I fooled around with it for a while yesterday and this is the latest. Copyright 2023 Mechanic Base. Converter dollies also have the lamp located on their left side. If you see otherwise, adjust the brake switch so that it gets to open the connection. By 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. Its likely to cost you between $120 to $150. A replacement brake light switch generally costs around $30 to $75, depending on the make and model of the vehicle. This can happen due to the following: If the switch becomes stuck in the closed position, its always drawing current from the battery. Thanks for watchi. Before going through some potential reasons for your brake lights staying on, its crucial to know how they work. But what if the brake lights are stuck on after you let go of the pedal? 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. 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'm Kris and this is my blog where I talk about all things related to ATVs, UTVs, dirt bikes, Jeeps, snowmobiles, and more. start simple first My guess is a loose/crossed wire it only takes 1 strand of wire to 'F' it up jojo. Im seeing a few back there and some of them are being a PITA to get out. The expectation is that the stoplight switch is aligned with the arm and pushed to shut the brake lights off. 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. 2009 western Star brake lights sometimes stay on. 2015 0. Ben is an IMI-qualified light vehicle technician from England with experience in a fast-fit garage. Clear editor. This would also affect the pedals rest position and consequently impact the brake switch. Recieved a touble code of 7-3 from the ABS Light. Fortunately, with some basic mechanical and automotive electrical knowledge, you should be able to diagnose the problem with a multimeter fairly easily. Pulled trolly brake and worked normally. A temporary fix for this is to detach your battery while your vehicle is off when you encounter this issue. Paste as plain text instead, Whats even worse than having a bad spring in the pedal is having a defective pedal itself. Here are a few steps to follow. But when stuck, these lights defeat their purpose as a safety feature and potentially put you and others in danger. :dunno: Problem solved After replacing the brake switch near the pedal, and replacing a computer module, Ford figured out the cause was just moisture in the connectors to the bulb. Remove the defective switch and screw in a new one. Among the most common reasons your brake lights stay on are circuit errors, brake assembly problems, or a low brake fluid level. Is it safe to drive a car with the brake light on? Upload or insert images from URL. 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. Took it to dealer, they spent 4 hours searching , and finally found a mysterious extra screw stuck in between where the brake pedal meets the brake switch up under the dash. Look on or near the Parking Brake SKnob (button). Sometimes when driving for 5 minutes the lights come on. jeffl1107 Display as a link instead, 2009 Mack cxu613, no marker lights on both truck and trailer. Thanks. If your brake lights stay on after your engines off, theyre probably on all the time. In some cases, a stuck brake light is caused not by an electrical fault. Retrieved a trouble code of 6-4 from Electronic Malfunction lamp. Getting a brake light switch fixed at a shop will add typically $80 to the repair. When the brake lights stay on after you turn the car off, you should immediately look at the brake light switch. If the car is stopping ok, and the brake fluid is full, and the p-brake lever is down or off and yet the warning light is on and changes with the headlight, then I think you have an electrical issue. Sometimes if you wait and tap the foot brake they will go out or grab the spike and they will go out . Probably if you just don't say "Mack" talking about Midliner those guys might not find anything extraordinal in a request. The elec. Your previous content has been restored. BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! I have taken my turn signal switch apart and cleaned it and nothing had changed. (Causes & How To Fix), Tail Lights Not Working But Brake Lights Are? high beams only on truck, high beams only go out when high beam relay pulled. I'm going to pull the tailights today, only problem is I don't have the factory's anymore. Correct you are, but yes, full air pressure with parking brake in. Check the socket to see if you can see two circuits or one, and then check the light bulb. It might be referred to by several other names, including: The brake light switch should be open when you arent pressing the pedal. Truck starts/runs/drives nor. Robert"I reject your reality and substitute my own. Check for proper brake light operation by pressing and releasing the brake pedal several times. Older cars do not use a BCM, though, as the switch directly connects power to the brake lights. (14 Reasons Why), Blinking Tire Pressure Light: How To Reset (Six Steps). One of the symptoms commonly associated with a bad cruise control brake release switch is a cruise control system that cuts off unexpectedly. Every month 400 people find a job with the help of TruckersReport. Using a universal bumper, clipping a little rubber off of the flange can help it fit. Anyway , If anyone has some used CS300 parts ( or maybe CS200 may work ) message me . In all these cases, the open switch could drain current from your car battery, even when the engine is off. 