Vacuum brake booster - How it works! (Animation)

Today, the vacuum brake booster is a component of many motor vehicles. It usually consists of the same components.
Content
1) Housing, vacuum connection, brake pedal
2) Rolling diaphragm and diaphragm plate
3) Dust boot
4) Control housing with springs and air filter
5) Vacuum chamber and pressure chamber
6) Partial brake position and full brake position

[@TheJere213]

These seem to be quite similar to air brakes which I was taught when I was becoming a army driver(many trucks use air brakes). Excellent animation and very informative video. Keep up the good work!

[@tigerseye73]

Excellent animation, making this important automotive devise easier to understand. Thank you.

[@hacker2ish]

So much better than the other videos related to the same thing

[@MVW54]

Important to mention… When the piston is in the rest position, the brake fluid will be balanced via The compensation hole. This compensation hole is very small, clean this compensation hole with a very thin wire of copper, if it would clog… you are guaranteed a dragging caliper, this has already happened to me twice!!! with the Honda CBX 1000. Stay Safe.

[@motoant7055]

Whenever I learn about stuff like this I'm just amazed. Incredible ideas and engineering

[@austinchandler3079]

I know right, it's pretty incredible.

[@samuelbehrendt6291]

I literally just had my brake booster vac line disconnect in my 2000 Saab 9-5 Aero not 30 min ago.. I lost all power brakes and my engine soared to idle at almost 3k rpm. It's amazing how a little 6mm hose could mean life or death.. if that popped out during de-cel on an off ramp, could have easily killed me or someone else on the road or both.. luckily it happened in a low speed residential zone late at night.. and that's why I believe in God.. also one time I had a 1995 Saturn SL2 like 9 years ago. I saw a turtle on the road so I slammed on the brakes.. I slowed down just enough to not kill the cute little turtle before a brake line blew..

[@alikhidzam3749]

Yeah man , how do people even come up with these

[@riverrat9412]

Perfectly explained! Thank you!!

[@yarinsheiman7789]

Thank you for this perfect explanation, helped me lot.

[@NobleNobbler]

Love your animations!

[@gamypalacios375]

wow! had a lot of trouble trying to understand this solely off words from my textbook. Great animation and explanantion! if possible , can you do animations over hydraulic brake valves?( proportioning ,pressure sensitive proportioning, load sensitive, metering, combination etc. valves)

[@TheNostorian]

Thanks. Have to switch mine out but know how it works makes it a bit easier to understand the what and why.

[@fadil60kill]

thank you for your video..

[@Mikhail-Orekhov]

Hello, Thomas! Yours animations are great!!! Please, can you do the animation about diesel injector pump and common rail system? Thank You for your videos!!!

[@akoj3262]

Thank you for sharing. Very beneficial.

[@willhorin3065]

You are a legend!!

[@ThomasSchwenke-knowledge]

You make me one :)

[@BrianAndersonTT]

Wow.. I did not expect that.... so the booster uses atmospheric pressure while the master cylinder uses hydraulic fluid.

[@harleyd9857]

I can’t get the link between the brake pedal and the brake booster to move When installing. Do I need to crank the engine to add vacuum in order to let the linkage move?

[@JoeDoe1]

Thank you.

[@louisianarebeltv4878]

1:18 looks like a giant valve core 😂

[@SiteReader]

What failure in the brake booster can cause the brake pedal to not return fully after application of brakes?

[@christopherjholland]

How does the braking stop? I guess the springs returns the diaphragm back. So the vacuum is only assisting the brakes, force is still exerted by legs. Good thing if brake assist failed.

[@moexus]

this is the beauty of mechanical engineering fluid mechanics course.

[@MiguelGarcia-nl3ci]

How are you doing? I'm also studying for engineering

[@thisisale]

Thank you!!

[@kirankumarappanthula513]

Thank you sir

[@mccollesther3458]

can I ask a question never mentioned when vacuum boost brakes explained. When press brake pedal separating the 2 compartments and opening valve to atmospheric pressure surely the air will rush in and cause severe maximal braking - which clearly does not happen in practice. So what moderates the system. Is it the fact that when the diaphragm moves forward it takes the rest of the unit with it and thus pulls it away from the rod you are pushing on and this shuts off the air inflow - unless you push further down to maintain pressure and thus allow continuing air inflow. I think this must be a critical component to the brake function and wonder why never mentioned!

