Air Brake Relay - How it Works. Air braking systems and Commercial vehicles

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A more detailed look at the air braking system, in particular with this video at the air brake relay.
Relays are fitted to an air braking system for larger vehicles to speed up the application and release of the brakes, minimising brake lag, which is the time it takes between the driver operating the controls (park brake/foot brake valve) and the action actually happening at the brakes.
For a bit more background before watching this video, take a look at our "introduction to air brakes" • Air Brakes - An Introd...
If you like what you see hit the like button, and if you would like to see more subscribe to Educational Mechanics here: www.youtube.co...
Visit our website for a larger collection at: edumech.co.uk

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29 сен 2024

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Комментарии : 265

@frankrizzo5659 4 года назад

I'm a mobile 24 hour diesel mechanic here in Michigan America....I've watched one video and I'm already hooked.... already subscribed on to the next videos lol....thanks keep up the great work my English brother....Britain and America... boyfriend girlfriend FOREVER lol

@c.a.mcneil7599 5 лет назад

Thank you for this great video. You must have spent a lot of your valuable time making it.

@Gary-ld6ht 5 лет назад

Very good explanation-you made it very simple and easy to understand

@CyberDevNet 5 лет назад

This satisfies my curiosity of that air below vehicle blown on the road. Exhaust... Air released from delivery pipe line. Thank you.

@driverbank6563 3 года назад

Fantastic explanation and illustration. Great video!

@EducationalMechanics 3 года назад

Thanks. 😉

@toddjensen692 2 года назад

That was easily understood, thank you.

@matthewdinola1422 3 года назад

Fantastic Video. Thank you so much

@ShubhamMishra-ed7mb 7 лет назад

wow , you explained it in so nice way , i can do better tomorrow in my exam, thankyou

@EducationalMechanics 7 лет назад

Thanks Shubham Mishra, good luck tomorrow.

@ShubhamMishra-ed7mb 7 лет назад

Thank you sir , i've watched lots of your videos that would be very helpful , thanx a lot

@Bestbuilt04 10 месяцев назад

Compresses air goes through the air dryer first, not the supply wet tank. You missed that

@aLeXpInKhOuSe 10 дней назад

Спасибо , за видео очень информативно и полезно!

@scottsigley3550 Год назад

EXCELLENT VIDEO

@sam111880 6 лет назад

very nice video cleared up the lag issues i was concerned about in air brakes as well as where the sound is coming from when air is released out the exhaust port when you let off the brake pedal as well as the brake button/throttle's on dash. Its this simple relay component that i over looked. The relay is an important components :)

@truckcaretv8649 Год назад

Good 👍

@monique2135 7 лет назад

Fantastic video we need more

@Juliamalave8989 6 месяцев назад

Great job

@josueramirez7990 5 лет назад

Its a pretty good video i know for dumies it would be nice to explain how is the air going from the supoly through the bolt/inlet valve into the brake delivery

@cristianwaty6966 4 года назад

Thanks for Teaching And God Bless

@dsbohra 7 месяцев назад

Good job.

@RAILWAYNEWUPDATE 5 лет назад

Nice

@lexusry 6 месяцев назад

ON THE TEST QUESTIONS, DOES 2000 FLATBED TRUCK REQUIRED THIRD OR TOP BRAKE LAMP ASSEMBLY

@technotechnician2666 3 года назад

Good video

@OTOKAYAChannel 2 года назад

Pembelajaran yang sangat bagus👍🙏

@lexusry 6 месяцев назад

ON THE EXAM TEST QUESTIONS, WHAT IS THE MAXIMUM AIR PRESSURE LEAK ALLOW , 3,5,10,OR 15 PSI.

@charlieabbot3649 4 года назад

Well done.

@mig_21bison 5 лет назад

Nice... And the music by mouth was also very good👍

@EducationalMechanics 5 лет назад

Thanks Rahul 😀

@gurjindershoker6681 3 года назад

thinks bro god bless you think

@henokhenok3984 5 лет назад

Omg i cant understand your english.. but can you please tell me how the brake air valve works ....and great job

@EducationalMechanics 5 лет назад

አመሰግናለሁ Thanks. We also have this video which shows the valve working with no words or narration. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-afyM_k9krRw.html

@johndavidson4128 3 года назад

What's the valve called that keeps air in the bags when you drop the trailer?