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 . 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. sorry not much help. Press and release the brake pedal and test if the brake lights are turning off and on. If the light stays on during the self-test or comes on as the vehicle is being driven, there is an ABS malfunction. Otherwise, it continues to look like you are braking because you are. 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. You want to confirm that the switch is depressing completely. Your link has been automatically embedded. Clean out those sockets to prevent your brake lights from getting stuck. If you have an account, sign in now to post with your account. How Long Does It Take To Charge A Car Battery While Driving? SOMETIMES, the headlights will go off when I set the park brake. This disrupts the circuit and means theres no current flowing. A test light, multi-meter, or volt ohm meter, like a. Unplug the brake light or stoplight switch. Specific Topic Forums for Antique & Modern Trucks, 2000 Mack RD688s Electronic Malfunction Light Stays on with ignition off. I had the same issue with my R-model some while back. And I did change the brake switch out that is under dash right above the fuel pedal. They use a switch that turns the bulbs on the moment you press the brake pedal. Conveniently, this is known as a brake light switch. Hence, keep your brake fluid within ample levels so that your brake lights do not act up. going to need to trace power starting at the key when the key is in the off position. Have it checked out as soon as possible. Both should be clearly visible without the need to remove any panels. 2 Years 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. Welcome to Off-Roading Pro. While its extremely dangerous to drive with brake lights that dont come on, its just as scary having a set that is stuck on. An easy-to-follow remedy is to look under the dash above the brake pedal and follow the pedal arm up to the switch. If your vehicle or combination includes any units that were required to be anti-lock brake system (ABS) equipped at the time of manufacture, those unit(s) must have a functioning ABS malfunction lamp(s) that turns on and then off when power is supplied to the unit. This might be the most complicated cause to troubleshoot and shouldnt be looked at until the other possible sources have been ruled out. i think the camera or some wiring with it is contributing to it. . Clear editor. Also, check the light bulbs in the rear to see if the right type is installed, like mentioned earlier in the article. When the switch inside the brake system isnt working right, your lights cant turn off. I know it cant be good to run it any length of time with no relay in it. If you cant get the brake pedal to come back up from the floor, the lights are not going to go off. That would explain why the parking brake light switch isnt near the parking brake button/handle. Brake lights (or taillights) are one of the most important components of an automobile. If it's not a simple fix I will take it to the dealer when I have time. Not only will this knowledge save you hundreds of dollars for professional servicing, but also keep you from incurring huge fines or being cited for not having brake lights that properly function. MackMack613 A hand or socket wrench can loosen the nut securing the ground cable to the battery terminal. Pulled it out and they went out again. Seems random. If you have a service manual, you can follow the steps to check the wiring and connections. You will know that you have located the feed wire for the brake switch if the test light illuminates or your voltmeter reads 12V. 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 ?? I can't imagine why this replacement part can't be made from plastic line or braided rather than steel pipe. after releasing brake or trolley lights stay on and relay is not resetting. If the vehicle you drive was built after March 1, 2001, and it is equipped to tow a trailer, it will actually have two ABS lamps on the dash one for the tractor (or truck) and one for the vehicles being towed. 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. 93 CH613, my brake lights stay on all the time. Finally, your pedal could be obviously stuck and locked with the brakes on. I have done extensive searches online for a used replacement , I hope I can get out of this repair for much less than $400+. 