How an ABS Motor Works

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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The ABS Sensors shown in the video can be replaced with these sensors:
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Purchase tools used in this video to dissect your own car parts:
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[@toddw9021]

Wow, I didn't think it was possible to explain this much about ABS internals in just over 3 minutes. Extremely well done!

[@speedkar99]

Thanks, short and to the point is how its gotta be

[@buraksoner9408]

this is by far the best explanatory video on ABS on youtube

[@speedkar99]

+Burak Soner Thank you

[@chins2009]

could not agree with you more.. spot on .. really the best explanation.

[@bencrosbie]

i agree

[@aam77]

And it got watched by 109 people right after being dumped by the boyfriends.

[@sanakiyamam1987]

@Burak Soner The Best brother. the guy explained it like you can use it for any school.

[@worldtrades]

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.

[@speedkar99]

+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.

[@getmorecontent.]

Welcome to KZbin University😅

[@strattelepbass]

This is the best 3 minutes and 17 seconds I've ever spent on KZbin. Technical and informative with no nonsense or stupid music. Great work, thank you!

[@eepp]

is it still true?

[@smartcrow7630]

Excellent diagram! Perfect disassembly! Quick. Clean and simple! Thank you for doing this video. I loved it!

[@DanielADickey]

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!!

[@speedkar99]

+Daniel Dickey Thank you for the feedback. Yes a bit fast paced so you don't fall asleep.

[@Starlite123]

Maybe 4 years ago they didnt put computers in ABS modules like they did in 2011 on the Ford Fusions..............................................................................

[@562Baudelio]

incredible, you explained an entire system in 3 minutes and made my understanding of it jump by 300%.

[@lukapogo]

3 minutes of pure, condensed knowledge. Phenomenal video.

[@speedkar99]

Thanks!

[@starstar5657]

wow, great video, well edited and filmed and straight to the point. Wish more videos on youtube were this well made. Cheers.

[@speedkar99]

+Star Star Thank you

[@CarsSimplified]

There are, but KZbin rewards/favors longer videos, especially those over ten minutes.

[@JamesDownes]

Agreed

[@ashish45691]

This channel is really underrated. Thanks for explaining on abs n cruise control best ones.

[@jaykay8882]

I LOVED how you did this video!! Very informative!! Clear picture and explanation of how the ABS system works!!

[@speedkar99]

Thanks, glad you enjoyed it.

[@steveruss3654]

Great video...succinct narration with clear and concise explanation of each component. Excellent!

[@vince9262]

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.

[@speedkar99]

Good to know

[@flyurway]

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 KZbin videos!

[@mattybt400]

100% correct.It didn't have the 5 minute intro of boring bs either!

[@speedkar99]

+Matty Bt thanks

[@speedkar99]

+Andork Kuomo Thanks that is my style!

[@3drinksin273]

Clear, concise, and no fluff. Well made, good job, and thank you.

[@speedkar99]

+3 Drinks In that's my style

[@lelelela8198]

The most organized and accurate explanation, thumps up .

[@kingz_kenyan9160]

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!

[@matthewking5612]

I like the way each wheel has three solenoids, it's very loving.

[@speedkar99]

Sure is

[@SvcGlobal]

Brief but complete. Great explanations covering exactly what we should learn, thank you.

[@speedkar99]

+Sergio Valente that KS I'm glad you learned something!

[@richardwallinger1683]

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 .

[@speedkar99]

Thanks for the feedback

[@roycas3]

short and straight to the point. A very nice video.

[@randalesmith]

That was the best most succinct and accurate video in the universe. This is what a KZbin video should strive to be. I was looking for information, I got the information without all the bumbling around. Thank You.

[@Faluthe]

Thanks for a clear and concise explanation of ABS system.

[@speedkar99]

Awesome. I'll have an updated ABS video by the end of this year.

[@belchnasty]

This guy is on one of the best explainers on KZbin.

[@speedkar99]

Well thanks

[@sharabi21]

Finally a clear explanation of the ABS, THANK YOU !!

[@speedkar99]

You are welcome. I have another more complex and system video coming soon

[@rohanclassic]

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!!

[@fatroberto3012]

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.

[@speedkar99]

Thanks for the feedback

[@SiteReader]

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.

[@theblukatlife]

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

[@quadnuva8274]

Short, sweet, very informative. Very well made!

