Here's The Fix. Pedigreed Bulldog. 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. The switch uses a ground trigger for the BCM, which turns the brake lights power on. The brake lights may work properly, but the brake light switch may still be defective and need replacement. Additionally, you dont know what else is wrong that could potentially leave you without brakes if not repaired. My Parking Brake Light comes on intermittently while driving down the road. This is the most obvious reason your brake lights won't go off. I went over to the fuse panel behind the dash on passenger side. I have had this problem for about a year. I have a 2014 mack cxu with the mp8 engine, auto trans. Ok about at my wits end with this thing. Don't know where it could be located on Midliner and the most forum members seem like about that either. If your brake lights won't turn off, here's a quick fix for your problem. If the switch has any sort of contact or internal issues, it may cause the cruise control system to cut off unexpectedly when activated, even if the pedal is not . Thank you! But after fooling with it, after putting relay back in, I could not get the lights to go out by pushing relay to one side like it did intially. The brake pedal spring is located under the pedal. 5 Reasons Why Your Brake Pedal Goes to the Floor. JavaScript is disabled. Press and release the brake pedal and test if the brake lights are turning off and on. Quote. Both should be clearly visible without the need to remove any panels. Conversely, determine if your turn signals need replacement this applies to American vehicle owners with blinkers incorporated into the brake light circuit. 6-11 Months The AIR powered Parking Brake knob is located between the two seats . 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. Your link has been automatically embedded. Location:Alexander New York. Discussion in 'Western Star Forum' started by RandyLAROSE, May 15 . Electronic systems on cars especially modern models are indescribably complex, and anything you do could have a knock-on effect on another component. Probably only one wire in / one wire out. So, does anyone know why it would work normally with the Relay removed, but when i put it back in, it just stays on. You mentioned the brake light switch (the switch that lights the brake lights @ rear of truck) , but I am under the impression that this switch has nothing to do with the PARKING BRAKE . ABS Light, Electronic Malfunction Light and Parking Brake light and fuel gauge remain on while ignition is off. Read More How Often Should You Change Your Air Filter In Your Car?Continue, The buzz around Amsoil vs Mobil 1 oils is no secret. The fuel gauge being powered up shouldnt go through either ecm or vecu. A better way to check for a faulty brake light switch is to remove the brake light switch from the brake pedal and check for continuity. More than likely the foot pedal, they have steel pistons in an aluminum housing. I was able to obtain the code information from the blink diagnostics, but I'm stuck with the loss of communication. This is not very common, but it can actually happen if you have recently replaced your tail or brake lights. Older cars do not use a BCM, though, as the switch directly connects power to the brake lights. Verify that the flat portion of the switch bumper is facing the rear of the vehicle. Is the pedal coming back up all the way by it self? Among the most common reasons your brake lights stay on are circuit errors, brake assembly problems, or a low brake fluid level. If you have an account, sign in now to post with your account. For instance, the spring must be the right type and hold the proper tension. This is the most complicated option and should be looked at last. The brake light switch is a two-way mechanism near the brake pedal and is often marked. truck is a 1998 kenworth T401 which is very simular to the other t models. One of the symptoms commonly associated with a bad cruise control brake release switch is a cruise control system that cuts off unexpectedly. Disconnect the wiring harness by pressing the locking tab and pulling the harness away from the brake light switch. For more information on how the brakes work, check out this article on Auto Chimps. Your car brakes are meant to keep you from getting into an accident. When the brake lights stay on after you turn the car off, you should immediately look at the brake light switch. Let's ride! It may be due to a defective rubber stopper or debris/corrosion between the brake switch and pedal. (How to Fix), Brake Lights Not Working But Tail Lights Are? This switch is typically attached to the pedals arm via a bracket with two wires attached to it. 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. You can post now and register later. Recieved a touble code of 7-3 from the ABS Light. 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. Sometimes can drive the car for 30-40 minutes and no lights come on. If you have an account, sign in now to post with your account. Backup camera not working 99% of the time and brake lights staying on unless I pull the fuses. I be done so much with my truck that I'm sure the dealer won't warranty any of it anymore. Here's how. Thanks. Fords had it for over a week now, they replaced the brake switch with no luck. The brake pedal switch is located near your brake pedal and you can often adjust it. Sure might be a short circuit in the stop light wiring and so on. 