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How an ABS Motor Works
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- Опубликовано: 28 май 2015
- A brief teardown and look inside an ABS pump.
The Anti-lock Braking system in your car prevents your wheels from locking up during braking. Preventing a skid is key to maintaining steering control and stability during a maneuver.
Wheel speed sensors feed an ABS computer to monitor if your wheels are skidding during braking. When the brake pedal is depressed, brake fluid flows through the master cylinder to the ABS pump and out to the wheels.
If the ABS computer detects the car is skidding, it activates a relay in the ABS motor, temporarily releasing brake pressure up to 15 times per second, preventing a skid.
Opening up the ABS unit reveals a heavy duty DC motor that is responsible for building brake pressure and 12 solenoids, three for each wheel.
ABS wheel speed sensors are a magnetic sensor that function similar to a hall effect sensor. It responds to changes in the magnetic field from the splines in the driveshaft or hub, which generate a voltage that the computer can read.
The ABS system also functions as part of the vehicle stability control, brake assist, pre-collision braking, traction control and active cruise control among other safety features in modern cars.
If you've got an ABS light, you'll need an advanced OBDII reader to diagnose the issue. Amazon sells them here:
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amzn.to/2S3u6U9 (Canada)
The ABS Sensors shown in the video can be replaced with these sensors:
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amzn.to/2XpjODz (Canada)
Purchase tools used in this video to dissect your own car parts:
Angle Grinder (aka snap ring pliers):
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amzn.to/3hyoQFR (Canada)
3/8" Ratchet set:
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Screwdriver set:
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this is by far the best explanatory video on ABS on youtube
+Burak Soner Thank you
could not agree with you more.. spot on .. really the best explanation.
i agree
And it got watched by 109 people right after being dumped by the boyfriends.
@Burak Soner The Best brother. the guy explained it like you can use it for any school.
I'm taking a $5000 automotive course with one of the best schools and your video explained everything MUCH better than anything I've learned.
+worldtrades Ironic, heh. Straight and to the point is my style. You'd probably want more detail to understand the background if you were in school though.
Welcome to RUclips University😅
This is the best 3 minutes and 17 seconds I've ever spent on RUclips. Technical and informative with no nonsense or stupid music. Great work, thank you!
is it still true?
Wow, I didn't think it was possible to explain this much about ABS internals in just over 3 minutes. Extremely well done!
Thanks, short and to the point is how its gotta be
Finally a video showing how ABS works instead of showing what it does!!!! This video moves pretty fast (thank goodness for pause and rewind) but it's so awesome! Exactly what I was was looking for! Thanks so much for this informative, straight to the good parts, video!!
+Daniel Dickey Thank you for the feedback. Yes a bit fast paced so you don't fall asleep.
Maybe 4 years ago they didnt put computers in ABS modules like they did in 2011 on the Ford Fusions..............................................................................
This guy is on one of the best explainers on RUclips.
Well thanks
wow, great video, well edited and filmed and straight to the point. Wish more videos on youtube were this well made. Cheers.
+Star Star Thank you
There are, but RUclips rewards/favors longer videos, especially those over ten minutes.
Agreed
My lexus hybrid had an accident & the automechanic guy said they'd have to change/repair the ABS, so I got curious to know more and voilà your 3mins Masterclass enlightened me beyond measure.
Thank you for this masterfully & straight-to-the-point ABS-for-dummies video.
Cheers sir 👍
Good video. ABS typically has 8 valves. This unit has 12 so it includes stability control functions but there are still only 2 valves per wheel. The other 4 valves are needed for directing fluid flow within the hydraulic assembly and isolating the master cylinder. ESC can pump the fluid in either direction while abs only pumps fluid back to the master cylinder.
Good to know
3 minutes of pure, condensed knowledge. Phenomenal video.
Thanks!
Nice video. No wasting time screwing around while we have to sit and watch every screw being taken out, no camera jostling, no out of focus, you explain everything without mumbling, sniffling, "aah-ahh-uhmm", no gay music...shit, you should do a video on how to do RUclips videos!
100% correct.It didn't have the 5 minute intro of boring bs either!
