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!
Very clear and understanding video. First year Apprentice trying to understand all the fundamentals in the heavy diesel mechanic world and videos like this help alot. Thanks
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
Awesome video! Now I feel like I completely understand air brake relays, and this is extra helpful because I now know I have a faulty relay on my school bus. Cheers mate!
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!
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
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!
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.
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.
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.
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?
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.
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
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 :)
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 ?
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.
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.
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.
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.
This is the clearest explanation and visualization of air brake systems that I've ever encountered. Thank you!
You're very welcome, thanks for watching.
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!
Yes! Very good video!! Thanks
Very clear and understanding video.
First year Apprentice trying to understand all the fundamentals in the heavy diesel mechanic world and videos like this help alot.
Thanks
Me too 😅
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
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
Thanks Kevin 😀
I'm about to start the journey of studying every one of your videos.
Finaly, a video about air brakes that can be understood by everyone!
Thank you for this great video. You must have spent a lot of your valuable time making it.
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!
I love Eddie Izzard!
Very good explanation-you made it very simple and easy to understand
Im soooo happy that ive found you! You could not beleve how much easier my studies are now! Thanks again!
Great video really clarified how it works over what books tell you
What's even more marvellous is the durability of these parts.
Short concise and informative. Thank you
Thanks for taking the time to put this together. Great explanation, graphics are a big help.
Thanks BirdDog, glad it helps.
This is EXACTLY the information I was looking for. Thank you!
Thanks a lot for the good teaching, I love this, very easy to understand
Awesome video! Now I feel like I completely understand air brake relays, and this is extra helpful because I now know I have a faulty relay on my school bus. Cheers mate!
You're sooo good at explaining, keep it up
thanks 😄
Great video!!!!The simple graphics make the principles much easier to understand.....thank you very much!
Thanks Mark. It means a lot to us.
Now what is difference between relay valve and quick release valve.
Very well explained, can be understood by everyone
This satisfies my curiosity of that air below vehicle blown on the road. Exhaust... Air released from delivery pipe line.
Thank you.
Excellent video. Relay just acts like a diaphram control valve.
Excellent work. Keep it up.
Thanks Abid Mahmood. 😀
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!
Fantastic explanation and illustration. Great video!
Thanks. 😉
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.
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
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. :-)
Thanks for a thorough explanation
That was easily understood, thank you.
I passed my test yesterday but yet here I am still doing refreshers 😂
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!
Fantastic Video. Thank you so much
Thanks for explaining the functioning of RV in a simple way...
You're welcome. We're glad it helped.😀
Great video but where does the exhaust hose(yellow) from the parking brakes goes to?
Superb explanation. Someday (if you like) would love to see a similar video for DD3 (bus, non-spring brake) brake systems. Thanks.
Good 👍
Very well explained. Thank you.
Outstanding explanation. Graphics are awesome. Thank you for posting
Very nicely explained & the sound you make in between daa daaa makes me laugh. Keep it up. Thanks for the video.
Namaste
Brilliant video, cannot thank you enough!
I was just working on one of those relays last week. Really threw me for a loop I think now I can fix it
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.
This guy is legit! Very educational and it made me laugh!🤣🤣😂😂👍🤘
Thanks Willie B. 😘
@@EducationalMechanics ١
Thanks for the information, very well presented😀😀😀😀😀😀
2:29 made my day
wow , you explained it in so nice way , i can do better tomorrow in my exam, thankyou
Thanks Shubham Mishra, good luck tomorrow.
Thank you sir , i've watched lots of your videos that would be very helpful , thanx a lot
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 .....
How is signal pressure controlled? Yes, you use press the pedal, but then how the system knows how much signal pressure apply?
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.
Great video. Just subscribed!
Great video, very informative.
For a small valve, there's a lot going on there. I'll have to look at this video a few times to take it all in. Thanks
om a truck mechanic so am loving this video
Well done!
Fantastic video we need more
ON THE TEST QUESTIONS, DOES 2000 FLATBED TRUCK REQUIRED THIRD OR TOP BRAKE LAMP ASSEMBLY
is the air relay valve another name for the four way protecting valve on the air dryer?
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.
excellent video
Thanks for sharing this video sir
Thank you for watching. It means a lot to us.
Does it really make a sound when you step on the brakes like releasing air
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.
I have a 2017 Frieghtliner Cascadia and the Air Dryer is located right in front of the passenger tire off the chasis, very easy to get at !!!
Who cares
Is there any valve available that is adjustable to give a higher service brake pressure
Why is the screw at the bottom of the valve? Does it change the amount of air flowing through it?
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?
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.
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
Great explanation. Well done. I have one common question. What is use of solenoid valve in addition with relay valve and how its functioning?
Finally, I got it.
Thanks to your video
Happy Thanksgiving day
Well Done Private One.🙂
good one, easy to understand the systems
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 :)
Good 👍
NICE e explanation, THANKS😃😃
Explains the bobtail proportioning valve
Good stuff. Just like been a DAF training school but without felt tipped pens and no nodding off lol
Still got my red, yellow and blue felt tips! 😉
VERY WELL DONE VIDEO !!!!!!!!!
Thanks Robert
What's the valve called that keeps air in the bags when you drop the trailer?
Ok but, how does the brake pedal valve works? How can you choose the force of the brake?
this video is useful! thanks!
What does the Bendix BX800142 Parking Valve do and how is it wired?
Awesome information thank you
Excellent. Greetings from Venezuela.
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 ?
Are the relays well labeled
ON THE EXAM TEST QUESTIONS, WHAT IS THE MAXIMUM AIR PRESSURE LEAK ALLOW , 3,5,10,OR 15 PSI.
Thank you, this video is very helpful for brake system analysis
Thank you for the simplification.
Good video and clear to understand mate
Thanks Muchie
Very very good
How to set up the lines on the exhaust ports on the 2002 Mack granite concrete truck with the em7 300 engine
What can cause the power spring not to release
Great video.. Thank you
Very good learning video
Thank You Sir, Great Observed Good Idea Video Channel I love this post to learn more about
Great video
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.
Thanks. That's a great video you have too.
Thanks.
blackericdenice do you know why some air brakes squeak when releasing the pedal ?
Would like to get into it, tips ?
Great job
Thanks for Teaching And God Bless
I just subscribed to your channel 👍🇯🇲
Great video! Can you tell me why do some air brakes squeak when you release the brake pedal? Like the ford ones for example
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.
Air brake sys troubles shooting ke bare main vedio banao kyaa problem ati hai jaam ka
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.
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.
Which type of compressor r used
You are brilliant
Best among available...