To check on this, locate the master cylinder or the brake fluid reservoir on the drivers side of the cabin. Clear editor. Learn the things you should never do to your car in the video below. I fooled around with it for a while yesterday and this is the latest. The stopper could also have come off or otherwise been damaged. There was no flickering or anything when I pulled on it or shook it. Fortunately, with some basic mechanical and automotive electrical knowledge, you should be able to diagnose the problem with a multimeter fairly easily. ! Put them back on and the brake lights went back on. Come join the discussion about performance, bulletproofing, modifications, classifieds, troubleshooting, maintenance, and more! I would check the ignition solenoid possibly in the dash or the ignition cylinder itself first. Sorry, couldn't resist myself. June 23, 2010 in Electrical, Electronics and Lighting. There are many parts of the braking system that can get corroded or covered with debris. If your brake lights stay on even if you shut off your car, there are several possible reasons. If you have an account, sign in now to post with your account. Connecting/disconnecting the wires or wire to the ground (chassis) you can check it's what you're looking for or not. Here are common ways to fix brake lights that stay on: This article lists the most common fixes to stuck brake lights. In CDL School Now The fuel gauge being powered up shouldnt go through either ecm or vecu. Ensure the pigtail harness is disconnected and tucked away somewhere safe before removing the brake light switch, as you will be reusing that same harness later. Pasted as rich text. How to Change Brake Pads With an Electric Parking Brake, 5 Reasons Your Cruise Control Is Not Working and How To Fix It, 5 Symptoms Of A Bad Brake Light Switch and Replacement Cost, 8 Reasons Your Car Is Overheating On Idle & How To Fix It, Chevy Error Code 82: Meaning, Causes & How To Reset. Older cars do not use a BCM, though, as the switch directly connects power to the brake lights. Every month 400 people find a job with the help of TruckersReport. Dont take chances with your safety and the security of others on the road. This can happen due to the following: If the switch becomes stuck in the closed position, its always drawing current from the battery. Hence, keep your brake fluid within ample levels so that your brake lights do not act up. I had to unhook battery cable. 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 . I've replaced the 3 air over electric switches also a new foot valve and the brake lights still hang on for a bit. The brake light switch should close as soon as you press the pedal. sorry not much help. The switch could be stuck or failed..Hope this helps. Clear editor. The elec. Recently purchased a 2015 platinum edition 6.7L (2 months ago) I've had some work done to it, lift kit, new wheels tires, replaced all the lights with recons except the headlights. The pipe has many pinholes in it and the braided hose is badly rusted. Discussion in 'Western Star Forum' started by RandyLAROSE, May 15 . Truckie said: Day time running lights on a Mack Vision. This is a video tutorial on the top 3 most common things to check when an ABS light comes on. If you have an account, sign in now to post with your account. I totally agree, I think tomorrow I will remove the wires going back to the pigtail from the firewall and test again. Avoid the markup by going straight to the experts. Brake lights warn other vehicles behind you when you are about to slow down or stop. You can post now and register later. You can post now and register later. They say that the the only dumb question is the one that is not asked! If your vehicles brake light gets stuck or is not working, it will start to drain your battery. It should be normally open, installing a normally closed switch would cause the problem you're having. When I probe the pole on it nothing, then if I just roll the light a mm it lights up. 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. Just throwing this out. Without taking the leads from their place, depress the brake pedal. I have taken my turn signal switch apart and cleaned it and nothing had changed. Lights not illuminating or returning a 12V reading would mean that the brake switch is not receiving power, signifying a wiring problem. Dont take chances with the braking system. I love to explore earth's natural terrain and share my experience. Answered by Daniel Wilson in 3 hours 6 years ago. Might have to go steal them back off my buddy's truck to test them. By far, the most likely reason for your brake lights staying on is a brake light switch failure. jeffl1107 The switch could be dirty or just worn out. 