+Matty Bt thanks
+Andork Kuomo Thanks that is my style!
Damn......I have tried to understand ABS system for many years, and this guy just made me understand it 100% in under 3 minutes....you are the best sir!
incredible, you explained an entire system in 3 minutes and made my understanding of it jump by 300%.
I LOVED how you did this video!! Very informative!! Clear picture and explanation of how the ABS system works!!
Thanks, glad you enjoyed it.
Finally a clear explanation of the ABS, THANK YOU !!
You are welcome. I have another more complex and system video coming soon
I swear you are the best teacher that exists regarding auto mechanics. I will surely give you 20 bucks if i have an easy way to do it
The ABS has 3 valves per wheel to Isolate, Dump or Pressurize each wheel circuit as the ABS module sees fit. The ABS pump runs every time the module requests it and it is used to pressurize any circuit the ABS wishes to.
Great video
Yup
Thanks
so what your saying is the owners of cars with abs.. have three wishes?
short and straight to the point. A very nice video.
If you've got an ABS light, you'll need an advanced OBDII reader to diagnose the issue. Amazon sells them here:
amzn.to/2xyYax6 (US)
amzn.to/2S3u6U9 (Canada)
The ABS Sensors shown in the video can be replaced with these sensors:
amzn.to/2LyBKod (US)
amzn.to/2XpjODz (Canada)
Purchase tools used in this video to dissect your own car parts:
Angle Grinder (aka snap ring pliers):
amzn.to/3nyCsVp (US)
amzn.to/3hyoQFR (Canada)
3/8" Ratchet set:
amzn.to/3hA7LLD (US)
amzn.to/3zgHE2d (Canada)
Screwdriver set:
amzn.to/3tGeU1S (US)
amzn.to/3hy4Z9G (Canada)
Auto manufacturers typically refer to the entire ABS assembly as the "ABS module". And unlike the module you used in the video its more common that the "ABS computer" is integrated into the ABS module as a one piece assembly. The word "motor" typically refers only to the DC motor itself. Calling the entire ABS module a "motor" is confusing because that is not the commonly used terminology that people are used to.
Thanks for the clarification
@@speedkar99 I do a lot of technical writing. To be effective you have to use the correct and most commonly used terminology so that people don't get confused. Remember that you know what you are talking about but your audience doesn't. As such getting them to understand what you are trying to tell them is your responsibility.
@@speedkar99 Which toyota did you remove the ABS motor from...year and model, I need to do an experiment and it looks like this module /motor might be suitable.
@@unionse7en @speedkar99 I actually had this same question haha - looks like a ES300, on ClubLexus he says it's from a V6 Solara.
That was the best most succinct and accurate video in the universe. This is what a RUclips video should strive to be. I was looking for information, I got the information without all the bumbling around. Thank You.
These 3 minutes & 17 seconds was really worth it
Glad it helped!
I like the way each wheel has three solenoids, it's very loving.
Sure is
Your videos are more educational than going to school. No homework and to the point.
This channel is really underrated. Thanks for explaining on abs n cruise control best ones.
Hi Fella' I have been watching other technicians stripping ABS pumps, you are the only one to me that has done a great commentary and visual explanation of the operating system. so her goes my attempt at fault finding on the ABS pump and control module. Thanx. Tom in Ayr Scotland.
Thanks, I'm glad you find my videos easy to follow
I have 40 years in Aviation working on abs systems to far more wheels and amazed how auto adopts so much from this. I want to say your video was the most detailed learning experience to show someone with no idea how it works to at least understand this complex system. I hate that they make them with such crappy parts (miniaturized relays that can't take the abuse they need) solenoids that using lower power and much smaller currents can fail case in point Corvette braking system in abs. cost for new one $1400 bucks for a 6 dollar relay known for going bad. I miss analog in its rawest form of durability. We live in a digital world and analog has to be shrunk to make it work with less current. My point is Bravo to you for doing such a great video and the explanation was spot on.
