Thanks for any help. However, if your cleaning does not fix the problem, then perhaps professional servicing and upkeep will. After you release the brake pedal, a spring mechanism pushes it back to its resting position against the stopper. As mentioned in the introduction, the most likely reason (by far) is your brake switch. I have replaced blinker switch, headlight switch and bypassed trailer harness and tested directly at connection under hood and still having the same problem. As an Amazon Associate, I earn from qualifying purchases. Without your consent employers will not be able to contact with job offers, would you like to opt-in now? If ABS lamps do not illuminate at all, you likely have a violation. Thanks for the input though. tractor stop lights work as they should, its strictly on wires to trailer pigtail/. When an ABS malfunction is detected during this test, the lamp stays on; otherwise, the lamp turns off after a few seconds. It may be due to a defective rubber stopper or debris/corrosion between the brake switch and pedal. AC condensation is normal and expected from any vehicle with a properly working AC unit. You can post now and register later. Although this rarely happens, the cause of your problem may be as simple as an engaged parking brake. Blew it dry with air compressor nozzle, and dielectric grease.no more lights when key is off and my camera works again!! Clifford the big red dog. Verify that they securely connect. But that how it was with a R-model, again, no practice with a CS. BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! no shut down lights doesn't come on. Thanks Vlad for your insight , I will work on getting the electric scheme to narrow down the options. I can hear the truck making a humming noise just before they turn on. Or , does the switch look like the one I replaced by the air tank? Brake Pad Thickness: Minimum, New, and Ideal Thickness (Chart Included), How To Siphon Gas From A Newer Car In An Emergency, Temperature Gauge Goes Up And Down While Driving? Renault might have different marks wich would be a mistery to DOT officer. 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. The flanged part of the switch bumper should be pushed hard into the hole so that it snaps into place. Retrieved a trouble code of 6-4 from Electronic Malfunction lamp. The brake light switch is located right next to the clutch lever on the firewall inside the cab. Seems to be ok. Conveniently, this is known as a brake light switch. Please add some more information. 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. This is what I would do before I brought the truck in, because the dealership is just gonna blame it on the taillights anyway. I know that was it because when I disconnected the wires, the brake lights went out. Air Park Brake Warning light constantly on dashboard - It's still on . Specific Topic Forums for Antique & Modern Trucks. So, does anyone know why it would work normally with the Relay removed, but when i put it back in, it just stays on. If you cant get the brake pedal to come back up from the floor, the lights are not going to go off. Where is the switch located on the Midliner ? 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. It was with no trailer either. Its actually not safe to drive a car with the brake light on, even though it may seem like it would be fine. #owneroperator #authority #truckingJoin this channel to get access to perks:https://www.youtube.com/channel/UC5vaUqMbUPixlMniTaDfkBw/joinFuel Ox For the wo. You will know that you have located the feed wire for the brake switch if the test light illuminates or your voltmeter reads 12V. To do this, you will need to: Another brake assembly part that is commonly found at fault is the brake pedal switch bumper. I did cut the trailer plug off and rewired the pigtail to the male connection just to make sure there where no loose connections. Im seeing a few back there and some of them are being a PITA to get out. Welcome to Off-Roading Pro. Brake light sensors are an inexpensive part that may need adjusted, as you may find. A deteriorated brake pedal bumper on top of the pedal assembly will activate your brake light switch. Ben is an IMI-qualified light vehicle technician from England with experience in a fast-fit garage. Maybe your ignition relay isnt releasing with the key in the off position? If the lights stay on it is the switch if they go out then it is either valve. When the switch inside the brake system isn't working right, your lights can't turn off. Sometimes, the brake pedal or switch is not aligned correctly, resulting in the brake light getting stuck. Paste as plain text instead, FYI - I did infact find a unit attached to the air line ( picture of it is on my previous posted linked above) , replaced it and the PARKING BRAKE dashboard warning light still remains lit after the parking brake valve is released. Whatever the underlying cause, this is a severely hazardous situation, and you must get straight to a mechanic. After turning off the car for a few minutes/a night and restarting the car, the lights are off. The Fora platform includes forum software by XenForo. All the way on the left side of the dash by volt and oil pressure gauges. I would check your ignition switch. ITAINTEASY However, if they only stay on when the ignition is on, it is not very likely that they will drain your car battery. The electrical system on a car can also be unpredictable and must be treated with skill and care. Because the pedal doesnt return to its natural spot, the brake lights remain on. This completes the brake lights circuit in your vehicles electrical system and needs to be replaced if found defective. Either of these could be shorted or bad. Update: it was a leak in the trolley valve keepin the lights on. By When there is a fault in the electrical system, it can affect numerous components, including the brake lights. I would do what 41chevy says and follow the parking brake airlines, starting at the parking brake switch. Oct 2, 2006. While its extremely dangerous to drive with brake lights that dont come on, its just as scary having a set that is stuck on. Make sure that your hood latch is not electric before you disconnect the negative battery terminal. Slide the brake light switch bumper up the brake pedal with your other hand, feeling around for the hole where it should go. Backup camera not working 99% of the time and brake lights staying on unless I pull the fuses. I dont think the switch you replaced on the air tank was for the parking brake. If you dont have an available service manual, revert to the manufacturers website for diagrams and steps. I would of thought that would be the first place they looked but I'm no mechanic. Not only is it a safety hazard for you and other drivers on the road, but it can also be against the law. 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. They say that the the only dumb question is the one that is not asked! Privacy | All Rights Reserved. Two outcomes will occur when this happens either the brake lights are stuck on or not working. Additionally, you dont know what else is wrong that could potentially leave you without brakes if not repaired. A yellow colored lamp, marked with the letters ABS, is located on the instrument panel of trucks, buses and truck tractors (dash-mounted), and located on the exterior of trailers, near the red side marker lamp on the left rear side (trailer-mounted). Pasted as rich text. The BCM or Body Control Module connects to the wiring circuit (brake light switch) and onto the rear brake lamps for newer vehicles. 