Fantastic video! We are having issues with the air drier on one of our trucks and I didn’t know much about them, now I won’t look like a newbie when the mechanic gets here!
Hi Crypto Gold - Thank you for your compliment. We're happy to hear we could help out. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hello Rick, I hope all is well! I just recently started the process for obtaining my AZ license. Having watched a few of your videos, I am quite impressed and appreciate the very well informed information you have provided. Wishing you the best. Cheers. Louie Burdi.
My air dryer was toward the front of the the truck by the front tire. After two or three Winters resulting in my air ride valves freezing up on the truck I decided to call Bendix and talk to an engineer. He told me without the new Adis system that do need approximately 27 ft of airline in order to get the hot air from the air compressor to cool down and fully condensate before the water gets to the air dryer so the air dryer would actually be effective in its process of removing the maximum amount of condensation build up. So I relocated the air dryer to the passenger side of the truck and moving back and extended the airline to approximately 20 ft. This resulted in a lot better results my truck did not freeze up in the winter and I had almost no moisture collecting in the first tank thanks to the engineers from Bendix
appreciate the efforts takin to bring these awesome videos to us new and experienced drivers! with so much going on the world day 2 day as a driver constant learning and refreshing is needed. awesome!
Hi Maurice - thank you for your comment. Yes, you are so right. It is busy for drivers and too few companies provide adequate professional development. You're ahead of the crowd by keeping yourself informed. If there's anything we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hi Emo Ray Torres - Thank you for your comment. And you are most welcome. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Rick is very good at explaining how things work. Why are my air tanks full of moister every day? I have a 2010 freightliner. I have reconditioned the purge valve, changed the filter, still full of water throughout the system. I drain the air tanks every day and they are full of moisture each time.
Hi Robert Rinaldi - Apologies for the late response. Thank you for your comment. Did you solve the mystery yet? Is the air compressor on you unit liquid cooled from the radiator system? That's the only thing I can think of. Is your vehicle fitted with an alcohol evaporator? There has to be a source of liquid some where on the system which is being drawn into the air brake system. That sound like way too much water. Let me know. All the best, Cheers Rick
Thanks for your response Rick. When I said the system is full of water, I probably should have said it's full of moisture. There is so much moisture than some of it comes out as drips of water. Anyhow, I think I have found the problem. Although I had reconditioned the purge valve, it is not purging properly. I must have put it together wrong. I'm going to take it out and have another crack at it and hopefully I will do it properly this time. Thanks again Rick.
between the engine's air compressor and the first air tank. The air dryer filters the air brake tanks so less debris gets into the air tanks. Even when there is an air dryer it doesn't mean the tanks will not gain more moisture. Emptying the air tanks DAILY will prevent any more moisture buildup and cause fewer problems.
I believe my air dryer is located on the driver's side of the engine compartment. I'm currently driving a Freightliner Cascadia 2014 with a DD13 engine. These air dryers are all over just have to know how they look.
I tan into a huge issue today. It’s mid summer so I didn’t have a freeze concern but I drained roughly 3-4 gallons from my water tank. What does water if that volume do to your brake system in summer time? Could it keep your brakes from properly releasing?
Hi iee4g6 - that's easy access my friend. Are you driving? I mean you're working as a driver and not going to truck driving school. All the best, Cheers Rick
On the Pete COE the air dryer is on the outside of the left frame rail at the back of the cab. On the Freight day cab the air dryer is in front of the right steer tire. On the NaviStar the air dryer is between the frame rails under the sleeper. On the old Freight the air dryer is bet
Hi Shaed Buech - Apologies for the late response. Thank you for your comment. That is where a number of these are located on different models and brands. Always happy to help. All the best, Cheers Rick
sorry for all the questions but it's a very interesting subject to me.........once more please about the one tank filling first and then the other............do the air lines supplying the primary and secondary tanks sense which tank has the lowest pressure and fills that tank first and then the other tank bringing them both up to 125 lbs. or is there some component in this system that i am not aware of. ? thankyou very much
Hi yard limit - Thank you for your comment and query. I'm not a 100% sure of this answer; however, I believe that the primary tank fills first, but only to about 90psi. The reason that the primary fills first is to give enough pressure to quickly release the parking brakes. Once the primary tank fills to approximately 90psi, then the secondary tank fills to 90psi, and then the system brings both tanks to maximum pressure. Saying that, most newer trucks aren't going to lose a lot of air overnight, so you're not going to notice an air loss of any significance - only if the vehicle has been sitting for a period of time. And yes, the governor is connected to the gauges that communicate air pressure in the tanks. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
two more questions please..........thanks for answering the first one............on the ADIS system why does one reservoir fill first and then the other. what causes this to happen and what is it about the newer air dryers that makes them superior so that they don't need the wet tank. thanks again.
