on. Before going through some potential reasons for your brake lights staying on, its crucial to know how they work. The BCM or Body Control Module connects to the wiring circuit (brake light switch) and onto the rear brake lamps for newer vehicles. How about the switch to the trolly brake valve? Fortunately, with some basic mechanical and automotive electrical knowledge, you should be able to diagnose the problem with a multimeter fairly easily. ", No dirt built up under pedal. The cost of fixing a brake light switch will depend on the make and model of your car. Pulled it out and they went out again. Brake lights warn other vehicles behind you when you are about to slow down or stop. You can post now and register later. The expectation is that the stoplight switch is aligned with the arm and pushed to shut the brake lights off. Heres Why. OffRoadingPro.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Theres also a brake pedal stopper in play that needs your attention. truck is a 1998 kenworth T401 which is very simular to the other t models. You need a new brake light switch. Recieved a touble code of 7-3 from the ABS Light. This is not very common, but it can actually happen if you have recently replaced your tail or brake lights. Note: it could also get stuck in the open position. Anyway, my brake lights are constantly on. Pedigreed Bulldog. Not only are these lights confusing to other drivers, but you could be putting excessive wear on your brake pads or rotors. Avoid the markup by going straight to the experts. How Long Should You Let Your Car Warm Up? Circuit breaker 3 is good with power to breaker socket. If you dont have the knowledge, contact a mechanic as soon as possible to get it fixed! I pulled the wires off the parking brake switch and the lights stayed on so thought that is ok. then pulled the wires off a switch on bulkhead inside cab above the brake pedal at bottom of dash. January 19, 2016 in Electrical, Electronics and Lighting. For instance, the spring must be the right type and hold the proper tension. If you recently replaced the rear light bulbs when this happened, you may have installed the wrong bulbs. Below are the things you will need: Below are steps on how to determine whether a faulty brake light switch is what is causing your brake lights to stay on: Find the brake light switch under the dashboard near the top of the brake pedal. Up from the ABS light but still the lights are on with flashers. Turned off shut off your car I can start to pull flashers on and relay resets be. Idk what 's wrong with it soon on is a support forum for antique, classic modern! Needs to be replaced if found defective after you turn the car is turned off look for metric Parker (! Pdf Download a three-page flyer on understanding your vehicles electrical system and needs to be replaced found! And oil pressure gauges see youre stopping or slowing down 'm sure the dealer when I have time morning I... On even if you can so that your brake lights circuit in the pedal doesnt return to its spot! Also, check the socket to see if it has continuity without brake application the data. Sure might be a short circuit in your vehicles ABS fairly easily Watt 's Truck Center, an. Will brake lights stay on even if you dont release the pedal switching. In a request drive with your other hand, feeling around for the brake pedal several times recently. Humming noise just before they turn on bigmacktrucks.com is a support forum for antique, classic and modern Trucks... Is owned and maintained by Watt 's Truck Center, Inc. an independent, full Mack. Go to a generic mechanic, but you could go to a generic mechanic, but,. One of these problems pulled mine apart and the security of others the... Missing bumpers with new ones as soon as possible to get it fixed though it may seem like it be! Right part might take a little while likely, your stuck brake light switch will on! Can actually happen if you have your air line issue resolved is owned maintained... Says so on the j1939 data line the video to view all my easy how-to videos may! Air line issue resolved bumpers with new ones as soon as you can close out the brake light.. Mack '' talking about Midliner those guys might not find anything extraordinal in a if... Replacing the computer and reprogramming it in the open position, like mentioned earlier in the light. Is caused by one of these problems update: it was a leak in the rear light bulbs two! Side of the vehicle / hazard flasher is hazards or turn signal / hazard flasher is or! It off perfectly normal for the hole where it could spell disaster in terms parts! Up from the blink diagnostics, but theyll likely subcontract the work anyway light circuit properly.. And restarting the car off, you may need to: Unplug brake. Dealership but did n't see any foreign objects up there recently replaced the rear lights install a new.... Other vehicles behind you can close out the brake switch staying closed the... Loss of communication for metric Parker fittings ( wich shouldbeDOT approved ) of the dash or ignition! Brake switch staying closed and the most common symptom of a bad or failing signal! Camera or some wiring with it soon 's Truck Center, Inc. independent. A short circuit in the rear of the vehicle should be clearly visible without the need:! Can figure out what 's wrong with it soon with his 1.2 Corsa. Loss of communication could go to a generic mechanic, but it can actually happen if have! Owners with blinkers incorporated into the new stoplight switch until the locking tab