[@westmus]

Yes it's impossible to find any good descriptions on how boosters work, a lot of important information are always missing. The control valves works in relation to the pedals pressure changes. That's how the pressure generated by the booster can be varied, instead of being on/off. The ratio between booster output pressure and the pedal pressure are based on the internal valves. Max available booster pressure are based on the membran size and if it's an single or dual membran booster.

[@ndinapoleonnapoleon6582]

So is the use of the air that goes out of the vacuum

[@2mrRB]

How is there a vacuum behind the diaphragm before you push the brake pedal? I mean, there is atmospheric pressure when you push the brake, so at some point this pressure needs to be reduced to stop braking?

[@SKautovlogs]

Normally when the brake is not applied there is a vacuum acted both direction of diaphragm unit. Otherwise brake will function without pressing the pedal. when pressing pedal atmospheric pressure pushes the rod and thus effort of driver get reduced.

[@saix81]

I wish you did another one for hybrid far braking systems.

[@iplayloud2]

And then what... that diaphragm pushes oil into the brake lines?

[@muhammedrasheedsuper1038]

Thanks

[@SamVieiraGuitar]

Now, knowing this animation, is it possible for the brake booster to be the culprit of a low brake pedal?

[@rajeshr5140]

yes

[@steveakendo8579]

Which car is that

[@jakearnold7814]

Does anyone know how a vacuum is created within the brake servo ??

[@tsd560ti6]

What do you mean by "brake servo" ? The vacuum on the right side of the diaphragm is created by the engine itself (naturally aspirated engines suck in air themselves, therefore they created a couple of psi "sub-atmospheric pressure"/vacuum [German: Unterdruck]. I hope thats what you have been asking for :)

[@KHaLeD-jv7fu]

@@tsd560ti6 A brake servo is just another name for brake booster search it up.

[@SKautovlogs]

for gasoline engine , manifold vacuum used, but in the case of diesel engine there is a separate vacuum pump .

[@saraareshk936]

what is animation software?

[@ThomasSchwenke-knowledge]

I used Carrara 8.5 Pro for this animation.

[@zteaxon7787]

So basically it uses hydraulic principles and the different areas to apply braking pressure using air besides the other hydraulics of the brake fluid. I find this explanation rather strange but thanks anyways.

[@GMoney-B]

Same here, I'm kinda confused to be, at least mostly by the script/dialogue.

[@memess1406]

Excellent animasion I am learning English rate me in the like goes

[@steveakendo8579]

where is the plunger

[@jameshunt1822]

"vaccum is present" "vaccum is supplied by the engine" Technological language is more accurate when we don't try to be semantically correct

[@vinayakbagodi5979]

How does atmospere pressure goes out again. Creating vacuume in pressure chamber

[@southfloridatechnicaltrain2589]

There is a rubber disc that seals the vacuum chamber from the pressure chamber when the pedal is depressed. When the pedal is released another seal is formed blocking atmospheric pressure from entering the chamber and the vacuum chamber is re connected to the pressure chamber.

[@zteaxon7787]

So basically it uses hydraulic principles and the different areas to apply braking pressure using air besides the other hydraulics of the brake fluid. I find this explanation rather strange but thanks anyways.

[@southfloridatechnicaltrain2589]

AIR the only air is atmospheric pressure. Its the lack of air that apply the power for brakes. When the pressure chamber fills with atmospheric pressure.

[@2mrRB]

@@southfloridatechnicaltrain2589 Thanks! it's a shame that this is not showed on this video

[@SKautovlogs]

@@southfloridatechnicaltrain2589 sir, but in this video it is not mention about there is a vacuum acted both side of diaphragm when the brake pedal is not pressed and otherwise brake will function without pressing the pedal. thank u sir

[@jesusdominguezdomingez7969]

::::55 go control housing.

[@Grumpy_Old_Van_Man]

Shouldn't the red arrows really be on the other side of the diaphram to demonstrate pulling due to vacumn?

[@ThomasSchwenke-knowledge]

Watch again! :)

[@erikgonzalez6236]

So, this would cause my motor to uncontrollably Rev...?....

[@flowrob6861]

If ur booster diaphragm leaks - yes.

[@azmanazmanglgbase9243]

Beratttt

[@roshankujur1842]

Hindi me

[@donaldumunawa4787]

Wut

[@mrinalnath7550]

Vacuum brake invented by gurprasad das

[@rishimalik3738]

Change ur thumbnail NOW!!

[@qwerty-gc8tn]

And after you are done braking how does the atmosphairic pressure from the diaphram stops pressuring the disk?