Hi yard limit - Apologies for the late response. Thank you for your comment and query. The reason that one tank and fills and then the other doesn't have a purpose - it's just a feature of the ADIS system. And the reason that this system doesn't require a wet tank is because the newer air dryers are effective in ridding the air of moisture. And because moisture is no longer a problem, engineers eliminated the wet tank owing to sufficient volume of air in the primary and secondary tanks. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hi Thomas Varney - Apologies for the late response. Thank you for your comment. That's a common place for air dryers, and it's accessible. All the best my friend, Cheers Rick
Hi Ladonna - there are a wide variety of places you can find the dryer. So long as drivers can recognize it and it's not broken - all good. Too often I have students tell me they can hear the compressor or the governor, when in fact it's the air dryer purging. All the best, Cheers Rick
Hi RICHARD MOZE - Thank you for your comment. And what fun is it working on a truck if you don't get dirty. 80) If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
RICHARD MOZE Is ur air lines dry? Got same truck and have moisture all the time. When u drain ur tanks what gauge needle drips? My wet tank and primary tank connected
Great Job! Very good and clear explanation. Congratulations! - Question..I was looking for a Bendix Part Inspection Wall Chart for assistance on determining part failed due to contamination (warranty purposes). Thanks!
Hi Daniel Durang - Thank you for your comment and compliment. Did you have any luck finding the wall chart? If so, could you send me the link and I'll add it to the website. If not, I'll have a look around for you and see if I can find it. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Mine is under hood my prevost bus conversion is under coach ahead of series. Detroit it has wet and a and b tank and two gauges the governor is on the compression but my trucks are turn of century the have integrated system no wer tank school buses and most strength trucks under hood. Prevost have pull cords to drain tanks in engine compartment but truck have a drain cock on tank
Hi edwin eisinhauwer - Thank you for your comment and query. I've never heard of replacing the dessicant, but I would suspect it is something that is done every 2 or 3 years. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Your diagram shows an electric wire going to the purge valve. I have a '77 Gillig bus with a purge valve and an electric wire going to it. What is the function of that wire? You are an excellent teacher.
The air dryer should only purge when the system's air pressure reaches maximum pressure. The air dryer purging is trigger by this action, and this action only. All the best, Cheers Rick
Just wanted to add my two cents worth, I have a 2012 International Prostar and the dryer is located on the inside of the left (drivers side) frame rail under the cab rear of the transmission. It looks almost like a brake booster on a car with a large filter attached and lots of lines and wires coming and going.
Hi Scott - Apologies for the late response. Thank you for your comment and providing that information - that helps out the new drivers working toward a career as a truck driver. Is the governor within close proximity? If so, it is an ADIS system. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Well done Rick and I wonder where would these be located on a Transit bus something like a new flyer Xcelsior or Nova LFS something you might see in the streets of Vancouver or Vernon. I'm watching both car and cdl videos of yours
Hi EpicThe112 - Apologies for the late response. Thank you for your question. Just stand outside with the bus idling and listen for the air dryer when it purges. You'll find it quickly enough my friend. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
I greet him from Chile I have a question if the air dryer does not purge but the indicators reach 125 psi, where it purges. the truck is a Freightliner m2
Hi Dusan Masle - Thank you for your comment and query. Check the unloader valve inside the air dryer. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
I have a split gauge, - primary and secondary air gauge. One needle is orange, one is green. I would think there would be air pressure gauges for tractor and trailer, but the colors do not match the airlines. What am I looking at - what is this air pressure gauge telling me? which needle is tractor air? Which is trailer?
Hi Javier Amador - Thank you for your comment and query. Is it the air dryer or some other component in the air brake system that isn't working my friend? All the best, Cheers Rick
Hi Alphonse All - thank your for your comment. That information helps all the new drivers coming into the industry. If there's anything further we can do, drop us a note. All the best, Cheers Rick
Int 2005 cummins. Always have moisture in my air lines. Valves failing too often. I can find water dripping off my glad hands/ my red/yellow valve. I replaced my dryer, change filter every 18k miles, drain tanks every day. What am missing here? Thank you
Hi Ibrahim Naser - Thank you for your comment and query. And you my need to change the filter in the air dryer. Is it an older system with a wet tank or an ADIS system? If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Very informative. Lately my air dryer purge/sneeze in every 10 sec (air at 120 psi) and keeps on doing this during driving. What could be the cause?? Please help. International 4300 dt466 2007 make.
Hi Hs M - Apologies for the late response. Thank you for your query. There could be a bit of dirt in the purge valve at the bottom of the filter. Try blowing a bit of compressed air into the filter and see if that solves the problem. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Can a clogged air dryer filter keep the system from charging above 45 psi,?Bendix 800089. 2006 Columbia.Detroit. Traced the line from the compressor with soapy water, seemed OK. Air compressor is blowing fine, plenty of pressure and flow. Unloader and governor replacement a week prior to air build problem. Ran fine, with 3-4 minutes between purge.
