If you haven't done any primary inspection I would point you out to the brake light switch wich might got stuck in "on" position. Among the most common causes of brake light problems is a burnt-out bulb. Pulled trolly brake and worked normally. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. i think the camera or some wiring with it is contributing to it. The switch for your brake pedal should be found under the dash, right by the pedal. 5+ Years, Please select ALL of your current, valid drivers licenses. By 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. Yes. 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. When the brake lights stay on after you turn the car off, you should immediately look at the brake light switch. When you release the pedal, a spring pushes it back to its resting position, and the switch opens. Turn signals or hazards do not function. Circuit breaker 3 is good with power to breaker socket. Brake lights (or taillights) are one of the most important components of an automobile. 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. Which connector was this? When the switch inside the brake system isn't working right, your lights can't turn off. 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 fix? Robert"I reject your reality and substitute my own. 2009 western Star brake lights sometimes stay on. Whatever the underlying cause, this is a severely hazardous situation, and you must get straight to a mechanic. You cannot paste images directly. //link to PDF Download a three-page flyer on understanding your vehicles ABS. Got be picking my hair out. The ECU might be malfunctioning to a severe extent. 20,006 satisfied customers. Either of these could be shorted or bad. Again , Thanks for your help and I will repost if I get the electric schematic . June 23, 2010 in Electrical, Electronics and Lighting. Youll pay next to nothing in terms of parts. Thank you! 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. The switch could be dirty or just worn out. Lights went out. A forum community dedicated to Ford F-series owners and enthusiasts with a Power Stroke diesel engine. The brake pedal spring is located under the pedal. Here are a few steps to follow. We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. You can use a pair of needle nose pliers to unhook the spring and replace it. This is done by replacing the brake pedal switch. Over time, this could drain it and make starting difficult. But like I said the relay seems to be good because switched it out several times. Check the socket to see if you can see two circuits or one, and then check the light bulb. However, this isnt a task that should be done without extensive automotive knowledge. If no luck, then you may be dealing with a non-working spring, a faulty switch, or a short in the brake circuit wiring. Magnus is the owner and main author of Mechanicbase. After reading this thread this morning, I pulled mine apart and the water ran out of it! Pasted as rich text. Thanks Guys. Truck starts/runs/drives normal. ! Lights not illuminating or returning a 12V reading would mean that the brake switch is not receiving power, signifying a wiring problem. 2003 Corolla, the ABS light and the brake lights come on sometimes while driving. If the flasher breaks or has any internal issues it can cause the lights to malfunction, or not respond at all when the turn signal lever or hazard light button are pressed . Similarly, a stuck wire will keep the lights on. Recieved a touble code of 7-3 from the ABS Light. tractor stop lights work as they should, its strictly on wires to trailer pigtail/. So I replaced that switch and still, the lights stay on. A loose wire will not make the brake lights work. Now that you are aware of the possible causes why your brake light gets stuck on, it will be easier to narrow down its origin and troubleshoot accordingly. In order for you to receive the best possible offers, please make sure your answers above are accurate prior to submitting. Probably only onewire in / one wire out. The forums are not affiliated with Mack Trucks, Inc. Perform a quick check of the brake lights, pedal and lines in between to ensure nothing has been affected by corrosion, leaves, dirt or other contaminants. Where is the switch located on the Midliner ? I have had this problem for about a year. Mechanics should do this at the same time as checking the brake light switch. Putting on eye protection is highly recommended as you go about locating your brake pedal switch, disconnecting the wiring pigtail, and inspecting it for damage. How Long Does It Take To Charge A Car Battery While Driving? Know where the ABS lamp is on every vehicle you operate and how to check that its working properly. I had to unhook battery cable. 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. I have recon tail lights as well. Heres Why And How To Fix, Tail Lights Not Working But Brake Lights Are? There could be other problems at play, too, dont forget. Using a universal bumper, clipping a little rubber off of the flange can help it fit. 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. I visually looked under the dash to see if anything had broken, heard quite a few people with other makes say there switch broke. 1-5 Months I know it cant be good to run it any length of time with no relay in it. leversole 11.2012. Each company we work with has specific experience requirements for their drivers. Even the smallest amount of debris can lead to trouble. The day time lights will come on and stay on, but then they stared to go . 1. Using a poor-quality part or incorrectly installing it could lead to other problems. I believe the switch requires air pressure to switch it offI say this because I usually have to have the brake pedal compressed for my described 'fix' to work. That would explain why the parking brake light switch isnt near the parking brake button/handle. Dont take chances with the braking system. I am now, to use a big word beyond my capabilities, befuddled! It might be referred to by several other names, including: The brake light switch should be open when you arent pressing the pedal. MTMACK50 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 . Two outcomes will occur when this happens either the brake lights are stuck on or not working. You also need to remove the brake switch from the brake pedal linkage. I have a 2014 mack cxu with the mp8 engine, auto trans. You should only take your car to see them once youve ruled out the above. Any ideas on what could be causing this problem? Pedigreed Bulldog. BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! A hand or socket wrench can loosen the nut securing the ground cable to the battery terminal. Blew it dry with air compressor nozzle, and dielectric grease.no more lights when key is off and my camera works again!! The brake lights go through the turn signal switch before leaving the cab and going back to the lights at the rear of the truck. Our 2014 crew cab lariat dually did the same thing brand new. If you break the harness release by accident, you can use electric tape to hold the pigtail in place during reassembly. A shadow of Vulva was somewhere about that either. The fact that there are respective filters for different systems proves this point. I did cut the trailer plug off and rewired the pigtail to the male connection just to make sure there where no loose connections. FYI- alot of this tubing is used in the engine compartment as well on my CS300. 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. To prevent this from happening, keep your brake pedal clean and corrosion-free. But when stuck, these lights defeat their purpose as a safety feature and potentially put you and others in danger. I've been disconnecting the batteries at night. . Brake lights that wont turn off when you remove the key from the ignition will drain your car battery pretty quickly. Retrieved a trouble code of 6-4 from Electronic Malfunction lamp. This test can be misleading. The stopper could also have come off or otherwise been damaged. In my search fora new replacement pipe and braided hose has resulted in about $400 for the two parts and the pipe comes straight and I'll have to get it bent to match the one pictured below. The fuel gauge being powered up shouldnt go through either ecm or vecu. When an ABS malfunction is detected during this test, the lamp stays on; otherwise, the lamp turns off after a few seconds. The number of times you pump your brake while driving and wear and tear can take a toll on your brake lights. Clear editor. Electricity can then flow to the three brake lights at the rear of your car (one on either side and one on the top). Press and release the brake pedal and test if the brake lights are turning off and on. Learn more on our about page. Or , does the switch look like the one I replaced by the air tank? Clean out those sockets to prevent your brake lights from getting stuck. 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