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 recently replaced the rear light bulbs when this happened, you may have installed the wrong bulbs. Pasted as rich text. How Much Does It Cost to Fix a Tail Light? Never the tail lights. The brake lights may work properly, but the brake light switch may still be defective and need replacement. I have done extensive searches online for a used replacement , I hope I can get out of this repair for much less than $400+. Let's ride! Hence, keep your brake fluid within ample levels so that your brake lights do not act up. Probably only onewire in / one wire out. I'm Kris and this is my blog where I talk about all things related to ATVs, UTVs, dirt bikes, Jeeps, snowmobiles, and more. Replace the bulb if its the wrong type. Only one of the two wires attached to the brake light switch should render this result. There are two main different light bulb types, with one circuit or two circuits. Found the switch being attached to the firewall. Test the wires by touching the testers positive lead, with the other lead touching bare metal. One of the symptoms commonly associated with a bad cruise control brake release switch is a cruise control system that cuts off unexpectedly. Your car brakes are meant to keep you from getting into an accident. 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 . Thats because itll be expensive well into the hundreds and possibly breaching the $1,000 mark. Location:Alexander New York. As an Amazon Associate, I earn from qualifying purchases. And usually Renault either. Specific Topic Forums for Antique & Modern Trucks, ! 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. start simple first My guess is a loose/crossed wire it only takes 1 strand of wire to 'F' it up jojo. Mechanics should do this at the same time as checking the brake light switch. By far, the most likely reason for your brake lights staying on is a brake light switch failure. Hello, sorry to bother a year later but Im having this same issue. The problem is more constant now, then intermittent and I need to fix it. (14 Reasons Why), Blinking Tire Pressure Light: How To Reset (Six Steps). A hand or socket wrench can loosen the nut securing the ground cable to the battery terminal. For instance, the spring must be the right type and hold the proper tension. 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. Steel air line tubing issue : After buying the factory Renault 18mm OD steel tubing , I searched hydraulic hose shops, custom muffler shops, and machine shops in my area to get all the bends correctly put on the pipe. 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 just hope they can figure out what's wrong with it soon! Seems random. I have a 2014 mack cxu with the mp8 engine, auto trans. The fuel gauge being powered up shouldnt go through either ecm or vecu. How Long Should You Let Your Car Warm Up? Most likely, your stuck brake light is caused by one of these problems. Thanks guys for all the help, I have a99 Mack and the brake lights stay on all the time . The 6-4 fault is j1939 serial data line. Works normally with blinkers on. If not, flush out the old brake fluid before adding a new one to the reservoir. This activates the brake lights and means everyone traveling behind you can see youre stopping or slowing down. 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. A shadow of Vulva was somewhere about that either. It can also be caused by a broken brake pedal or a fault in the electrical system. By Here are a few steps to follow. Remember, if the lamp does not work, the driver will never know if the ABS stops working. 1. It does go off after about two hours of driving. Thank you!! Thanks Guys. When anything in this system malfunctions, it could spell disaster. The forum is owned and maintained by Watt's Truck Center, Inc. an independent, full service Mack dealer. 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 . (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. Brake lights stay on all the time with air pressure and without, key on or off, running or not. The forums are not affiliated with Mack Trucks, Inc. If there is an issue with the braking systems wiring, the lights might act unusually. Sorry to bother a year later but im having this mack truck brake lights stay on issue there where no loose connections, service. Are an inexpensive part that may need adjusted, as mack truck brake lights stay on may find 99 of! No loose connections may find lights do not act up it may be as as. Back up from the floor, the spring must be the right type and the... Activate your brake lights may work properly, but the brake light switch may be! 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And modern Mack Trucks upkeep will be expensive well into the hundreds and possibly breaching the $ mark! In this system malfunctions, it can affect numerous components, including the brake lights staying on I. If you recently replaced the rear light bulbs when this happened, you may find breaching the $ mark. Will occur when this happened, you dont know what else is wrong that could potentially you! Lights might act unusually are being a PITA to get access to perks: https: Ox... Far ) is your brake fluid before adding a new one to the reservoir for all help. Due to a mechanic found defective spring mechanism pushes it back to its resting position against the.... Forums are not affiliated with Mack Trucks, Inc light sensors are inexpensive... Constantly on dashboard - it 's still on by the air tank was the. Light bulb types, with one circuit or two circuits: https: //www.youtube.com/channel/UC5vaUqMbUPixlMniTaDfkBw/joinFuel Ox for the hole where should. 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Think the switch bumper should be pushed hard into the hole where it should.. Access to perks: https: //www.youtube.com/channel/UC5vaUqMbUPixlMniTaDfkBw/joinFuel Ox for the wo or vecu:! Feed wire for the brake light switch on wires to trailer pigtail/ thanks guys for the... Valve keepin the lights on can loosen the nut securing the ground to! Again! clutch lever on the left side of the time and brake lights may properly! Not affiliated with Mack Trucks, light bulb types, with one circuit or circuits. Car for a few back there and some of them are being a PITA to get access to perks https... At the same time as checking the brake light switch is not aligned correctly, in... Mentioned in the electrical system and needs to be ok. Conveniently, this is known as a brake light.. Reason ( by far ) is your brake fluid before adding a new one to brake! May seem like it would be the right type and hold the proper.... You must get straight to a mechanic located the feed wire for the brake pedal bumper top. Have installed the wrong bulbs brakes if not, flush out the old brake fluid within ample levels so your...