Hi Charlie Abbot - Thank you for your comment and query. I would suspect a faulty governor. What was the reason you changed the governor? It's possible that it's a clogged filter, but not likely. All the best, Cheers Rick
Depending on your system it sounds to me like an unloader valve kit may be needed. There are two kinds of unloaders. One located in the head of the compressor. The other is in the dryer its self. If the unloader doesn't work right rather than being in the load or unload position its stuck between and can not build enough air. Unless the compressor is total shot it will pump air, and you just need to figure out why. A leak in the line coming from the compressor doesn't even have to be audible to prevent the truck from building air. I've had that happen on units with branded steel lines.
I have a 2010 Volvo 780.....my air dryer stopped purging so I bypassed it yesterday (Saturday) how long can I go without an air dryer?....I'm planning on going straight to Volvo after I get empty tomorrow
Hi Jungle Brother - Thank you for your comment and query. If you're going to Volvo tomorrow, I can't see you having any issues. After you change out the dryer, just drain your tanks and you should be good to go. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hello I'm in need of help... I'm seeking a compressor for a Mack midliner with a Renault engine... The compressor is a knorr bremse 75mm belt driven one but I can't get it anywhere ... Been looking everywhere for 3 years ... Can any other truck compressor be used ... Is there any other brand that is single piston and belt driven
Hey. I just subscribed to your channel doing a good job bro keep it up!. I have some clue but I just want to make sure To be on the safe side, I just have a quick question, how often are the air tanks supposed to be drained and also when you’re draining the air tanks On a Truck or trailer does the truck’s engine have to stay on running or off and also both brakes released and chalk the wheels, I know is off the subject Of this video but thanks in advance bro.
Hi imraan kamaal Ridwaan - Thank you for your comment. And welcome to Smart Drive Test. The air tanks are drained daily, daily, daily. And usually the engine is off when you're draining the tanks. Usually the first thing you're going to do is chock the wheels and release the parking brakes. Have a look at these videos for more explanation: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dMxilatT0qw.html If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
I was told to always pull the wire connecting to the drain cock on each air tank at the end of every or other working day on the unit unit to expel any moisture build up in the tanks for about 10 to 20 seconds. Is this still true for the new trucks.
Hi rob - thanks for your comment. Yes, that information is correct. I tell students to drain the moisture during fuelling. Air dryers are effective- so much so the wet tank has been eliminated on newer air brake systems. If there’s anything further we can do drop us a note. Always happy to help. All the best, Cheers Rick
Hi Chip Jackson - Thank you for your comment. Is 105 psi what's in the manual, or is it what's accepted by authorities? Most manuals that I've read all say 80 psi for the absolute minimum, but authorities all go with 105. All the best, Cheers Rick
Smart Drive Test I’m talking about governor cut out. Must be between 105-135psi. You mentioned that the maximum is between 100-135. The trouble with this is that if your maximum is 100 and if the governor is set at a 20psi range before cutting back in, with a 1900lb rated spring, your spring brakes are actually “beginning ” to apply by the time the compressor starts building air again. In B.C., your governor unload is to between 105-135 for this reason.
Hi Chip Jackson - Thank you for your response. And you're absolutely correct my friend. But just to confuse everyone, the manual states that the ABSOLUTE minimum that an air brake equipped vehicle's governor must return the compressor to the load phase is 80psi. It's on pg 161 of the old commercial manual. But you're right, here in BC, we pump down the 90psi and see if the compressor begins to load. And it's going to be tough to explain this to students, because when they take their test at ICBC, it's going to be looking for that 80psi number. All the best, Cheers Rick
Hi R3d33mingFir3 - Thank you for your comment. Where you took your test at that time may not have had you identify the air dryer, but now it is definitely something that you have to check as part of an air brake pre-trip inspection. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
rick, i promise,,,,,,my last question........not even sure if it applies since you are talking about air dryers,,,,,,but here it goes............with 2 tanks in the system ,,,,,,primary secondary.,,,,,when one tank drops below 90 lbs. and the other is full how does the governor sense ONE low tank and load the compressor to fill it. in your diagram i see only ONE governor sensing line from the primary tank back to the compressor. what am i missing here. sorry again for all the questions.
