Drum Brake System
Drum Brake System

Drum brakes are usually used as rear brakes in automobiles Let’s go through the parts involved in the system and see how it works in detail Brake Drum – Acts as the braking surface on the wheel side Wheel Hub – The part to which the drum and the wheel are attached to Let’s have a closer look with the wheel hub off Back Plate – This holds all the brake components together Brake Shoes – These will be pushed against the inner surface of the drum The friction between the lining and the drum is what makes the wheels to slow down Hold Down Spring – Holds the brake shoes towards the back plate Retaining Springs – Returns the brake shoes to its resting position Wheel Cylinder – The hydraulic part which pushes the brake shoes Modern drum brake systems are self adjusting Which means when the lining wears out, the system adjusts the brake shoes towards the drum For that, the system uses a Brake Adjuster Adjuster Lever Adjuster Spring The wheel cylinder receives the force that we applied on the brake pedal At the back of the wheel cylinder there is an inlet port to receive the fluid and the bleeder valve to remove air in the system Let’s have a look at the exploded view Cylinder Body Dust Boots Pistons Piston Cups Piston Cup Expanders Return Spring When force is applied on brake, hydraulic fluid pushes the wheel cylinder pistons which pushes the brake shoes This action creates friction between the brake liner and the inner surface of the drum and brings the automobile to rest The adjuster makes sure that the brake liners remain close to the drum as the liners wear down As you can see, it uses a screw mechanism to increase its length between the shoes Each time the car breaks while in reverse, the cog is pulled down by the pin to push the shoes against the drum And that’s how a drum brake system works Stay tuned for more presentations from Auto Tech Labs

90 thoughts on “Drum Brake System”

  1. tsunderesoul says:

    It's been quite a while!

  2. FL TT says:

    Amazing explaind! 🔧🔧🔧🔧

  3. Nimesh Desai says:

    thanks for this I'm an student of Automobile engineer .😊😊😊

  4. Onur Erol says:

    what is the advantage of this than disc breaks?

  5. Labrador McGraw says:

    As usual, great graphic visuals completely ruined by piss-poor English and the worst robot voice we've ever heard. Shame.

  6. Tabby Black says:


  7. master J# says:

    plz upload video on vacuum pump working

  8. Lee Kumara Nsm says:

    Thank you sir next vedio I am waiting sir

  9. Nick Quan says:

    Please make more videos about automobiles, i like your videos very much!!

  10. Mohd Noman says:

    thanx for the video please keep uploading

  11. Music Never Dies says:

    More videos, please !!!!!

  12. Glenn Smith says:

    Do all adjusters adjust when in reverse?

  13. Labrador McGraw says:

    Jesus Wept! You really need to change your robot voice! It's the worst I've ever heard.

  14. P S says:

    Pls upload more videos related to mechanical engineering 🙂
    U r doing a excellent job 😉

  15. Krishna K says:

    Useful this video keep it up and upload more Auto tech videos best of luck

  16. RQieb Hooolahan says:

    TQ. That's was good explanation.

  17. TheZippoMike says:

    Please do one about gear, manual. Also automatic, but personally I'm interested in a manual one. Thumbs up! Nice work! Advice, use your voice.

  18. Keshav Bhatt says:

    Sir please make more such videos it really teaches a lot to us

  19. yumenowinds says:

    Drum Brakes can self adjust the gap between drum and pad?

  20. Karthik Khar says:

    Hello sir, I am from India. I have a question about drum break failure. Why drum break worn out unevenly. It is big problem in our work shop. Please reply sir. I expect your reply. Bye sir

  21. Gregory Bryant says:

    Oh come on. Couldn't you find a human to narrate?

  22. Shubham Bisht says:

    Thanks for sharing these awesome videos with us make more videos love it…..

  23. Curtis Greenwood says:

    I have learnt alot more about automobiles please make more and upload more 👍

  24. USA America says:

    More videos

  25. James Ramputi says:

    Hold down springs lol

  26. Ace 2 says:

    Next video must be of 'Working of a Transmission' plz

  27. PRITAM TEMBARE says:

    you guys are doing a great job. Your 3d presentations are awesome and best from any other videos, please upload frequently.
    these videos helped me alot

  28. Prasad Bavdekar says:

    Please make a video on types of rear axle(semi floating,full floating,three quarter floating)plz plz i really need to know!!!

  29. arnar sedrakyan says:

    Pls make more

  30. carbon273 says:

    I would love more of these. If possible,may you touch on aeronautical parts!😍

  31. Sanath Sana says:

    Please make more videos about auto

  32. jonnes dumayan says:

    the animated is so nice =)

  33. Thetrucky69 says:

    Excellent information.