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. If it's all of the brake lights, I'd lean towards the brake light switch, but just to eliminate the recon tails as the problem, I'd try unplugging them one at a time and see the other brake lights go out, then unplug both and see if the 3rd stays illuminated, maybe even put your stock lights back on. Come join the discussion about performance, bulletproofing, modifications, classifieds, troubleshooting, maintenance, and more! Pasted as rich text. As an Amazon Associate, I earn from qualifying purchases. The term electrical fault encompasses an almost innumerable range of possible problems. It does go off after about two hours of driving. When the brakes are applied, the ABS senses when a wheel is about to lock and then releases just enough brake force to get the wheel rolling again while still maintaining as much braking force on the wheel as possible. Learn more on our about page. location of brake light switch 2012 mack cxu 613 with automated transmission truck will not shift out of neutral when pressing brake pedal and has no brake lights on tractor message across screen says depress pedal . The best way to test if it is a switch or a foot pedal or trailer valve is to drain all the air from the truck every last drop. Truck starts/runs/drives normal. Here are steps on how to replace it: In summary, here are 12 ways on how to fix stuck brake lights: The next time anyone asks you, Why are my brake lights stuck on? you should be able to assist them with where and what to inspect. The forums are not affiliated with Mack Trucks, Inc. The cost of fixing a brake light switch will depend on the make and model of your car. Logically on or near the Parking Brake Knob. Here are a few steps to follow. The elec. If you find it intact, you might be able to reattach it. Over time, this could drain it and make starting difficult. I can't imagine why this replacement part can't be made from plastic line or braided rather than steel pipe. When the switch inside the brake system isn't working right, your lights can't turn off. I am now, to use a big word beyond my capabilities, befuddled! Copyright 2023 Mechanic Base. It's pretty difficult to figure this out without a wiring diagram and I don't want to send you on a wild goose chase. Looking for a direction on where to go. The next thing you will need to look at is the wires attached to the switch. On my 86 R model there is a pressure switch out under the cowl on the firewall, the switch is plumbed into an air line with (if I remember correctly) one wire connected to it, every spring when I get ready to use the truck this switch is stuck.I tap it a few times and it releases and works fine the rest of the summer, maybe this is where you could look for your problem. By far, the most likely reason for your brake lights staying on is a brake light switch failure. Yes, the pedal comes all the way up. Without your consent employers will not be able to contact with job offers, would you like to opt-in now? I have taken my turn signal switch apart and cleaned it and nothing had changed. ", No dirt built up under pedal. This author has been vetted and has the necessary know-how or education to be able to write about this topic. Youll often find him working with his 1.2 Vauxhall Corsa. If it's not a simple fix I will take it to the dealer when I have time. good luck. Found the switch being attached to the firewall. I totally agree, I think tomorrow I will remove the wires going back to the pigtail from the firewall and test again. It is illegal to drive with your brake lights stuck on. Specific Topic Forums for Antique & Modern Trucks, ! When all else fails, you should take your car to a mechanic. You also need to remove the brake switch from the brake pedal linkage. Posted January 24, 2016. Simple. It's coming from the motor or somewhere up front. Brake light sensors are an inexpensive part that may need adjusted, as you may find. Im seeing a few back there and some of them are being a PITA to get out. Fully releasing the parking brake will get your brake light unstuck. Just throwing this out. Only one of the two wires attached to the brake light switch should render this result. If you break the harness release by accident, you can use electric tape to hold the pigtail in place during reassembly. So I will check the two switches. By checking this box and clicking the "Send me job offers" button below, I represent that I: By checking this box and clicking the "Send me job offers" button below. 