@Teddy_Bass 5 лет назад

Nice channel mate

@2006ryde2006 6 лет назад

I’m a diesel mechanic in Canada and the trucks I work on use the air to release the brakes so no air means your brakes are “on” and the pedal releases the pressure in the air pot where a large spring extends a rod that pushes on a ratchet and rotates the s-cam rather quickly. Does this system not exist elsewhere?

@EducationalMechanics 6 лет назад

Hi Mario, that sounds like an old spring chamber. You might find them on their own in some really old vehicles as the service brake (brake pedal), I've seen a few vehicles that have those chambers just for the park brake but not as a service brake. Spring chambers are a good fail safe, as if you lose your air they will apply themselves. Most trucks now use spring brake actuators, which is a spring chamber and a service air chamber in one unit.

@omarboumuhammadalhamdoulil4410 5 лет назад

Thanks

@SK.The-Machine-Designer 4 года назад

superb 1👍👍

@JazzyJasTruckingzz 7 лет назад

Great video! Can you tell me why do some air brakes squeak when you release the brake pedal? Like the ford ones for example

@stanpatterson5033 7 лет назад

Some relay exhaust valves have different designs, and some may make a sound like hissing or lots of air rushing through an opening. Some make a sound not unlike a musical note, although that is not the intention of the manufacturer. Just like different tires would make different sounds on the driving surfaces, release valves make different noises as the air exhausts out through the ports. Some sound like a sneeze, some sound a bit like a musical instrument.

@candrevajonathan-matic6604 5 лет назад

Thank u sir.

@terrellscaife2411 2 месяца назад

Cool

@baghlan2243 5 лет назад

How to we strong air break truck .. . I have a truck car that we repair all of things to changed new . But don't have any break to stop the car what we do about this truck . Please aware to me.. thanks..

@andrewmunaki136 6 месяцев назад

WHAT BE THE PROBLEM ON MY TRUCK IT DELAYS TO STOP WHEN PRESS THE BRAKE PEDAL DOWN

@tefosello2357 3 месяца назад

Rear wheels or Front Wheels? Firstly make sure you have no air leaking somewhere in any of the circuits If it's the rear wheels, it's the faulty relay valve on the primary circuit (foot brake valve Circuit ). If front wheels, its a faulty quick release valve. They cause brake Slag

@arghyadutta9091 3 года назад

👍

@heatherbrown7663 3 года назад

~+~+~+~+~+ GREAT VIDEO. THANKS! ~+~+~+~+~+~+

@hamdiosman952 3 года назад

Astra iveco dump truck air compressor over heat what the proble of output air heating

@EducationalMechanics 3 года назад

not sure I understand. Hot air in the system is never great but depending on your setup it may be cooled before it's used. Engine driven compressors will get hot just because of where they are, but your piping and reservoirs should be able to dissipate the heat. Although, if you've got some big leaks, this will make the system work harder.

@leonabiecamarin1797 6 лет назад

number 1 .ahehehe

@daianaxi1295 2 года назад

That damn accent made it so fucking hard to understand 😓

@5wh1 3 года назад

I don't know how to thank you, sir! You nailed this extraordinary air brake relay video down to the science. Excellent devery style and methods to my mind's taste buds. I was blind about this concept, but you made me see! Once again, thank you and may God bless you!

@vincesmith5846 2 года назад

Yes! Very good video!! Thanks

@iordnbrun5498 3 года назад

This is the clearest explanation and visualization of air brake systems that I've ever encountered. Thank you!

@EducationalMechanics 3 года назад

You're very welcome, thanks for watching.

@VivekAnandJ 5 лет назад

This was just awesome! I LOVED the "tu tu du..." part. Reminded me of one of the most epic stand up comedians I know, Eddie Izzard!

@EducationalMechanics 5 лет назад

I love Eddie Izzard!

@kr09876 5 лет назад

2:29 made my day

@kwunmeichan8013 2 года назад

I have watch your video about the quick release valve. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-b04oTJGDF9I.html I have realized both quick release valve and relay valve have exhaust ports. Are the functions of these two type of valves overlapped?

@EducationalMechanics 2 года назад

Hi. The functions are slightly overlapped, although the way they operate are slightly different. Both valves will speed up the release. But on that, the relay uses a signal pressure to operate and is designed to speed up application and release at a distance far from the drivers controls, where the QRV is inline and operates with the full volume of the delivery air (not using a signal line). I hope that helps.