Hi yard limit - Thank you for your comment. Always happy to answer questions my friend. It is the pressure gauges - there is one on the primary, and one on the secondary tank. And due to the maximum and minimum settings of the governor, the system probably won't drop below 105psi before the governor begins to fill whichever tank is the lower setting close to that setting. There are series of valves and hoses, but simplistically speaking both tanks have to be at maximum air pressure before the governor will put the compressor into the unload phase. This video may help with understanding minimum and maximum settings of the governor and compressor: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dMxilatT0qw.html If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hi yard limit - Thank you for your comment and query. The reason that the governor is close to the air dryer in an ADIS system is because this system "combines the air dryer, purge reservoir, governor, and a number of the charging valve components in a single module." If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
rick , i still don't get it........whether you have an older system or an ADIS,,,,,,you still have a primary and a secondary tank.......when one tank becomes too low what is there in the system to tell the governor to load the compressor and fill the lowest pressurized tank. here's my problem'''''''''''''''if the primary system becomes too low and the secondary system is still full how can the low air pressure in the primary system tell the governor to load the compressor and pump air to fill the primary tank. i hope i made myself clear with my wording..........DOES THE GOVERNOR SENSE THE PRIMARY AND SECONDARY SYSTEMS INDIVIDUALLY AND IF SO WHAT COMPONENT IN THE SYSTEM ALLOWS THIS TO HAPPEN. THANKS............
Hi Don Tuttle - Thank you for your response. What kind of truck are you driving? If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hi Rick. My truck air dryer purges at normal pressure but once it cuts off it keeps purging . I've recently replace the metal cover hose from compressor to air dryer. Any advice please
Thank you for the informative video! I had a question however. I don’t drive my truck commercially (old military truck) but I will be modifying my intake system on my truck that will result in a higher moisture content. I do of course have a wet tank system and was wondering if the air could possibly keep up with moisture removal, and if not, would one of the newer air driers have a better chance? I deleted my aftercooled intake plenum in favor of a intake plenum shell that I will install water/methanol injection on, hence the higher moisture content. I will only be using enough water injection to keep my EGTs under better control.
Hi frezgi wol - Thank you for your comment. And you are most welcome. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
I have completed problem with my air break system. First tank are always 100 psi second 120 . Psi when i press break first ait break goes below 90psi . Also air dryer purges every 15 min or more sometimes i have to press break for making air dryer purges
Hi Abdou Shipping - Thank you for your comment and query. I suspect it has something to do with the unloader valve which connects that air dryer to the governor. You're going to have an ADIS system, so that's going to explain the difference in pressure of the the 2 tanks. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
@@smartdrivetest thank you very much for your reply sire. I replaced air dryer recently . And i took my truck to over 10 truck shops no one was performing to find the problem:/ ... now my air dryet purge every 6 min to 10 min ... if you are able to check my truck i will be more than happy. Thank you again..
Hi Abdou Shipping - Thank you for your comment. Unfortunately, beyond helping you to troubleshoot, I'm not going to be able to have a look at the truck. Have you tried putting the old air dryer on and see if it is still purging every 5-10 minutes. All the best, Cheers Rick
Hi Mack Anderson - Thank you for your comment. It might be the air dryer, but it doesn't make sense if one tank is filling and the other isn't. Did the technician give you a reason for the air dryer do that - causing one tank to fill and not the other? All the best, Cheers Rick
@@dgronzega8073 Thanks! So the heater keeps trapped water from freezing in cold ambient temperatures? I was thinking that there was some kind of moisture sensor there to tell the dryer to purge moisture because sometimes mine will purge repeatedly and get the compressor pumping again. A mystery to me. It mostly happens after we have had a good rain.
Hi Tony: apologies for the late response. Thank you for your comment. That is an interesting problem indeed. Are you any closer to solving it? All the best, Cheers Rick
my Purge Kit blew out the bottom of my air dryer. Taken along the Dome donut that locks it in, is that Dome donut replaceable? Also how can I bypass the air dryer in the meantime? 2012 freightliner. my air dryer is on the driver side in the engine compartment.
Hi Willie Robbins - thank you for your comment. That vehicle will probably have an ADIS system - is the governor within close proximity to the air dryer? If so, I don't think you can bypass the air dryer because you'll be also bypassing the governor and need that to control the compressor. And even if you could bypass the air dryer, it would probably be easier to fix the air dryer than to jury rig the air lines to bypass the air dryer. If the dome donut is part of the filter, than yes, it should be replaceable. My suggestion would be to talk to Freightliner - they will be able to give you the specific information. Thanks, Cheers Rick
Hi Shitlocks - Thank you for your comment and query. The air dryer's signal to purge comes from the governor. So if the system's purging in those short intervals, I suspect you have something wrong with the governor - that would be my first check. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
Hi jarrad mcdaniel - Thank you for your comment. And that is a very old truck indeed - 48 years old. Little wonder it doesn't have an air dryer my friend. All the best, Cheers Rick
Dear Sir, If animation would have been played by your side in the video, it would had been more effective. By the Way Thank you so much for the information
Hi Mani shankar Yadav - Thank you for your comment and feedback. And you are most welcome. If there is anything further we can do, drop us a note. Always happy to help. All the best, Cheers Rick