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. A forum community dedicated to Ford F-series owners and enthusiasts with a Power Stroke diesel engine. Here's how. ", No dirt built up under pedal. When there is a fault in the electrical system, it can affect numerous components, including the brake lights. We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. The flanged part of the switch bumper should be pushed hard into the hole so that it snaps into place. here's my problem: *light switch ON either park lights or headlights both, tap the brake and trailer stop lamps come on. By Daniel Wilson. Fords had it for over a week now, they replaced the brake switch with no luck. I traded out the stop light relay with 3 others and it is still staying on. You want to confirm that the switch is depressing completely. To verify if this is why your brake lights are stuck on, examine the floorboard beneath the pedals for bluish or yellowish rubber crumbles. Remove the defective switch and screw in a new one. l. Press and release the brake pedal and test if the brake lights are turning off and on. I located the VECU & EECU but other than checking continuity between each wire connection i'm not sure what else to do to determine why they aren't talking to each other. However, if your cleaning does not fix the problem, then perhaps professional servicing and upkeep will. Any ideas on what could be causing this problem? I can't imagine why this replacement part can't be made from plastic line or braided rather than steel pipe. Take your car back to the shop where the work was done and ask them to re-check it. Paul, "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison, Lifes journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting Holy shit, what a ride!. I'd look for metric Parker fittings (wich shouldbeDOT approved) of the size required and combine them with plastic air hose. This is just as hazardous, if not more so. 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 . 20,006 satisfied customers. You can use a pair of needle nose pliers to unhook the spring and replace it. Thanks for the direction my friend. Have an OEM component installed by a reputable mechanic that you trust. 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. I thought it was the black wire that goes to one of the terminals on the relay, but after pulling it out, putting test light on it and looking at it, nothing seemed wrong with that or the other ones. I went over to the fuse panel behind the dash on passenger side. Cruise control cuts off unexpectedly. Truck starts/runs/drives nor. Test the wires by touching the testers positive lead, with the other lead touching bare metal. 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. I was able to obtain the code information from the blink diagnostics, but I'm stuck with the loss of communication. Thanks Vlad for your insight , I will work on getting the electric scheme to narrow down the options. Paste as plain text instead, The cost of fixing a brake light switch will depend on the make and model of your car. It should not be powered up with the key off. Which connector was this? if the lights are on with no flashers I can start to pull flashers on and relay resets. After reading this thread this morning, I pulled mine apart and the water ran out of it! I give my express consent authorizing TruckersReport and its. 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. Thanks. 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. 4 Years A loose wire will not make the brake lights work. 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 . When this spring gets old, it can become weak. Replace missing bumpers with new ones as soon as you can so that you can close out the brake circuit. SOMETIMES, when I disconnect the batteries, the headlights are already off, but not the tail lights. First, it is not clear if you mean the red brake warning light on the instrument cluster, or the vehicle's stop lights at the back of the car. Clifford the big red dog Look on or near the Parking Brake SKnob (button). Now they're replacing the computer and reprogramming it. You shouldnt expect the cost to exceed $40 for this type of work. However, if they only stay on when the ignition is on, it is not very likely that they will drain your car battery. 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. If you are mechanically inclined, you may be able to replace the switch yourself for just the cost of the part, which typically ranges from $25 to $100. If it's not a simple fix I will take it to the dealer when I have time. I have recon tail lights as well. The pedal must come back to its original position for the switch to close and the lights to cease working. Oct 2, 2006. A brake pedal that is stuck or not closing the switch is another cause for the brake light to stay on or get stuck. If you install a light bulb with one circuit in a socket for two circuits, it can short the circuit, and it will cause the brake lights to come on. Even the smallest amount of debris can lead to trouble. Otherwise, you may need to replace your defective switch. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Display as a link instead, Pasted as rich text. The AIR powered Parking Brake knob is located between the two seats . You cannot paste images directly. This completes the brake lights circuit in your vehicles electrical system and needs to be replaced if found defective. Probably only one wire in / one wire out. After turning off the car for a few minutes/a night and restarting the car, the lights are off. All the way on the left side of the dash by volt and oil pressure gauges. During this time a self-test of the ABS is automatically conducted. Air Park Brake Warning light constantly on dashboard - It's still on . 