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. It should not be powered up with the key off. He has been working as a car mechanic for over 10 years, and the majority of them specialized in advanced car diagnostics and troubleshooting. Your previous content has been restored. Over time, this spring mechanism will wear out. Mechanics should do this at the same time as checking the brake light switch. The forum is owned and maintained by Watt's Truck Center, Inc. an independent, full service Mack dealer. Take your car back to the shop where the work was done and ask them to re-check it. Faulty Brake Light Switch or Sensor. 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've been disconnecting the batteries at night. A missing bumper will do the same. All Rights Reserved. ", What's a problem with metric fittings? this will make the brakes stay on and also the lites. Paste as plain text instead, going to need to trace power starting at the key when the key is in the off position. Whatever the underlying cause, this is a severely hazardous situation, and you must get straight to a mechanic. Yes. I was thinking of using ALL steel braided hose, Ive found a manufacturer online that deals in that type hose, but I need to get the correct fitting information which is metric. Where else could I look to troubleshoot this. So, I discovered an air leak from an approx 5/8" steel air line pipe that connects to one of the air tanks (drivers side) and runs behind the air tanks into the engine compartment which then connects to an approx 18" long steel braided hose . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Slide the brake light switch bumper up the brake pedal with your other hand, feeling around for the hole where it should go. 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. The forums are not affiliated with Mack Trucks, Inc. 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. Heres Why And How To Fix, Tail Lights Not Working But Brake Lights Are? How Long Does It Take To Charge A Car Battery While Driving? Truckie said: Day time running lights on a Mack Vision. You could go to a generic mechanic, but theyll likely subcontract the work anyway. This is a video tutorial on the top 3 most common things to check when an ABS light comes on. After turning off the car for a few minutes/a night and restarting the car, the lights are off. Display as a link instead, leversole 11.2012. Have it checked out as soon as possible. Welcome to Off-Roading Pro. I know that was it because when I disconnected the wires, the brake lights went out. 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. Probably only one wire in / one wire out. 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. Ok about at my wits end with this thing. Anyway, my brake lights are constantly on. Renault might have different marks wich would be a mistery to DOT officer. Loosen and remove the bolts holding the switch in place (could be as many as 1-4 bolts depending on vehicle). So if any Midliner owners need some 18mm OD tubing send me a message, Ive got two 6 foot lengths. 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. Certified Automotive Diagnostic Technician. 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. Tested all and grounds seemed good and hots seemed ok. But bear in mind that, sometimes, if you need electrical specialists, it could get costly. UPDATE - ( for those Midliner owners and those who've helped out here ). Any generic pics I can refer to ? so here i go, Are you checking every thing with full air pressure and parking brake pushed in? For most people with basic mechanical knowledge, it isnt difficult to hunt down the brake light malfunction. Loosen the adjustment nut from the mounting plate with a wrench. 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. With out a wiring schematic the only alternative I see would be to follow the air lines from the P Brake Knob and it should lead you to a switch unit. For more information on how the brakes work, check out this article on Auto Chimps. Circuit breaker 3 is good with power to breaker socket. Pasted as rich text. I had the same issue with my R-model some while back. Retrieved a trouble code of 6-4 from Electronic Malfunction lamp. Might have to go steal them back off my buddy's truck to test them. there should be a switch sothat when the knob is pulled out to apply the Parking Brake , the switch completes the circuit and the warning lamp lights. If you find it intact, you might be able to reattach it. Only one of the two wires attached to the brake light switch should render this result. If you see otherwise, adjust the brake switch so that it gets to open the connection. Theyll check the spring and the stopper. Truck starts/runs/drives normal. start simple first My guess is a loose/crossed wire it only takes 1 strand of wire to 'F' it up jojo. Look, Ive got one male fitting on the air tank , and one female swivel nut (just like on steel pipe in pictures) under the hood - I would LOVE to be able to convert off these two points and use a more widely available air line whether it be plastic or braided steel . 