  34. Zach V.D.90 says:

    is this a dual-servo or non-servo?

  35. raj jokes says:

    Make a vedio on how a steering wheel works

  36. Ayub Shaik says:

    please make more videos about auto mobile so that increase subscribers

  37. Robert Vanocker says:


  38. Ana Nogueira says:

    Awesome videos, you should do more!

  39. qi gao says:

    very good! Please continue!

  40. Otta vada says:

    Sir Im from INDIA I finished B.E. Mechanical engineering with 80% plss provide me JOB

  41. bala murali says:

    Mechanic full engine prepare video send

  42. Pawan Kularia says:

    Sir i want to know that how i make such type of animation videos?????

  43. Shyam Chouhan Chouhan says:

    Sir please upload video break type and work

  44. salman khan says:

    Is too good and so easy to learn how to work

  45. Harissh Chand says:

    Please upload more videos like this

  46. Osho says:


  47. Osho says:

    The starter video helped alot! Thx

  48. gopi krishna says:

    Please explain about steering system and transmission system.

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  51. Javier Moji says:

    Make more videos!

  52. muthukumar j says:

    Super explanation video. Please make more engine critical videos

  53. RS criationz says:

    Plz make video abut fip

  54. RS 1990 says:

    Certain vehicles like taxis, police cars and limousines don't have self-adjusting brake shoes.

  55. Kirthi Kirthi says:

    Sir please put some more videos here related to automobile workings.. I really love the explanation as well as the detailed animation. Looking forward to watch more videos here….

  56. mahesh viswakarma says:

    Hello thank you for your complete explanation.please make a video on fuel system diesel engine and petrol engine

  57. ganesh bonula says:

    Please do some more videoes
    For me

  58. Miles Lange says:

    I see the brake drum as a percussion instrument.

  59. Vijay K says:

    Why you stopped doing such this amazing work…will you please continue this knowledge sharing process? Its my humble request sir

  60. Nedko Kostadinov says:

    Drum Brakes Suck

  61. Dhanesh kumar V says:

    More videos plz

  62. vipin a c says:

    Can you share your videos for vlogging in my channel in other language

  63. Vasa #22 says:

    Please make more videos 🙂

  64. Soumya Mapa says:

    Also describe about motorcycle engine work…

  65. BRAG BOY says:

    Dear Auto Tec… Plz make a video on Lowrider car jump principle….how the car get jumps🤔🤔

  66. Sindhuraj Ghaisas says:

    excellent videos make more videos i wnat to learn

  67. Luke Samual says:

    Need more video clips…

  68. Ta T says:

    Why this channel stopped making videos? Best explanations ive seen on YouTube

  69. dex says:

    please make more videos

  70. Ryan Scherbluk says:

    Did he just say drum brakes only work in reverse

  71. Mohammad Owayza says:

    The self adjuster works only when braking on reverse ?

  72. Nayem Bapary says:


  73. Kybo says:

    More Videos please. Driveshaft. Supercharger. Gearbox. etc.

  74. Jeff Stone says:

    Great explanation and video! Problem with other youtubers is they want to spend 10 minutes telling me how to make Orange juice and these techs do braking systems in and 2 1/2 minutes! Thank you

  75. chinthu ram says:

    pleage show the power steering in 3d animation

  76. chinthu ram says:

    i don't understanding power steering can you apload about that videos

  77. Yusuf Yusuf says:

    We want another car videos.

  78. Malindu Pabasara says:

    Good explanation please continue ur lessons

  79. manobala g says:

    Mass explanation, its very very useful to us , can u plz make working of timing chain video,its my humble request…plzzz thalaiva….

  80. Mansoor Khan says:

    same voice as in racer tv….

  81. eight minutes says:

    Self adjustment is done only while backing up?

  82. Ford Ford says:

    I'm very expressive this video
    I want about head timing information

  83. Raveen Kumuditha Rathnayaka says:

    So good. Plz upload more videos

  84. Danhxnter says:

    Can you make more videos, I’m an apprentice and this helps me a lot

  85. Stan Tudorel says:

    There is no one who explain and make such videos like this.And his videos are gold , we need moore like this .
    We apreciate them as well !!

  86. prateet dosi12 says:

    Add differential gear working, construction

  87. TheAngryGamerTAG says:

    Hella should post more like ignition systems for coil on plug, coil pack, and rotor style distribution systems maybe carburetor and throttle body injection or fuel injection systems

  88. Virat 1718 says:

    why stop uploading videos…please upload more videos

  89. gue st says:

    23 dec 2019 8:46 am est:thanks

  90. Mohammed Umar says:

    Make more videos ..thanks for all of them

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