[@alexalexander5628]

Thanks Bro your a genius you made it is to understand something that seemed so complex.

[@tomayrscotland6890]

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.

[@speedkar99]

Thanks, I'm glad you find my videos easy to follow

[@tahirkamboh147]

These 3 minutes & 17 seconds was really worth it

[@speedkar99]

Glad it helped!

[@austingibson3315]

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

[@speedkar99]

Yup Thanks

[@larrygonz932]

so what your saying is the owners of cars with abs.. have three wishes?

[@sanrasuzumaki942]

This is a really easy to understand video on how this works, thanks for the video!

[@speedkar99]

Glad you liked it!

[@irishRocker1]

Nice video. Quick and to the point with nice diagrams, explanations and diagrams. Much appreciated

[@speedkar99]

+martyfriedman666 thanks, short and to the point is my style, check out my other videos

[@franciscoromero3011]

Your videos are more educational than going to school. No homework and to the point.

[@ItAintMeBabe99]

Excellent, Excellent video. Clear and right to the point! Thanks for taking the time to make it!

[@speedkar99]

+itaintmebabe99 Short and to the point is my style! Check out my series of reverse engineered car videos for more.

[@sekolahonlineteknikotomotif]

A brief, great explanation! Thank you so much for this video!

[@speedkar99]

You are welcome

[@tamia6397]

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 !

[@rhpham2]

Your explaination is very good as I can understand.

[@franian77]

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

[@speedkar99]

Glad you learned something

[@EvoKeremidarov]

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 KZbin videos were like yours...

[@speedkar99]

+Evo K I'm glad you appreciate my video style. Thanks

[@dave1455]

Thanks very well put together video ,amazing to see how it all works .

[@billsmith2212]

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 .

[@thomasperusi7854]

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.

[@speedkar99]

Thanks I'm glad that video helped

[@korn111685]

I was highly educated in a short period of time. Quality content, no BS!

[@speedkar99]

That's my style!

[@sterlingarcher4989]

Thank you, now I know how to test each solenoid valve.

[@speedkar99]

You are welcome!

[@ukin237]

Thanks you for showing the actual ABS hardware ✌🏽

[@speedkar99]

Your welcome

[@156nunez]

Great video you covered all the spects and show how much is worth and the need to work your brakes

[@speedkar99]

Thanks I'm glad you appreciate my work

[@carlitosway627]

excellent ! simple well explained and tutorial to actually explaining the design and mechanism. thank you.

[@JoeBob79569]

Excellent! So much info in such a short video. I wish more people would make videos this way..

[@speedkar99]

Thanks, short and to the point is how it has to be.

[@nahidbepari5459]

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 , KZbin 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 👍 .

[@speedkar99]

+Nahid Bepari thanks. I do my research before shooting videos so I can explain things easier. I'm glad you appreciate my work! Thanks

[@jojotogo10]

Excellent video boss, clear, well edited( and short!). Well done

[@speedkar99]

jojotogo10 Thanks

[@georgespangler1517]

You can imagine how much your teaching me,,,I have excellent retention and memory. Thanks

[@speedkar99]

I'm glad you learn from my videos! That's what I made this channel for - sharing knowledge

[@georgespangler1517]

@@speedkar99 I can do pretty much anything, because my mind is always open and not to proud to learn ..

[@georgespangler1517]

@@speedkar99 so many making vedios that don't really know, and trying to sell a product, like the lockup kits...

[@FilterYT]

What a great job you did explaining this! Thanks very much.

[@speedkar99]

+FilterYT thanks

[@MannYgfx]

Such a great explanation, just what I was looking for. Thanks for making this!!

[@speedkar99]

You are welcome! See my newerr video on how braking systems work for another teardown

[@machina_aeterna]

Fascinating. Thanks for explaining.

[@CharlieD954]

Clear and concise video, thanks for sharing your knowledge with the ABS system

[@speedkar99]

You are welcome

[@mytrehman]

you sir are a good teacher ,thats why I subscribed and thank you.

[@speedkar99]

+Rashid Rehman Thanks Check out my other videos for more

[@markmutti]

Extremely useful info. Great video, thank you!

[@speedkar99]

+Mark Mutti glad you enjoyed it thanks

[@steve17]

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.

[@speedkar99]

Thanks

[@moviestudioland]

fantastic lesson on ABS. Thank you!