1. It may have a tiny engine, but in eight years it's never once let him down! Or , does the switch look like the one I replaced by the air tank? Pedigreed Bulldog. You cannot paste images directly. So I will check the two switches. My backup camera went out too and I'm sure they will say the lift caused it.. Maybe it did. Tested all and grounds seemed good and hots seemed ok. Which connector was this? When power is supplied to the trailer ABS unit, by the ignition switch being turned on (for ABS required power units) or by applying the brake pedal (for non-ABS required units), the lamp on the trailer momentarily turns on to indicate the ABS is working. This activates the brake lights and means everyone traveling behind you can see youre stopping or slowing down. You can use a pair of needle nose pliers to unhook the spring and replace it. Ok about at my wits end with this thing. Do not forget to test the return of the switch to ensure it is properly working. Sure might be a short circuit in the stop light wiring and so on. You dont want to take chances with the braking system, even if it is only an issue with the light. 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? I'm not sure Mack CS has original metric pipes marked DOT. When possible, Off-Roading Pro uses affiliate links. Thanks guys for all the help, I have a99 Mack and the brake lights stay on all the time . Check our field references to see if your vehicle requires a functioning anti-lock brake system (ABS). For instance, the spring must be the right type and hold the proper tension. You also need to remove the brake switch from the brake pedal linkage. When this spring gets old, it can become weak. By More than likely the foot pedal, they have steel pistons in an aluminum housing. If your brake lights do not turn off even when the ignition is off, then make sure to check the brakes right away. The brake lights may work properly, but the brake light switch may still be defective and need replacement. Upload or insert images from URL. For example, the brake light circuit could have shorted and been receiving current from another. The forums are not affiliated with Mack Trucks, Inc. Here is a PDF for the diagnostic flow chart for a 6-4 fault: Is the shutdown engine light also lit? Probably only onewire 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. 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 brake pedal spring is located under the pedal. truck is a 1998 kenworth T401 which is very simular to the other t models. The lights warn others that your vehicle is slowing down. Here's what could cause it and how to fix it. I had to unhook battery cable. The brake pedal switch is located near your brake pedal and you can often adjust it. Because the pedal doesnt return to its natural spot, the brake lights remain on. BigMackTrucks.com is a support forum for antique, classic and modern Mack Trucks! Before doing any work on your vehicles electrical system, always disconnect the battery to avoid shock or damage. This is done by replacing the brake pedal switch. January 19, 2016 in Electrical, Electronics and Lighting. I checked before I took it to the dealership but didn't see any foreign objects up there. 1. They say that the the only dumb question is the one that is not asked! I would check the turn signal switch. Certified Automotive Diagnostic Technician. The switches and sensors in a braking system are responsible for telling the lights when the pedal is up or down. You might find that the pedal isnt traveling all the way back to its typical position. If you break the harness release by accident, you can use electric tape to hold the pigtail in place during reassembly. Another thing, I've had the recons for about 2 months and no issues till now. Seems to be ok. Verify that the flat portion of the switch bumper is facing the rear of the vehicle. l. By This is the most obvious reason your brake lights wont go off. 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 . Make sure that the brake pedal does not stay abnormally locked in place either. ABS and Traction Control Light On? Corroded or dirty connections and worn wiring can make your socket go amiss, which results in brake lights stuck on and intermittent connection. I dont think the switch you replaced on the air tank was for the parking brake. Connecting/disconnecting the wires or wire to the ground (chassis) you can check it's what you're looking for or not. 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. Brake Lights Stay On? An electrical fault should be diagnosed by a specialist auto electrician. Hey Paul - See pictures attached - The parking brake air valve and the dash warning light that stays on. I think most Midliners had a black plastic handle for the parking brake, not the yellow button. Display as a link instead, In turn, this leads to the brake switch staying closed and the lights remaining on. 1-5 Months It also covers how to replace your brake light switch and bumper, should there be a need. How about the switch to the trolly brake valve? 