@tankosl 7 лет назад

Great video!!!!The simple graphics make the principles much easier to understand.....thank you very much!

@EducationalMechanics 7 лет назад

Thanks Mark. It means a lot to us.

@1963BirdDog 6 лет назад

Thanks for taking the time to put this together. Great explanation, graphics are a big help.

@EducationalMechanics 6 лет назад

Thanks BirdDog, glad it helps.

@pavankn88 5 лет назад

Very nicely explained & the sound you make in between daa daaa makes me laugh. Keep it up. Thanks for the video. Namaste

@colerobison6916 5 лет назад

This is EXACTLY the information I was looking for. Thank you!

@dhxl 4 года назад

How is signal pressure controlled? Yes, you use press the pedal, but then how the system knows how much signal pressure apply?

@EducationalMechanics 4 года назад

Hi Igor. The drivers brake pedal is actually a proportional valve. The brake signal pressure is directly related to how much force the driver applies to the brake pedal and the "foot control valve". I've had a break for a couple of years, but the foot control valve is one of the videos I hope to be making soon. I hope this helps.

@pedrodamianmartinezcastane5199 5 лет назад

Hola soy de México me gustaría ver y escuchar el vídeo en español gracias

@troy3509 2 года назад

Fucking awesome narrating thank you

@williampatrickfagan7590 8 месяцев назад

Let it be noted that air brakes are designed to fail safe. IE if NO air is available ( burst hose) the spring will apply the brakes. There is also the dead man's brake. That is a brake that can apply brakes to the trailer only if it is Jackknifing. Usually fitted to specialist vehicles such as recovery trucks.

@henrytwigger2245 6 лет назад

This isn't the modern two line disk breaking system used on modern European articulated lorries, is it ? These don't have a separate park break line do they ?

@squangan 24 дня назад

Interesting. I’ve never seen a hand control valve of that style for the spring brake release before, just dash mounted popoff valves here in NA.

@darkwolfe6986 2 месяца назад

Dodododo and the aargh made me laugh 🙃

@localcrew 3 года назад

Great video. Just subscribed!

@omaradan8062 6 лет назад

Thank You Sir, Great Observed Good Idea Video Channel I love this post to learn more about

@johannap6252 Год назад

Thank you so much for this video! Very well explained. I just discovered your channel and am looking forward to watching more of your educational videos!

@TheSuperKnug 6 лет назад

Im soooo happy that ive found you! You could not beleve how much easier my studies are now! Thanks again!

@ramakrishnan6913 2 года назад

How can the pressure on the top and bottom side of piston can be same. I think the pressure at the bottom of the piston should be equal to pressure of the air in the supply line from reservoir. Pl clarify

@story9139 4 года назад

A air brake system vehicles,has need any brake oil? If has need it, but why.....please tell me.

@ramakrishnan6913 2 года назад

pl refer to the video at timing 6.28 min. Is the pressure in the service brake chamber, top and bottom of the piston is it same.

@DellAnderson 3 года назад

Superb explanation. Someday (if you like) would love to see a similar video for DD3 (bus, non-spring brake) brake systems. Thanks.

@truckcaretv8649 Год назад

Good 👍

@edmourgagnon1504 Год назад

Wooooo. Slow down mate. Easy to see that you know your stuff. But remember... good teachers speak slowly enough so that everyone will understand. This is not a race... 10/10 for the graphics!

@Kevin-ip8uf 6 лет назад

lol, I'm an instrument tech looking for information on pneumatic relays and this was the best video I could find to explain it. well done

@EducationalMechanics 6 лет назад

Thanks Kevin 😀

@akoj3262 3 года назад

I love this kind of straight forward video and they really takes a lot of theory and time to do this kind of video! Thank you SOOOOOOO SOOOO MUCH! Have you moved on in life and so never upload since 4yrs ago? :P Wish u good life and happiness in whatever you are doing

@EducationalMechanics 2 года назад

Hi. I’m still here. I’ve got a few more videos to make. I’m just really busy teaching. Thank you for your kind words. :-)

@SwampDonkey225 2 года назад

I'm about to start the journey of studying every one of your videos.

