Thank you sir. Another diesel tech here down in Florida. Abs and brake diagnostics always gave me problems. I saved your video so I can come back to it if needed. 🍻
Thank you. I'm a diesel mechanic and have seen this problem before. You did a great job in presenting and explaining the problem and steps it takes to diagnose the issue.
Congratulations Sir, excellent video, I am Truck's diesel mechanic and he just showed me something. It doesn't bother mechanics to tell us their ideas or knowledge But they are on top of us without letting us work. Thank you very much for your video and your excellent explanation. God bless you. From Dallas Texas to the order.
Thank you for this video, i have same truck with same issue and it was easy to repair because of your video. God bless you and have plenty of safe miles.
Knowledge is always good to know, I am also car mechanically inclined and I’ve been in the trucking industry for about 30 years now, I have my very own computer diagnostic equipment and I’m able to fix a flat to change the stem valve, etc., but I also highly appreciate you taking the time most people have a little crappy video about maybe five or 10 minutes 15 or quickly but I’ll tell you my brother you took your time to read and comprehend and I thank you for passing that knowledge on because I am at Owner operator I don’t expensive things could get out here I want to thank you, Robert from Fort Myers Florida👋👌👍✌️
good one mate! i took my 2014 powerstar in for problems the quote was stupid money ,got the truck back to the yard and over two weeks fixed all the faults,did what you did ,worked the problems out,i now have the leaking treddle you had,thanks a lot for your information .in australia it seems to be hard to find a good iveco fitter ,so yeah my hat off to you ,safe driving mate
thks buddy, you the only one explaining the air/ elect switch , l was lost also, l almost went down a hill in WV because of a leaking switch , please dont go down a mountain without a jake break , dont go down with air leaks, dont go down with bad breaks, make sure you adjust your breaks before you go down & do not go down if you got air leaks especially in the break system, otherwise you will wreck your life career, load freight & truck. Cant stop a run a way truck going down hill. Mountain driving is Serious business not like driving on level ground . It ony takes a minute to heat up your breaks to the point where you loose em
Glad it helped. Unfortunately very few of these technicians today don't diagnose. They just throw parts at the problem until they "find" the problem. Good luck and stay safe.
Very informative video. When you come to these types of mechanical diagnostics, normally, they are very costly, because as you said it on the video, those part changers that all they do is making you expend money on things you don't need. I have an issue right now, with my Peterbilt, and it might be a great video to start with. When I hit the brake on very cold weather, my brakes stay stuck down. and when I stop and delete the code by turning the key towards the opposite side, brake gets release. How I know it gets stuck down, because by troubleshooting, I turned all the truck lights off, and the stop light stays on both, trailer and truck. Or is either a brake release valve sending air back to the brake pedal valve, or the brake pedal valve is having a leak somewhere, that when it gets so cold it become icy. Since on hotter weather, above 32 degrees, brake system works perfectly fine.
That was a good video my man I’ve been driving for 13 years and I’m now studying and going to school to be a heavy duty diesel mechanic. I just got to this part of my lesson and wanted to know what it was and thank you for explaining all that.
Great video, I have a severe pressure loss when i press on my foot break when my trailer was attached. Changed the foot pedal valve and that seemed to work but now the leak is back again after attaching a trailer with a heavy load. My pressure gauage on the dash loses air immediately which is not safe at all. I can hear the air coming out as im pressing on foot brake. So after watching your video I hope i can check those delivery lines and see if one of the relays is bad. That was my next process to consider after researching and seeing if my relay valve was bad in the back. But maybe it is the same relay that you had underneath is the issue. I have an international as well so thank you for the video and taking the time to share this. Best of luck and keep rollin!!
Thanks for taking the time to make this video. I have the same Issue on a 88 frieghtliner dump truck. We already replaced the foot brake valve but thankfully we do our own work in house so we're not out a ton for labor. Hopefully this helps me to diagnose it quickly.
Repair videos are never anyone’s favorite, but I’m glad you still put them out there for us shade tree mechanics. This video helped me a lot, thanks for posting
This is awesome info. I have same truck same problem and same line Is feeding back. Can cover line and front brakes come on. Still leaking air out exhaust port so checking rear also. Thanks for taking the time to post this.
Well done !, you did a perfect video. I know , my 30th year in Air brakes. You got it spot on m8. If it was not the relay it could be your trailer control doing the same. Once again well done
Thank you very much. It makes me feel good that someone with experience in these systems would give such a great response. I have had alot of positive feed back on this video and really am glad it can help. Again, thank you.