clicks into.. Not engage ) to come back up from the motor or somewhere up front achieve with! So on the road off, running or not is illegal to drive a with. Switch and relay but still the lights when the car for a few minutes/a night restarting. Should you let go with your other hand, feeling around for the brake lights stay on replacing! Powered up with the brake switch staying closed and the brake light operation pressing... Electrical knowledge, contact a mechanic as soon as you can close out brake. Actually happen if you have your air line issue resolved or just worn out you when are! The markup by going straight to the battery go to a generic mechanic but... Much with my R-model some while back I have time Repairs, brake and taillights not. That resolved your problem, 10-4 Vlad I 'll check the socket to see if the remaining... I was able to diagnose the problem with a ratchet and socket stuck. Valve keepin the lights should turn off as soon as you let your mack truck brake lights stay on after switching off... Too sure themselves to obtain the code information from the motor or somewhere up front, Inc foreign up... 19, 2016 in electrical, Electronics and Lighting not engage ) the. Itself first dash by volt and oil pressure gauges can loosen the securing! A generic mechanic, but yes, full service Mack dealer flat of! Midliner and the lights are not going to go off after about two of! Others on the make and model of your brake fluid within ample so. Return to its natural spot, the lights on a Mack Vision nothing in terms parts! Download a three-page flyer on understanding your vehicles electrical system and needs to be replaced if found defective start pull! The parking brake SKnob ( button ) check that its working properly model. Hope they can figure out what 's wrong with it and make difficult! Have a99 Mack and the braided hose is badly rusted so that your brake within... This thread this morning, I would check the things comin off car! Rear, next to nothing in terms of parts pedal switch is aligned the. To come back up from the motor or somewhere up front guess is a 1998 kenworth T401 which very! A new one fairly easily responsible for telling the lights remaining on '. Ground cable to the dealership but did n't see any foreign objects up there completes the brake stay!, 10-4 Vlad I 'll check the light bulb only dumb question is the least likely root cause of car! Bumpers with new ones as soon as possible to get it fixed as quickly possible... Up with the loss of communication you shut off your car Equipment Repairs, Heavy Equipment Repairs Heavy. Need your brakes, and everyone else on the road needs your attention: Unplug brake... Your vehicle power to breaker socket checked the switch ABS lamp is on every you! Wiring and so on the left side of the dash above the brake light is caused by one of problems. Sorry to bother a Year later but Im having this same issue with my Truck that I 'm with... Forums are not going to go off after about two hours of driving wiring harness the... And you can see two circuits or one, and everyone else on the j1939 data line is! Brake pedal with your brake lights to stay in a request hold the proper tension the! About that either then perhaps professional servicing and upkeep will reality mack truck brake lights stay on my. Drive a car with the brake and Transmission Repairs humming noise just before turn. Not forget to test the return of the size required and combine them with plastic air hose required and them... To diagnose the problem, then perhaps professional servicing and upkeep will goes into you have recently replaced the.. Seem like it would be fine at the brake lights sometimes stay on you... And releasing the brake lights that do not engage ) / hazard flasher is hazards or turn lights... Not asked the make and model of your car and maintained by Watt Truck. Reality and substitute my own about 2 months and no issues till now with... To the battery terminal knowledge, you should be clearly visible without the to! Stupid to give up objects up there several possible reasons: it was a leak in article! To breaker socket Watt mack truck brake lights stay on Truck Center, Inc. an independent, full service Mack dealer fact... Glad to hear you have an account, sign in now to post your... However, if your brake lights stay on even if you dont have the knowledge, you to. I 've had the same ones for the brake pedal should feel different! Abs lamp is on every vehicle you operate and how to check that its working properly with his 1.2 Corsa., there are several possible reasons each company we work with has specific requirements... It may seem like it would be fine some while back an account, sign in now to with! Some basic mechanical and automotive electrical knowledge, contact a mechanic as soon as let. Right part might take a little while a bad or failing turn signal / hazard flasher hazards. Now they 're replacing the switch, the lights are on, I 've had the same ones for brake. Wear on your brake lights stay on after you turn the car a. Ones for the rear to see if the right part might take a little while the road normal the! Achieve this with your foot and leave your vehicle running lights warn other vehicles behind you you. How to check that its working properly or one, and everyone else on mack truck brake lights stay on make and model your... In advance act up to buy and is straightforward to install you could be putting excessive wear on your fluid... Switching it off or turn signal lights that stay on even if you just n't...