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. But when exactly does normal end and problems begin when, Read More Car AC Leaking Water (Causes & Fix)Continue. Canada: View a printable PDF on understanding your vehicles ABS. leversole 11.2012, 10-4 Vlad I'll check the things comin off the trolley valve. If there is something wrong with the BCM, this could leave the brake lights stuck on. Each company we work with has specific experience requirements for their drivers. Never the tail lights. Sometimes if you wait and tap the foot brake they will go out or grab the spike and they will go out . The fuse that controls the tractor lights also powers the trailer stop light relay. If the stopper is missing, you want to look around on the mat where it might have fallen. this will make the brakes stay on and also the lites. So if any Midliner owners need some 18mm OD tubing send me a message, Ive got two 6 foot lengths. Tighten the adjustment nut and bolts with a ratchet and socket. Dont lose the mounting hardware, as you will need to reuse it when installing the new switch. I'm going to pull the tailights today, only problem is I don't have the factory's anymore. Connecting/disconnecting the wires or wire to the ground (chassis) you can check it's what you're looking for or not. Always stay on. To verify if this is why your brake lights are stuck on, examine the floorboard beneath the pedals for bluish or yellowish rubber crumbles. The forum is owned and maintained by Watt's Truck Center, Inc. an independent, full service Mack dealer. If youre in traffic and your brake lights stay on, other drivers may not see you actually braking, which could cause a rear-end collision. If you see otherwise, adjust the brake switch so that it gets to open the connection. 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. The fix? Retrieved a trouble code of 6-4 from Electronic Malfunction lamp. SOMETIMES, when I disconnect the batteries, the headlights are already off, but not the tail lights. If you dont have an available service manual, revert to the manufacturers website for diagrams and steps. *when the switch is on I can turn on flashers and brake lights for trailer function properly. 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. Mack 97 ms3, daytime running lights won't shut off. The ECU might be malfunctioning to a severe extent. The problem also could be a broken rubber tab behind the brake peda. 1 Year If the brake lights stay on after replacing the switch, the part could be low-quality or incorrectly installed. To do this, you will need to: Another brake assembly part that is commonly found at fault is the brake pedal switch bumper. Thats especially true if you have no mechanical experience or know-how. To check on this, locate the master cylinder or the brake fluid reservoir on the drivers side of the cabin. Paul. Not only are these lights confusing to other drivers, but you could be putting excessive wear on your brake pads or rotors. Another reasonably simple cause is installing the wrong classification of light bulbs. I can get two of these braided hoses to get to the length I need , And Im assuming this type of hose is an acceptable replacement BUT will I be able to find adapters to connect to the the two locations on the truck ?? While some issues are simple to assess and fix, others occur due to unkempt car parts. Brake lights warn other vehicles behind you when you are about to slow down or stop. Pushed on the brake pedal worked normally. When an ABS malfunction is detected during this test, the lamp stays on; otherwise, the lamp turns off after a few seconds. Even the smallest amount of debris can lead to trouble. Otherwise, it continues to look like you are braking because you are. Brake Lights - In some systems, cruise control is disabled when a brake light is blown. 2 Years The pipe has many pinholes in it and the braided hose is badly rusted. Replace the bulb if its the wrong type. The two air valves (parking brake and trailer air supply) come as one unit , I've removed this unit many years ago from its mounting place .. and I believe the only things connected to the knobs are the air lines. My backup camera went out too and I'm sure they will say the lift caused it.. Maybe it did. Oct 2, 2006. (pic shown in original thread @top of page). In CDL School Now The simplest option is to have a mechanic install a new one. Hello, sorry to bother a year later but Im having this same issue. The pedal must come back to its original position for the switch to close and the lights to cease working. Then locate the negative terminal and disconnect it. Also check for built up dirt under the pedal that is keeping it slightly depressed. How Long Does It Take To Charge A Car Battery While Driving? The forums are not affiliated with Mack Trucks, Inc. 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. (How to Fix), 6 Causes Of A Sticking Brake Caliper and How to Prevent it, 4 Symptoms Of A Bad Rocker Arm and Replacement Cost, 5 Reasons Brake Lights Are Not Working But Tail Lights Are, 6 Reasons Your Tail Lights Are Not Working But Brake Lights Are. Please add some more information. Dont take chances with the braking system. Will brake lights that stay on drain the battery? And also the lites fault encompasses an almost innumerable range of possible.. Is located near your brake lights of fixing a brake light comes intermittently... Next thing you will need to look like you are braking because you are braking because you are about slow! Off unexpectedly there is something wrong with the loss of communication warn other vehicles you. Problems, or a low brake fluid level part that may need,. 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