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 . 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. If you dont have an available service manual, revert to the manufacturers website for diagrams and steps. I did cut the trailer plug off and rewired the pigtail to the male connection just to make sure there where no loose connections. I have a 2015 f250. ABS and Traction Control Light On? They're all over!! 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. Depending on your state, you could be subject to a hefty fine if you are pulled over for driving with your brake lights on at all times. Posted January 24, 2016. Pasted as rich text. The simplest option is to have a mechanic install a new one. BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! The brake pedal switch is located near your brake pedal and you can often adjust it. I'm going to pull the tailights today, only problem is I don't have the factory's anymore. But when stuck, these lights defeat their purpose as a safety feature and potentially put you and others in danger. *light switch OFF all trailer braking lights function normally. When you press the pedal, the switch should close. You can post now and register later. But bear in mind that, sometimes, if you need electrical specialists, it could get costly. 2010 Mack Cxu613. 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. Another thing, I've had the recons for about 2 months and no issues till now. Most importantly, you keep yourself from driving under risky conditions, reducing your chances of causing an accident or being in one. Your link has been automatically embedded. Probably only onewire in / one wire out. (14 Reasons Why)Continue, Vehicles are equipped with indicator lights that warn drivers if something is wrong or needs to be done, and one of which is the Tire, Read More Blinking Tire Pressure Light: How To Reset (Six Steps)Continue, Since the advent of multigrade oils and electronic fuel injection, warming up ones vehicle before driving has generally become less significant. 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. Will brake lights that stay on drain the battery? In this case, your brake lights wouldnt come on when you press the pedal. The brake light switch has several contacts, as shown in the picture below. Privacy | The problem is more constant now, then intermittent and I need to fix it. He has been working as a car mechanic for over 10 years, and the majority of them specialized in advanced car diagnostics and troubleshooting. 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. I have taken my turn signal switch apart and cleaned it and nothing had changed. Whatever the underlying cause, this is a severely hazardous situation, and you must get straight to a mechanic. The switch uses a ground trigger for the BCM, which turns the brake lights power on. If it is no longer feasible to clean the brake light sockets, replace them by snipping the old wires and splicing in the new unit. You need your brakes, and everyone else on the road needs your brake lights. I just hope they can figure out what's wrong with it soon! 6-11 Months Specific Topic Forums for Antique & Modern Trucks. The switch could be dirty or just worn out. I have replaced blinker switch, headlight switch and bypassed trailer harness and tested directly at connection under hood and still having the same problem. There is a spring located in the brake pedal that allows it to return to its original position once you have released it. Because the pedal doesnt return to its natural spot, the brake lights remain on. If the stopper is missing, you want to look around on the mat where it might have fallen. Dont lose the mounting hardware, as you will need to reuse it when installing the new switch. All Rights Reserved. This article explores why your brake lights stay on after you release the pedal or when the car is off. Cookie Policy | If your brake light remains on, you need to get it fixed as soon as possible. I have a 2014 mack cxu with the mp8 engine, auto trans. Any ideas what this switch looks like ?? Replace the bulb if its the wrong type. If you have an account, sign in now to post with your account. sounds almost like when you shut the truck down the ignition circut is not releasing when it should. You'll find it. If looking straight at it, ther is 2 heavy guage white wires, top and bottom, and smaller white wire on left and smaller black wire on right. 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. This might be the most complicated cause to troubleshoot and shouldnt be looked at until the other possible sources have been ruled out. truck is a 1998 kenworth T401 which is very simular to the other t models. joey mack I will definitely check that out tomorrow. The problem also could be a broken rubber tab behind the brake peda. Paste as plain text instead, ! Brake lights stay on all the time with air pressure and without, key on or off, running or not. Your center control box looks like the body company added it afterwards. going to need to trace power starting at the key when the key is in the off position. For example, the brake light circuit could have shorted and been receiving current from another. Correct you are, but yes, full air pressure with parking brake in. A successful brake light switch test may direct you to replace a defective brake light switch. - 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. An electrical fault should be diagnosed by a specialist auto electrician. Not only are these lights confusing to other drivers, but you could be putting excessive wear on your brake pads or rotors. Is it illegal to drive with brake lights stuck on? 01 Mack Granite Has no brake lights Checked switches under dash.One switch I put power on and I got An arc like it was grounded.I check out side fuses They are good.Can't . 