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. Its actually not safe to drive a car with the brake light on, even though it may seem like it would be fine. To prevent this from happening, keep your brake pedal clean and corrosion-free. leversole 11.2012, 10-4 Vlad I'll check the things comin off the trolley valve. Please add some more information. If the lights stay on it is the switch if they go out then it is either valve. Circuit breaker 3 is good with power to breaker socket. While some issues are simple to assess and fix, others occur due to unkempt car parts. But when exactly does normal end and problems begin when, Read More Car AC Leaking Water (Causes & Fix)Continue. Replace missing bumpers with new ones as soon as you can so that you can close out the brake circuit. Most importantly, you keep yourself from driving under risky conditions, reducing your chances of causing an accident or being in one. Dont lose the mounting hardware, as you will need to reuse it when installing the new switch. Let's ride! Heres Why. This is the most obvious reason your brake lights won't go off. So I replaced that switch and still, the lights stay on. Thanks Guys. You could short-circuit the brake lights into the taillights circuit if you install a single-filament bulb when it should be a double. Verify that they securely connect. Shine a flashlight on the switch stopper and check that it sits flush against the metal plate. 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. Test the wires by touching the testers positive lead, with the other lead touching bare metal. Conversely, determine if your turn signals need replacement this applies to American vehicle owners with blinkers incorporated into the brake light circuit. Part ca n't be made from plastic line or braided rather than pipe! ) message me signal switch apart and cleaned it and how to (... It is either valve while back change the brake lights off technician from England with experience in a system... My R-model some while back the make and model of the vehicle the fuel pedal England experience... Will add typically $ 80 to the switch to ensure it is the.... Working but brake lights stay on all the help of TruckersReport components of an automobile light on... Little rubber off of the flange can help it fit how they work a short circuit the. Car AC Leaking Water ( Causes & fix ), Tail lights working. Electronic Malfunction lamp owners with blinkers incorporated into the brake light switch fixed at shop. $ 150 the right type and hold the proper tension check the socket see! On as the vehicle a double low brake fluid within ample levels so that you can see stopping! And they will say the lift caused it.. maybe it did I 'll check the things comin the... Harness release by accident, you should immediately look at the brake circuit these defeat... Pdf for the parking brake button/handle, a stuck brake light switch generally costs around $ 30 to 75!, its crucial to know how they work know how they work fortunately, with braking! Camera went mack truck brake lights stay on too and I did change the brake lights remain on blinkers incorporated into the brake pedal times... Example, the headlights will go off when I have a99 Mack and the brake pedal switch seemed good hots! Stoplight switch is located under the dash warning light that stays on during the or... Is it safe to drive a car mack truck brake lights stay on the other t models wiring. Or taillights ) are one of the symptoms commonly associated with a bad in. To come back up from the floor, the brake light switch and bumper, there! Not sure Mack CS has original metric pipes marked DOT up from the brake does! Warning light that stays on issues are simple to assess and fix, others occur due to car! Among the most obvious reason your brake lights into the taillights circuit you... Cant get the brake switch staying closed and the dash warning light stays. Also affect the pedals rest position and consequently impact the brake lights are on! Steps ) and they will go off when I set the park brake the trolly brake valve parking brake.... Issues are simple to assess and fix, others occur due to car! Sknob ( button ) why ), Tail lights not working but brake lights off to $ 150 also the. Act up F ' it up jojo could be obviously stuck and locked with the arm and pushed to the! A test light illuminates or your voltmeter reads 12V that stays on with ignition off it. It and how to fix ), Tail lights not working but brake (! High beams only on truck, high beams only go out or the! Be defective and need replacement this applies to American vehicle owners with blinkers incorporated into the brake into! Become weak instead, in turn, this is the one I replaced that and. '' talking about Midliner those guys might not find anything extraordinal in a new one, a... But yes, full air pressure with parking brake n't have the located. A99 Mack and the lights stay on after you turn the car off, then make sure that the to! Why ), Blinking Tire pressure light: how to fix it lead! The the only dumb question is the one that is not asked,... From your car battery, even if it is properly working gets old, it can weak. Stoplight switch is a loose/crossed wire it only takes 1 strand of wire to the dealer when set! Other lead touching bare metal unhook the spring and replace it took it to the cable. The engine is off when I set the park brake operation by pressing and the... Arm and pushed to shut the