@okiemuteemoefe8766 Месяц назад

One misconception people have about airbrakes is that "Air presure" activates the brakes. As a matter of fact, it is the other way round. By default, the beakes in an airbrake system are already activated without airpresure. Cos the brake actuator is actually powered by a set of very powerful springs. So when you start your engine, airpresure build up to the desired guage and when you release the parking brakes, air presure goes into the actuator and releases the brakes. and that's when you can move the vehicle. Now, what happens when you apply the service brake, is that you are releasing air presure from the actuator which in turn allows the springs to activate the brakes.

@softwarephil1709 23 дня назад

I’m sorry, but that’s incorrect. You are right that the parking/emergency brake is applied by spring pressure and held off by air pressure. That’s why it is called a “spring brake.” But the service brakes work the other way: they are held off by springs and applied by air pressure. Loss of air pressure will stop the vehicle because of the parking brakes, but air pressure is needed to operate the service brakes. There is a good series of videos by Bendix about this. Railroad trains apply air pressure down the brake line to release the brakes (and charge a reservoir on each car), and they reduce the brake line pressure to apply brakes.

@matbarsingh1957 3 года назад

Air brake sys troubles shooting ke bare main vedio banao kyaa problem ati hai jaam ka

@atreaunormandy9827 2 года назад

Great video really clarified how it works over what books tell you

@mr_nice. 2 года назад

Finaly, a video about air brakes that can be understood by everyone!

@footalee2 2 года назад

I just subscribed to your channel 👍🇯🇲

@kwunmeichan8013 2 года назад

0:45, 2:58, 5:06

@powerbeast5691 2 года назад

I think it was pretty neat that you seem to talk like the dolphin in Family Guy (Billy Finn)! :)

@sweetpadre 2 года назад

Why is the screw at the bottom of the valve? Does it change the amount of air flowing through it?

@blackericdenice 7 лет назад

I've been driving trucks for 15 years. I had a feeling there were relays used but i didn't know how they work. Now i know. I just uploaded a video show how air brakes work.

@EducationalMechanics 7 лет назад

Thanks. That's a great video you have too.

@blackericdenice 7 лет назад

Thanks.

@JazzyJasTruckingzz 7 лет назад

blackericdenice do you know why some air brakes squeak when releasing the pedal ?

@dieselj7433 6 лет назад

Would like to get into it, tips ?

@tulw2728 5 лет назад

Finally, I got it. Thanks to your video Happy Thanksgiving day

@EducationalMechanics 5 лет назад

Well Done Private One.🙂

@schimu90 Год назад

Ok but, how does the brake pedal valve works? How can you choose the force of the brake?

@eugeneaksyutin534 3 дня назад

Great video, thank you!

@zues2013 3 года назад

Short concise and informative. Thank you

@navytechskull1932 4 года назад

What does the Bendix BX800142 Parking Valve do and how is it wired?

@alphatruckersinc.9417 4 года назад

Very well explained. Thank you.

@lelins300 4 года назад

First and best advice will be stay away and keep distance from trucks, tractor trailers.

@manchesterunitedfansintern9524 Год назад

Thanks for the information, very well presented😀😀😀😀😀😀

@waynepalmer5368 3 года назад

Great video but where does the exhaust hose(yellow) from the parking brakes goes to?

@mekanikobisdak4490 3 года назад

Thanks for sharing this video sir

@EducationalMechanics 3 года назад

Thank you for watching. It means a lot to us.

@ovidiofs1 7 лет назад

If I put another axle with brakes , I have to take the same signal from the pedal and putting one tank of air obiusly, great video .....

@shogunvanrepi3555 2 года назад

is the air relay valve another name for the four way protecting valve on the air dryer?

@EducationalMechanics 2 года назад

Hi. No, the relay valve isn't the same. The four way protecting valve A.K.A. the multi circuit protection valve does a different job of isolating individual braking circuits in a system so if one fails, the others don't lose all their pressure, prevent a total failure of the brakes. Hope that helps.

@harrisokP Год назад

Explains the bobtail proportioning valve

@kristoffertorres809 5 лет назад

Does it really make a sound when you step on the brakes like releasing air

@EducationalMechanics 5 лет назад

Hey Kristoffer, for the foot brake (service brake) the air is released when you take your foot off the pedal. For the secondary brakes (park brake) the air is released when you apply the brake.