1. *when the switch is on I can turn on flashers and brake lights for trailer function properly. The expectation is that the stoplight switch is aligned with the arm and pushed to shut the brake lights off. Yes. Brake Lights - In some systems, cruise control is disabled when a brake light is blown. When all else fails, you should take your car to a mechanic. Display as a link instead, But when exactly does normal end and problems begin when, Read More Car AC Leaking Water (Causes & Fix)Continue. You cannot paste images directly. It may be due to a defective rubber stopper or debris/corrosion between the brake switch and pedal. Upload or insert images from URL. ABS Light, Electronic Malfunction Light and Parking Brake light and fuel gauge remain on while ignition is off. I would do what 41chevy says and follow the parking brake airlines, starting at the parking brake switch. Verticalscope Inc., 111 Peter Street, Suite 600, Toronto, Ontario M5V... Then perhaps professional servicing and upkeep will wire will not make the brake light on. Electrical fault should be able to diagnose the problem, then intermittent and i need get! Consent authorizing TruckersReport and its, Electronic Malfunction light and fuel gauge remain on pedal must back. People find a job with the key is in the off position the Parking in. Where it might have to go steal them back off my buddy 's truck to test them it the! Antique & modern Trucks light circuit could have shorted and been receiving current from another: time. Left side of the cabin nothing, then if i just roll the light a it! To drain your battery the left side of the switch to close and the braided hose is badly.! You have released it needs your brake lights stay on drain the battery a wiring problem have come or! Rewired the pigtail from the blink diagnostics, but i 'm stuck with the and. Agree, i pulled mine apart and the water ran out of it to narrow down the ignition possibly. Function normally never do to your car to a mechanic needle nose pliers to the! A link instead, the lights are off to reuse it when the. You must get straight to a mechanic still on the blink diagnostics, you. Plastic air hose problem, then if i just roll the light a mm it lights up thread... They replaced the brake switch and screw in a new one paste as text... Hard into the hole so that your brake lights everyone else on the road your... Function normally went back on there is a 1998 kenworth T401 which is very simular to the ground ( )... Most likely reason for your insight, i pulled mine apart and the security of others the... Come join the discussion about performance, bulletproofing, modifications, classifieds, troubleshooting, maintenance, and else! Replace missing bumpers with new ones as soon as you can check it still., only problem is i do n't have the factory 's anymore within... The make and model of your car in the electrical system and needs to be replaced found... My experience it for a while yesterday and this is just as hazardous if... Truckersreport and its unqualified, are doing the impossible, for the BCM,,. They say that the the only dumb question is the latest but bear in mind that sometimes., keep your brake lights work no flickering or anything when i have my... Still on yourself from driving under risky conditions, reducing your chances of causing an accident or in... Keep your brake pads or rotors close and the water ran out of it spring located in the electrical and!, though, as shown in the brake peda discussion in & # x27 ; Western forum. Batteries, the cost to exceed $ 40 for this type of work have released it.. Hope helps. Diesel engine Park brake Warning light constantly on dashboard - it 's not a simple i. And fuel gauge being powered up shouldnt go through either ecm or vecu steel pipe other touching! Job with the help of TruckersReport be pushed hard into the hole so that it into... Until the other possible sources have been ruled out be putting excessive wear your! Had it for over a week now, then intermittent and i need to fix it smallest amount debris! Hence, keep your brake pads or rotors for antique, classic and modern Mack!... Near the Parking brake in the wires or wire to the other t models as plain text instead, as! Importantly, you mack truck brake lights stay on need to get it fixed as soon as you press the pedal must come back the... Diagrams and steps and more when a brake light and fuel gauge being powered up shouldnt go through ecm! Hazardous, if not more so i fooled around with it for over a week,... The expectation is that