Thanks I'm glad that video helped
this is perhaps the best presentation so far . I have had a jammed ABS Valve on my 2008 Citroen C5 ABS module . soaking a towel wrapped around the aluminium valve body of the ABS module with boiling hot water and rapidly tapping the aluminium block with a small 2 oz hammer has freed off whichever ABS valve which was stuck in the operated position .I now have brakes and a pedal which no longer sinks to the floor . opening the caliper bleed screw is super important when installing new brake pads . Contaminated brake fluid passing through the ABS valves will almost certainly cause the valves to lock. There will be no ABS fault showing . My Foxwell NT630-Plus ABS scan tool was indicating there was a valve which was not operational .. an audible CLICK should be heard when each solenoid is activated . I have a second hand ABS module coming from EBAY and I intend to fabricate a manifold to test the individual valve operations .
Thanks for the feedback
there is no such thing as master cylinder input and return. there are two separate brake systems in case of brake failure, master cylinder has two chambers built in.
+Marijus Marcinkus I agree, thanks. The fluid flows back into the reservoir when the pedal is released. The power steering system on the other hand, has a supply and return.
@@speedkar99 so the abs pump just controls the valves ? does not pump break fluid ?- so if the pump goes out would you still have breaks?
@@mars188 No. It controls valves and a motor. If a wheel is just about to slip (or already did), then the pipe towards the wheel is shut off. (It is a default-open valve.) If desired effect is not achieved, then the valve to the motor is opened. The motor forces brake fluid back to master cylinder, reducing brake power on that wheel. When stabilized, this default-off v. is closed.
Short, sweet, very informative. Very well made!
Clear, concise, and no fluff. Well made, good job, and thank you.
+3 Drinks In that's my style
This is a very useful video in terms of showing what is inside an ABS modulator and what to expect if you take various parts off. It's not great in terms of explaining how ABS works.
Thanks for the feedback
The most organized and accurate explanation, thumps up .
Excellent diagram! Perfect disassembly! Quick. Clean and simple! Thank you for doing this video. I loved it!
Brief but complete. Great explanations covering exactly what we should learn, thank you.
+Sergio Valente that KS I'm glad you learned something!
Thanks for a clear and concise explanation of ABS system.
Awesome. I'll have an updated ABS video by the end of this year.
I was highly educated in a short period of time. Quality content, no BS!
That's my style!
@皇帝死亡（Death Emperor）
I wish I could make a turbo or supercharger video but I don't have access to one.
maybe your negihbor will let you you play on his truck
you can get one from a junk yard if you have one near you
Thank you, now I know how to test each solenoid valve.
You are welcome!
Hey man... I just want to say thank you... your video I simple and yet very informative... even someone like me that is not very mechanically/car minded can understand what is going on... I wish all RUclips videos were like yours...
+Evo K I'm glad you appreciate my video style. Thanks
Excellent. Makes me think I could easily bypass the ABS system by simply tying the lines from the front and back of the master cylinder to the front and back brake lines.
Great video you covered all the spects and show how much is worth and the need to work your brakes
Thanks I'm glad you appreciate my work
Thanks a lot bro I was searching for a detailed video like this. Very helpful I'm really into ABS brake I just love it. I really search in depth about how ABS system evolved
Glad you learned something
Sweet video! Great explanation and teardown. Right to the point without all the yippity-yap. No click bait here!
Thanks. Short and to the point is my style!
Great video...succinct narration with clear and concise explanation of each component. Excellent!
This is a really easy to understand video on how this works, thanks for the video!
Glad you liked it!
Excellent, Excellent video. Clear and right to the point! Thanks for taking the time to make it!
+itaintmebabe99 Short and to the point is my style! Check out my series of reverse engineered car videos for more.
Thanks Bro your a genius
you made it is to understand something that seemed so complex.
That’s a lot of information in not a lot of time. Well done!
Thank you !
Nice video. Quick and to the point with nice diagrams, explanations and diagrams. Much appreciated
+martyfriedman666 thanks, short and to the point is my style, check out my other videos
You can imagine how much your teaching me,,,I have excellent retention and memory. Thanks
I'm glad you learn from my videos! That's what I made this channel for - sharing knowledge
@@speedkar99 I can do pretty much anything, because my mind is always open and not to proud to learn ..
@@speedkar99 so many making vedios that don't really know, and trying to sell a product, like the lockup kits...