[@speedkar99]

Your welcome

[@coryszeman8572]

Great video! I've been wondering for a long time now. And since I'm replacing all the brake lines today I had to see if there was a video and thanks to you there is.

[@speedkar99]

Awesome! I just pulled the ABS system out of the G35 project yesterday and will have a video on that soon!

[@SK4869]

oh woww that was awesome thank you for showing us the inside, in which you never get to see all that much =]

[@speedkar99]

***** Your welcome :)

[@SK4869]

you are really good, i love watching your video's, you always explain everything even to the last detail. i might even learn something ;)

[@speedkar99]

Thanks

[@SK4869]

your'e welcome you are a great teacher =]

[@speedkar99]

Thanks

[@TheGuruOfGadgets]

Sweet video! Great explanation and teardown. Right to the point without all the yippity-yap. No click bait here!

[@speedkar99]

Thanks. Short and to the point is my style!

[@jean-paulvanewijk1810]

That’s a lot of information in not a lot of time. Well done!

[@speedkar99]

Thank you !

[@jimkellberg]

Thanks, excellent presentation.

[@jean-michelgastonguay7990]

Nice job, I've learned something new today again! Thanks!!!!

[@speedkar99]

Glad you learned something

[@marcosmena8172]

Wow so easy to understand. Thank you Master.

[@Nhatnamshare]

Thank you. It's very useful for me.

[@juanete838]

I rate this 10/10. Its nice to find this video before going to sleep, I have an exam in two hours D:

[@Calvin-xe6kb]

AMAZING, quick and explained very well thats a tallent`right there

[@sprinterfix]

Perfect concise description

[@mrjeremy001]

Clear concise explanation. Thank you

[@speedkar99]

Welcome

[@13maxjax]

Nicely explained. Keep it up.

[@stevensims3342]

Of course, this unit's electric motor is entirely serviceable with screws fastening the housing on. Then you have manufacturers like BMW who TRY to make the motor housing on ABS assembly factory press-wedged together so you have to file parts of the aluminum valve body to free the housing then drill holes in the housing in order to access the tongue of the clips that hold the motor in the housing. Great informative video on ABS module assemblies!

[@AM_Mechanic]

well done, thanks for the simple explanation.

[@speedkar99]

+M Stewart thanks

[@stephenwgreen78]

That was a great video. Thank you

[@mec_gus]

Good video , and good explanation... faster, understandly. Thanks master.

[@speedkar99]

You are welcome

[@ya472]

Awesome video; concise, informative and comprehensive.

[@speedkar99]

+ya472 that's my style. Thanks !

[@paulyangicho9331]

Thank u very much to give clear cut information in shortly n hope expect more vedios like dis .once again thank u

[@speedkar99]

Your welcome

[@denos.2688]

I already had an idea of how it works but this is great

[@richmartinez2748]

Great vid! Keep putting these up!

[@cmaharaj1]

Very possibly one of the best explanations available. Thank you...

[@kjellgilje]

Thank you for your valueable information ! VERY helpful,

[@speedkar99]

You are very welcome!

[@richmiller9844]

Great job! And done in under 4 minutes!

[@speedkar99]

Awesome thanks

[@someone1089]

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.

[@Axeltreman]

Quick and complete explanation!

[@speedkar99]

+Axeltreman thanks.

[@robotmad]

Good vid and straight to the point. This is how all vids should be.

[@speedkar99]

Thanks, that's my style!

[@konatadesuka]

Excellent, right to the point.

[@technomage6736]

Fantastic quick explanation 👌

[@speedkar99]

Thanks

[@adriansong1872]

Excellent and highly informative

[@fcukmegently]

Great educational video. Well done & thank you.

[@afynuDn]

Mechanical thanks really to u Hope to forward in future

[@huntingfishing1704]

Excellent vid clear and to the point thanks

[@speedkar99]

+hunting fishing that's my style!!

[@0wen1066]

earned a subscription after seeing one video! not eeven because i was asked, because this guy is top notch for content!

[@speedkar99]

Thanks!

[@TheRouteShow]

Best video.. Pls make a video on heating of brake fuild while braking.. Also a video on how much water the brake fluid absorbs...

[@theoriginaltoadnz]

Excellent explanation!

[@speedkar99]

+theoriginaltoadnz thanks

[@undercover3004]

Some good explnations on ABS; thanks.

[@speedkar99]

You are welcome!!