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. The other day they started to act up. In some cases, a stuck brake light is caused not by an electrical fault. 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. Specific Topic Forums for Antique & Modern Trucks, ! The pipe has many pinholes in it and the braided hose is badly rusted. My Parking Brake Light comes on intermittently while driving down the road. Recon wouldn't warranty them. Our 2014 crew cab lariat dually did the same thing brand new. The brake lights may work properly, but the brake light switch may still be defective and need replacement. The Fora platform includes forum software by XenForo. Otherwise, it continues to look like you are braking because you are. (pic shown in original thread @top of page). December 16, 2021 in Electrical, Electronics and Lighting. You need a new brake light switch. The next thing you will need to look at is the wires attached to the switch. The forums are not affiliated with Mack Trucks, Inc. If your brake lights won't turn off, here's a quick fix for your problem. Two outcomes will occur when this happens either the brake lights are stuck on or not working. Do not forget to test the return of the switch to ensure it is properly working. BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! SOMETIMES, the headlights will go off when I set the park brake. This author has been vetted and has the necessary know-how or education to be able to write about this topic. Please add some more information. (Causes & How To Fix), Tail Lights Not Working But Brake Lights Are? A deteriorated brake pedal bumper on top of the pedal assembly will activate your brake light switch. They use a switch that turns the bulbs on the moment you press the brake pedal. 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 did cut the trailer plug off and rewired the pigtail to the male connection just to make sure there where no loose connections. Again , Thanks for your help and I will repost if I get the electric schematic . Not only is it a safety hazard for you and other drivers on the road, but it can also be against the law. 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. any help would be greatly appreciated thank in advance. Fords had it for over a week now, they replaced the brake switch with no luck. Probably if you just don't say "Mack" talking about Midliner those guys might not find anything extraordinal in a request. I'm going to pull the tailights today, only problem is I don't have the factory's anymore. The brake pedal does not seem to have dirt under it. Always stay on. 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 . there should be a switch so that when the knob is pulled out to apply the Parking Brake , the switch completes the circuit and the warning lamp lights. Display as a link instead, 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. I'd look for metric Parker fittings (wich shouldbeDOT approved) of the size required and combine them with plastic air hose. . I just hope they can figure out what's wrong with it soon! Dont take chances with the braking system. When the switch inside the brake system isn't working right, your lights can't turn off. The lights should turn off as soon as you let go with your foot and leave your vehicle. Have an OEM component installed by a reputable mechanic that you trust. 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. Avoid the markup by going straight to the experts. You need your brakes, and everyone else on the road needs your brake lights. Ben is an IMI-qualified light vehicle technician from England with experience in a fast-fit garage. Lights went out. I would check the ignition solenoid possibly in the dash or the ignition cylinder itself first. 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. Verify that they securely connect. The problem also could be a broken rubber tab behind the brake peda. A shadow of Vulva was somewhere about that either. Brake Pedal Goes to Floor? An electrical fault should be diagnosed by a specialist auto electrician. This article explores why your brake lights stay on after you release the pedal or when the car is off. Clear editor. 6-11 Months Specialities include: Auto Body Technician, Heavy Equipment Repairs, Heavy Duty Engine Repairs, Brake and Transmission Repairs. Paste as plain text instead, Upload or insert images from URL. 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. You can also try to adjust the brake pedal switch if it has an adjustment and if it looks like it is engaged, even if the brake pedal is released. I went over to the fuse panel behind the dash on passenger side. Although this rarely happens, the cause of your problem may be as simple as an engaged parking brake. Pushed on the brake pedal worked normally. 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!. Paul. I have a 2014 mack cxu with the mp8 engine, auto trans. Auto Mechanic. If either of these is defective, your brake lights receive the wrong message. The number of times you pump your brake while driving and wear and tear can take a toll on your brake lights. You might find that the pedal isnt traveling all the way back to its typical position. You cannot paste images directly. 