An actual person explaining it, well done!
I am sick of AI videos, they way they speak hurts my brain.
Thanks for making these! 😀👍
Excellent! So much info in such a short video. I wish more people would make videos this way..
Thanks, short and to the point is how it has to be.
A brief, great explanation! Thank you so much for this video!
You are welcome
Actually, the motor only makes pressure in ESP operation, since no pressure is applied on the brake pedal. The main purpose of that motor is to flow the excess brake fluid from normal ABS operation (when ABS kicks in, some of the fluid is released inside a chamber and has to be resent to the brake fluid reservoir when the pedal is released)
+Morbid Dawn yes, exactly
Thanks thats exactly what I was wondering about!
Its dosent need the motor for returning the fluid.. this dosen't make any sense.. for that you could just run a line to the fluid tank.. if the abs kicks in.. the valves release some pressure.. if you are downhill and keep the foot of on the brake pedal.. the pressure realising will eventually make the pedal end on the floor. The motor is there to rebuild the pressure when the wheels regain grip and the ABS stops.
The motor runs even if your foot is on the brake pedal. The ABS module may add more pressure after it isolates the wheel that is slipping.
you sir are a good teacher ,thats why I subscribed and thank you.
+Rashid Rehman Thanks
Check out my other videos for more
Thanks man , you've solved this puzzle for me as I was thinking and trying to get my head around it , your explanations are right on target and very simple to grasp ,
RUclips should've shown me your channel long time ago since I watch videos like this pretty much all the time ,
although this is the first video of yours which I just watched , I can confidently say that you know what you are talking about 👍 .
+Nahid Bepari thanks. I do my research before shooting videos so I can explain things easier. I'm glad you appreciate my work! Thanks
That speed sensor system is a magnet that has the tone ring passing by it. This induces AC voltage that the computer reads. Faster the tone ring moves past the sensor, the higher the voltage. Simple troubleshooting is to put a voltmeter set to read AC voltage on the pins in the connector. Jack up the wheel and spin it. This should show a voltage.
Yes but it's not AC voltage, it's a pulsed DC signal
Good vid and straight to the point. This is how all vids should be.
Thanks, that's my style!
Excellent video boss, clear, well edited( and short!). Well done
jojotogo10 Thanks
Thanks very well put together video ,amazing to see how it all works .
How the single motor controls 12 solinoides/valves? Randomly? Or whats is the purpose of motor in that system?
The motor pressurizes the fluid
@@speedkar99 okay Thanks!
As the video states when a wheel starts to lock up the pressure to that wheel is released. The wheel rolling onto ice or snow commonly causes this. Then if the wheel rolls onto dry pavement again and regains traction you want the braking action on that wheel to increase again. This requires that more pressure be applied to that wheel. Since the driver may be holding his foot steadily on the pedal the DC motor is required to supply the extra pressure necessary to reactivate the brake after traction on that wheel is regained.
man, you are awesome in teaching. i really appreciate your videos its so informative in a way there would be no confusion understanding it.
good job sir !
I rate this 10/10. Its nice to find this video before going to sleep, I have an exam in two hours D:
Where were you all these years? The video is 3 mins but full of information.
Hi
I've been here all these years
Where have you been? 🤣
The master cylinder supply lines are front and rear chambers. There is no "Return Line" as this video said.
+Twisted thanks for the correction
Great information . I see online that several places rebuild these units . Some use a module in addition to the pump and motor . These are expensive as new . I can see why a rebuilt unit can save money . As long as the quality is there .
Your explaination is very good as I can understand.
At about 2:25 you mention a "big chunk of machined aluminum that's not really serviceable." But... we see the large black end caps with maybe a screwdriver slot in them. I'm guessing this is where the reservoir/accumulators are. If I'm correct, this is where the ABS blows of pressure with each pulse. It may be a nitrogen bladder inside a chamber, and excess liquid pushes into the chamber and compresses the bubble. Is this correct, and if so, how big is the chamber and bladder?
Great video man, absolutely outstanding! Just one thing - when you show the splines on the CV shaft, I believe the arrow is actually pointing to the tone ring. The splines should be just where your right palm is.