@@JAYT76501 i my country 8 out of 10 mechanic can not succesfully diagnose Air system errors. I think its a pity that their training sometimes dont really involve air systems enough. Usually its an additional training program. You should realy try and do a basic training course. In your country Bendix would probable be the guys most likely that does the training. Its a three or 4 day course at max, but for a guy like yourself, you will ace it! I bet. God speed!
Thank you driver I'm having the same issue on my Volvo and couldn't find a single video or anything on Google about this issue... I've had the foot valve replaced twice money wasted 🤦🏾♂️ because that's what the shop diagnosed now I know what to check thanks to you
I hope this helps solve your issue. These parts ain't cheap and these shops need to train techs on proper diagnosis procedures so we aren't wasting time and money. Let me know how it turns out. 🤞
Really good to hear. There has been nothing but good responses on this video and I am really glad it has helped so many. Good luck to you and stay safe.
New to air breaks and you hit the nail square on the head . The answer to bleed back I found was a break can diaphragm that had gone bad causing the air to back track thru the valves to foot valve and leaking thru a line stabbed thru firewall. Parking break set or not it leaked plugging it off caused parking breaks to set if they were released. However the truck is also having an air dryer issue. Thanks for posting and helping out all the others with air break issues. Break on!!!
Can this cause an accident how dangerous is this because i think I have the same issue when push air brake it just shoots out air sound like left drive tire, the pedal, and some times from actually interior supply button
This video is vary helpful we need more videos on things like this I'm dealing with a air brake issue and this helped thank you . Be safe out there driver
Thank you. My truck only when I’m hooked with trailer when I apply food break hearing leaks from the dashboard. When break completely or push break all the way stop leaking only when slowly breaking and only when I have trailer, bobtailing no problem!
Awesome video...thanks for making it. I've got an issue with a horn type sound coming from the front when I press the brake pedal. Also my driver side steer seems like it's grabbing harder than the rest. Trying to diagnose what it could be and I stumbled onto this video. Not sure if it's my problem...but at least it gives me some ideas about how these systems work. Thanks again!
Thank you, you just helped me solve the mystery problem on my truck that I spend enough money on and nothing helped! Until I found this video!!! I guess today “so called mechanics” can only change oil and filters… if that 😆
Hey Brock, glad I found your video. I currently having I guess the same issue with my brakes. My biggest problem is my brakes appling themselves while truck is running & rolling down the road, where it looks like I am brake checking. If I am in the North it happens a lot when down South in warm temps it mostly applies the brakes at night driving or parked. I am goin to see if I can diagnose it the way you did. I have a 2018 international LT625.
Great video! Probably saved me a ton of money. My problem is slightly different. Air is leaking from that valve and my brakes are setting while driving. Now I believe I can properly troubleshoot the problem. Thank you for the video!!!
OMG this is an amazing video to learn from because my school bus is doing the EXACT same thing! This video perfectly describes and explains what my own problem is and exactly where I need to focus my attention to fix it. My damn brake relays. I wouldn't have thought of that either because I'm new to heavy duty trucks and air brake systems too. My school bus is a 1997 International 3800 full size, dog-nose school bus with the DT466E engine, AT545 transmission, and Blue Bird body. Now what I'll do is find the relay(s) that are toast, pull them, put them on my work bench and start taking them apart, going through them and inspecting them. It's possible that all they need is to be cleaned in some special way or lubricated or something simple. But at least I'll see where they failed inside and why they failed. I'll try to make a video on that too so others know. Thanks again for your great video Brock!!!
Same problem on 2019 peterbilt 579, did what u said and heard brakes ingage air was back feeding also when i checked that line. But my break lights are also staying on when i tap them. Have to turn truck off to make them go off
I am dealing with same problem, well not exactly.. my foot brake valve is leaking from the firewall which I and my mechanics determined by spraying it. Like you said that thing is like 600+ in dealer, and they dont even have it now. They gave me the part number and truck parts store ordered it for 270... looks kind of messy to get to it, i got 2015 international and it sure looks more difficult to get to than 2019.
Great video, I do have a question about each relay, for the front and rear. I did have air coming from the front orange line you pulled. Now I purchased the 3 axel one would the front relay under driver door be the same part as the rear ?
Sometimes if you put some air oil into the emergency supply it will take care of this issue. You have the emergency line leaking into the service side. Some huge companies that everyone knows about demand that you try this before replacing the relays. This is a very common fix before replacing a component. I guess I would try it before paying an arm and a dick for a repair. It takes very little time. You have to lube it where the supply goes into the relay. 11/16 and 13/16 wrench.