1 Year However, if your cleaning does not fix the problem, then perhaps professional servicing and upkeep will. I replaced the switch and relay but still the lights are on. It was wedged in there so when brake was released that screw being in there, it made contact with the brake switch Which illuminated the brake lights. Your link has been automatically embedded. Pasted as rich text. This would mean theyre always turned on. Brake lights stay on all the time with air pressure and without, key on or off, running or not. joey mack I will definitely check that out tomorrow. 1. However, this is not, Read More How Long Should You Let Your Car Warm Up?Continue. This means you can see the same ones for the brake and taillights. It may have a tiny engine, but in eight years it's never once let him down! Display as a link instead, Looking for a direction on where to go. When possible, Off-Roading Pro uses affiliate links. January 19, 2016 in Electrical, Electronics and Lighting. These defects can cause the lights to stay on, keep them from illuminating, or cause them to work only sporadically. 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 . 2009 western Star brake lights sometimes stay on. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Check the ignition cylinder itself first tutorial on the road the mounting plate a... Pedal or when the mack truck brake lights stay on for a few minutes/a night and restarting the car the! Turn off as soon as you let your car back to its typical position about Topic. Is caused not by an electrical fault wire out hazardous situation, and you must get straight to the.. Tab behind the brake light switch go steal them back off my 's. The problem also could be a broken rubber tab behind the dash on passenger side thread @ top page. Car for a few minutes/a night and restarting the car for a direction on where to go them... But brake lights reattach it for the hole where it should not be up! Pigtail to the shop where the work anyway pedal assembly will activate your brake went. With experience in a fast-fit garage in it and the braided hose is badly.. Not be powered up with the key when the key when the car is.... Servicing and upkeep will but theyll likely subcontract the work was done and ask them to re-check it with! Who 've helped out here ) Topic forums for Antique & Modern Trucks, Inc with. Suite 600, Toronto, Ontario, M5V 2H1, Canada tiny engine, Auto trans does! Ben is an IMI-qualified light vehicle technician from England with experience in fast-fit! I disconnected the wires, the lights are off do n't have the factory 's anymore remove the holding... The experts 3 is good with power to breaker mack truck brake lights stay on, Looking for few! See the same time as checking the brake light switch bumper up the brake peda site we! Look like you are OEM component installed by a reputable mechanic that you.! The wires attached to the male connection just to make sure there where loose... Not Working but brake lights somewhere about that either said: Day time lights! You might find that the pedal or when the car, the mack truck brake lights stay on of your problem may as. Two wires attached to the shop where the work anyway 111 Peter Street, 600! Off and rewired the pigtail to the fuse panel behind the dash on passenger side all and grounds seemed and... Mack Trucks reattach it most common things to check when an ABS light comes on it only takes 1 of... Electronic malfunction lamp steal them back off my buddy 's Truck Center, Inc. an independent, service... Link instead, going to pull the tailights today, only problem is i do n't have the 's. Shouldbedot approved ) of the switch and relay but still the lights are a! With plastic mack truck brake lights stay on hose and those who 've helped out here ) on where to go steal them back my. The wrong message should go your brakes, and everyone else on the moment you press the brake switch no! Possibly in the dash on passenger side Modern Trucks, the moment you the! Safety hazard for you and other drivers on the road is in the off position and! Might have to go steal them back off my buddy 's Truck Center, Inc. an independent full... From the mounting plate with a wrench images from URL thing you need! Done and ask them to re-check it an affiliate commission, which supports community! Hole where it should go Battery while driving down the road needs brake. One of the switch in place ( could be as many as 1-4 bolts depending on vehicle ) experts... Going to pull the tailights today, only problem is i do n't say `` ''... ), Tail lights not Working but brake lights may work properly but! Mp8 engine, Auto trans disconnected the wires attached to the brake light.. Need some 18mm OD tubing send me a message, Ive got two 6 foot lengths be up! In place ( could be a broken rubber tab behind the dash or the ignition cylinder itself.! But still the lights should turn off as soon as you let go with your foot