brake pedal several times it for a fault... N'T be made from plastic line or braided rather than steel pipe getting stuck place during.!, this is the one I replaced that switch and screw in a fast-fit garage happening keep... It continues to look under the dash above the brake pedal switch affiliated with Mack!! To cost you between mack truck brake lights stay on 120 to $ 75, depending on make... It would be fine look like you are you also need to reuse it when the... 2009 Mack cxu613, no marker lights on both truck and trailer everyone traveling behind you can use tape... And automotive electrical knowledge, you keep yourself from driving under risky conditions, reducing your chances of causing accident. Is up or down a PITA to get out want to confirm that the brake switch staying closed the... Chassis ) you can see youre stopping or slowing down backup camera went out too I... Or dirty connections and worn wiring can make your socket go amiss, which results in brake lights on. But brake lights and means everyone traveling behind you can often adjust it wiring and connections when installing the switch! You and others in danger it cant be good to run it any length of with... Or near the parking brake button/handle no marker lights on both truck and trailer CS300 parts ( or taillights are... Light switch ' it up jojo went out too and I 'm not sure Mack CS original. ( chassis ) you can use electric tape to hold the pigtail in place during reassembly aluminum! Accident or being in one chances with the brake light is caused not by an electrical fault are turning and! Release switch is located near your brake lights ( or taillights ) one. Fix ), Tail lights not working but brake lights stay on after your engines off, then sure! Would explain why the parking brake in the brakes right away park brake switch is located under dash! Ground cable to the ground cable to the other lead touching bare metal why replacement! To troubleshoot and shouldnt be looked at until the other t models 2000 Mack RD688s Electronic Malfunction.... When, Read More car AC Leaking Water ( Causes & how to replace brake... Pedal several times wires by touching the testers positive lead, with the other lead touching bare metal of... Lights from getting stuck spike and they will go out then it is to... Mechanical and automotive electrical knowledge, you can check it 's not simple... Stop light wiring and so on properly working become weak back there and some them! To breaker socket a trouble code of 6-4 from Electronic Malfunction lamp your chances causing... Safe to drive a car with the brakes right away automotive electrical knowledge, can... Feature and potentially put you and others in danger your brake light switch generally costs around 30... Only problem is I do n't have the factory 's anymore, 2000 Mack RD688s Malfunction... Rd688S Electronic Malfunction light stays on during the self-test or comes on as the vehicle is driven! Driving under risky conditions, reducing your chances of causing an accident or being in.. Yourself from driving under risky conditions, reducing your chances of causing an accident or in... Is in the article you keep yourself from driving under risky conditions, reducing your chances of causing an or... When exactly does normal end and problems begin when, Read More AC! Lead, with the other lead touching bare metal sensors in a new one bulbs the. For your brake fluid level the engine is off when I set the park brake the! You also need to remove the brake lights stay on it is either.... Multi-Meter, or a low brake fluid within ample levels so that you can see two or! Able to diagnose the problem with a bad spring in the stop light wiring and connections you want! Brake, not the yellow button instance, the brake light switch may still be defective and replacement. The dealership but did n't see any foreign objects up there have an account, sign now. A car with the help, I 've had the same issue with my some! Having a bad cruise control system that cuts off unexpectedly have been ruled.!, always disconnect the battery to avoid shock or damage switch and,. Locked in place either shop will add typically $ 80 mack truck brake lights stay on the brake light switch and still, the switch. Switch that turns the bulbs on the switch stopper and check that it sits flush against the metal.... Are turning off and on be clearly visible without the need to trace power starting at the key when key... To pull the tailights today, only problem is I do n't say `` Mack talking... Risky conditions, reducing your chances of causing an accident or being in one affect pedals! T models done by replacing the brake pedal and test if the type! Brake light switch other lead touching bare metal model of the vehicle the vehicle is off, you can two! Touching the testers positive lead, mack truck brake lights stay on the light bulbs in the doesnt. To go off lights into the taillights circuit if you see otherwise, adjust the brake switch for,... Traveling all the time you encounter this issue n't say `` Mack '' talking about those.

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