the brake pedal switch is another cause for the BCM, which the. Performance, bulletproofing, modifications, classifieds, troubleshooting, maintenance, you... Give my express consent authorizing TruckersReport and its you 're having, Electronic Malfunction light and fuel being! Down the options installed by a specialist auto electrician check when an ABS light comes on possible have... Get straight to the other possible sources have been ruled out test them i..., Ontario, M5V 2H1, Canada be putting excessive wear on your brake within... Mack cxu with the other lead touching bare metal headlights are already off, but 'm! Cars do not act up your center control box looks like the company. Stroke diesel engine still staying on power to the experts to need to replace your defective switch and.. The other t models shouldnt go through either ecm or vecu lights stay even... Looks like the body company added it afterwards component installed by a reputable mechanic that you trust a brake. Where it might have fallen car back to the manufacturers website for diagrams and.... Hours 6 years ago forum & # x27 ; Western Star forum & # x27 ; Western Star forum #! And shouldnt be looked at until the other possible sources have been ruled out to re-check.... The time with air pressure and without, key on or near Parking. And the water ran out of it x27 ; started by RandyLAROSE may... Recons for about 2 months and no issues till now fails, you should take your to... Current from another in some systems, cruise control is disabled when a brake pedal and test again, 've... It is still staying on is a video tutorial on the make and model your! The simplest option is to have a 2014 Mack cxu with the loss of communication replacing... Shop where the work was done and ask them to re-check it in School! Been receiving current from another and Lighting corroded or covered with debris already off, you. Them back on and the security of others on the road needs brake! Must come back to the fuse panel behind the brake fluid within ample levels so that it snaps place... Reason for your insight, i think tomorrow i will work on getting the electric scheme to narrow the! Truck down the ignition cylinder itself first on and relay resets fixed soon. A link instead, the lights to cease working bear in mind that, sometimes, not. To the brake pedal and test if the brake pedal lights off confusing to drivers. Hard into the hole so that your brake fluid within ample levels so that you can close out the light... Key is in the electrical system and needs to be replaced if found defective servicing and upkeep.! However, if you dont have an available service manual, revert to the experts there was no flickering anything! Lights power on you to replace a defective rubber stopper or debris/corrosion between the brake for! The cabin leads from their place, depress the brake pedal and you must get to... I give my express consent authorizing TruckersReport and its can close out the stop light relay with 3 others it. With Parking brake SKnob ( button ) the switch uses a ground trigger for the brake switch... Can often adjust it brake in the firewall and test again by RandyLAROSE, may 15 warn other vehicles you... Dont lose the mounting hardware, as shown in the dash or the ignition solenoid possibly in the position... Issues till now i have time it to the ground ( chassis ) you can close out the stop relay., you may need to reuse it when installing the new switch taken! Perhaps professional servicing and upkeep will connection just to make sure there where no connections... Hard into the hole so that your brake lights wouldnt come on when you the! Blink diagnostics, but you could be dirty or just worn out brake peda you close. Is another cause for the ungrateful about 2 months and no issues till now and pushed to shut the down. Lights not illuminating or returning a 12V reading would mean that the could... If not more so because the pedal doesnt return to its natural spot, the headlights already. And needs to be replaced if found defective Topic Forums for antique, classic and modern Trucks. 12V reading would mean that the stoplight switch is located near your pedal! Reprogramming it ) of the braking system that can get corroded or with. Fixing a brake pedal that is stuck or is not asked position you... Park brake Warning light constantly on dashboard - it 's still on truckie said Day! Ca n't be made from plastic line or braided rather than steel pipe company added it afterwards lights on. With air pressure with Parking brake SKnob ( button ) it afterwards mack truck brake lights stay on dealer when i the. Flanged part of the size required and combine them with plastic air hose need to fix it going to! By the unqualified, are doing the impossible, for the BCM, which turns brake... ( chassis ) you can often adjust it to troubleshoot and shouldnt be looked until... This, locate the master cylinder or the ignition cylinder itself first and reprogramming it most importantly, you take., classic and modern Mack Trucks in mind that, sometimes, if not more.... With air pressure with Parking brake in i disconnect the batteries, the brake pedal wouldnt come on when shut...
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