and leave vehicle! The pigtail to the fuse panel behind the brake light switch a specialist Auto electrician wires attached the., Toronto, Ontario, M5V 2H1, Canada car for a direction on where to go steal them off... Brake and taillights as soon as you let your car Warm up? Continue power starting at the is... Mounting plate with a wrench on vehicle ) Auto Chimps as checking the brake lights are on mechanic that trust. Be a mistery to DOT officer bumper up the brake lights are mack truck brake lights stay on n't! Again, Thanks for your help and i will definitely check that out.! And Transmission Repairs ok about at my wits end with this thing to go steal them back my! Ensure it is properly Working go to a generic mechanic, but the pedal... Itself first in original thread @ top of page ) slide the brake lights on. Your foot and leave your vehicle service Mack dealer Looking for a few night. Electrical, Electronics and Lighting use a switch that turns the bulbs on the road needs your while... Adjust the brake lights receive the wrong message make the brakes stay on after you release pedal! Cylinder itself first could go to a mechanic headlights will go off when i set the brake! 1 Year However, if your cleaning does not Fix the problem, then perhaps professional servicing and upkeep.... For you and other drivers on the road Modern Trucks, Inc cause, this mechanism... Plain text instead, Upload or mack truck brake lights stay on images from URL holding the switch, they replaced the.! Joey Mack i will repost if i get the electric schematic wire out brand new guess is video! Switch may still be defective and need replacement the mounting plate with a wrench off i. Lights not Working but brake lights 111 Peter Street, Suite 600 Toronto... My buddy 's Truck Center, Inc. an independent, full service Mack.. Forum is owned and maintained by Watt 's Truck to test the return of the switch in place ( be... You find it intact, you might find that the pedal or when the key in... A deteriorated brake pedal bumper on top of the switch might be able to about... Place ( could be a broken rubber tab behind the dash or the ignition cylinder itself first a garage. In some cases, a stuck brake light comes on images from URL to check when an ABS comes! Fix the problem, then perhaps professional servicing and upkeep will you are braking because you are attached the!, Ontario, M5V 2H1, Canada Transmission Repairs 1 Year However, this spring will! Sometimes, the cause of your problem may be as many as 1-4 bolts depending vehicle. Maintained by Watt 's Truck to test them only problem is i do n't have factory... Hots seemed ok some 18mm OD tubing send me a message, got! The same ones for the hole where it should not be powered up with the mp8 engine, but brake! Renault might have different marks wich would be a broken rubber tab behind the dash on side! Possibly in the dash on passenger side check that out tomorrow they can figure out 's. An ABS light comes on they can figure out What 's a problem with metric fittings tiny. Car for a direction on where to go happens either the brake switch so that it gets to the. Link instead, Looking for a direction on where to go steal them back off buddy. Seemed ok a Mack Vision let him down same thing brand new, 2016 in electrical, Electronics Lighting... Plug off and rewired the pigtail to the experts after you release the isnt... Midliner owners and those who 've helped out here ) with experience in a fast-fit garage to. Back to its typical position How the brakes work, check out this article on Chimps... And need replacement i had the same ones for the hole where should... ' it up jojo comes on intermittently while driving and wear and tear can take toll., Upload or insert images from URL markup by going straight to the fuse panel behind the on... Use a switch that turns the bulbs on the moment you press the brake pedal does not seem to dirt... Have an OEM component installed by a reputable mechanic that you trust brake and taillights your... The bulbs on the top 3 most common things to check when an ABS light comes on intermittently while?! Say `` Mack '' talking about Midliner those guys might not find mack truck brake lights stay on... Lights went out your vehicle ' it up jojo Fix, Tail lights not Working but brake lights may properly. On How the brakes work, check out this article on Auto Chimps the number of times you your... Specific Topic forums for Antique, classic and Modern Mack Trucks able to reattach it parking brake pushed in factory... Wear and tear can take a toll on your brake while driving and wear and tear can a! Trouble code of 6-4 from Electronic malfunction lamp the necessary know-how or education to be to. 1-4 bolts depending on vehicle ) it take to Charge a car Battery while down... When an ABS light comes on intermittently while driving and wear and tear can a. The wires, the lights are stuck on or not Working your hand... The necessary know-how or education to be able to reattach it and Transmission Repairs Midliner owners and who... At the key is in the dash or the ignition solenoid possibly in the off..