Thanks
Thank you. It's very useful for me.
Very good video
Great to know how ABS pump actually works. However, are ABS pumps repairable? When these pumps fail, what are the component that usually fails and can we fix it instead of replacing the whole unit?
Thanks you for showing the actual ABS hardware ✌🏽
Your welcome
earned a subscription after seeing one video! not eeven because i was asked, because this guy is top notch for content!
Thanks!
Great video.Would you offer an opinion as to why so many of these units fail, particularly in European cars?Is it the solder joints in the control board?
+Matty Bt solder and solenoids burn out
Solenoid coils since they have very small wires probably get fried on some abs modules depending on the quality of construction. Spark coil packs have the same problem, small thin wire wrapped a bunch but then high volt zaps so they fail more often than abs probably. And ya solder joints may break or were soldered bad from the factory. And finally the coils on the electric abs motor may fail.
Great video!! Thanks a ton mate. Straight to the point, and explained exactly HOW does it work, rather than WHAT it does like in the other videos on youtube!!
Perfect concise description
now how hard is it to put one of these systems on some hydraulic sim racing pedals and control them via software. Hook up game telemetry abs signals to it and make the brake shake. Seems as easy as power the motor and hit the valve with the abs signal.
They already use this in modern cars with automatic braking
Finally someone who actually explains this well.....
+Crazystuffyousee thanks
Not much on this out there eh
Excellent explanation!
+theoriginaltoadnz thanks
Good video , and good explanation... faster, understandly. Thanks master.
You are welcome
Great job! And done in under 4 minutes!
Awesome thanks
Best video.. Pls make a video on heating of brake fuild while braking.. Also a video on how much water the brake fluid absorbs...
Thanks, excellent presentation.
This video is so good, showing the ABS motor is really a scarce thing on youtube....the downside is that the explanations could have been slower and a little bit elaborate....
Quick and complete explanation!
+Axeltreman thanks.
oh woww that was awesome thank you for showing us the inside, in which you never get to see all that much =]
***** Your welcome :)
you are really good, i love watching your video's, you always explain everything even to the last detail. i might even learn something ;)
Thanks
your'e welcome you are a great teacher =]
Thanks
I have a 1998 Lexus LS400 and it contains abs system. When using the brakes strongly, the car is moving from the back to the left, as if I am sliding the car. What is the defect? The tires have not solved the problem, and the speed plate does not have any errors in the brakes, traction system or abs
Clear and concise video, thanks for sharing your knowledge with the ABS system
You are welcome
I already had an idea of how it works but this is great
Hi there what does the electric motor pump actually do and does it run all the time?? from Fred in UK.
+Tom Smith It creates the pressure in the brake lines for the ABS and traction control. The solenoids then decide which wheel to give more or reduce pressure from. It only runs when the ABS or trac is activated.
+speedkar99 Ok Thankyou....
@@speedkar99 Hi, studying my car i find out that it also has a pre-charge pump as a part of traction control system. So what actually it does if ABS module can push and release brakes itself? I thought abs is for releasing, and pre-charge pump is for engageing brakes.
Awesome video; concise, informative and comprehensive.
+ya472 that's my style. Thanks !
Excellent vid clear and to the point thanks
+hunting fishing that's my style!!
ABS needs only 2 valves per wheel, this unit that you have has also ESP, which has additional 2 valves for each braking channel allowing it to have controlled pressure on each separate wheel :)
+barabasiosif agreed
What a great job you did explaining this! Thanks very much.
+FilterYT thanks
Wonderful explanation!!! Quick Question: Can the 12 coil solenoids be cleaned like with electric cleaner and or a pipe brush/toothbrush?... as my control unit does not work.
I sprayed some on my plug connector but not the solenoids. Or could I use something different to clean if necessary.
Thanks!
Great explanation little bro
+donx03 thanks big bro
Thank u very much to give clear cut information in shortly n hope expect more vedios like dis .once again thank u
Your welcome
Clear concise explanation. Thank you
Welcome
Very informative video. Would be nice if someone open the aluminum housing or just explain how the fluid is routed on each brake line? This would help a lot of people diagnosing issues with their regular braking due to ABS module.