Exploring Power Brakes: A Comprehensive Guide to Vacuum Assist Brakes

Introduction

Hello everyone and welcome to this week's video today I'm going to be explaining power brakes also referred to as a vacuum assist brakes. So what we've got going on here it may look a little complicated but I'll go through the system and hopefully in the end it will all make sense so here on the right we've got our brake pedal this is what you'll actually be pushing your foot on and the ultimate goal that we want to achieve is to move this piston in and increase the fluid pressure of this brake fluid which will go out to all your brake pads uh and then you'll break your car slow down your car.

The Vacuum Assist Chamber

So what we've got going on in the inside of this vacuum assist chamber is we've got two Chambers one on the left side which will pretty much always have a vacuum and then this chamber on the right side which can either have a vacuum or atmospheric pressure. Now we've got a link so there's this plate in the center that has a hole in it so that the vacuum can reach this other chamber. What happens is this plate here can move up and down with these hinges or left and right rather and as you push in this brake pedal what's going to happen is you've got these seals here now these seals are preventing the atmospheric air which is in this from getting inside of this chamber so once you press on the brake pedal it's going to push in and this seal right here is going to be opened up and that atmospheric air is going to be allowed to enter into here simultaneously.

Seal Operation

This seal here is going to close off so there's no longer a hole between this the chamber with a vacuum and the Chamber without the vacuum so as that's sealed and the atmospheric pressure comes in it's going to push very hard on this plate because you've got a vacuum on one side high pressure on the other it'll force it this direction and that'll make it much easier for you when you push on the gas pedal so you don't have to push in as hard. So as that Force pushes in it pushes this cylinder which pushes on the brake fluid which distributes out to your brakes and you slow down your car.

The Importance of Seals

So the real important thing here basically is just these two seals so this black part here can move forward and this green part here is going to seal off this hole and that happens simultaneously. So as you open up you seal off this and then the atmospheric air rushes in to fill the vacuum because that vacuum has been created um from your intake manifold. Your intake manifold is going to have a vacuum in it because your engine cylinders are pulling in air well they're also going to be pulling in air from this vacuum chamber and when you're not on the brakes that vacuum chamber is connected to here so it's going to have a vacuum in this whole area.

Benefits of Vacuum Assist Brakes

That's why if you ever uh turn off your car and you push in the brakes and you're still moving it'll work once because it'll fill up this chamber with the uh that had the vacuum in it. But if you try to break again and you're still moving with the car off you're not going to have that vacuum filled because the engine isn't running so then you're going to have to push a lot harder and just use the leverage point that you have to force in that brake fluid so it's going to be a lot more difficult which is a great benefit of vacuum assist brakes.

The Vacuum Assist Chamber in Action

So this big black chamber you see here is the uh vacuum assist for the power brakes uh here we've got our brake fluid and so as you can see it's got a tube running from the vacuum assist if we follow that to the intake manifold. So as the engine is running and pulling in air into the cylinders there's going to be a vacuum in here and that vacuum will also pass along into this chamber to be used to assist in braking.

Conclusion

In conclusion, power brakes with vacuum assist are an essential component of modern vehicles. By understanding how they work and the importance of seals, you can appreciate the intricacies of these systems and ensure your safety on the road. Remember to always follow proper maintenance procedures and address any issues promptly to avoid accidents or injuries.

"WEBVTTKind: captionsLanguage: enhello everyone and welcome to this week's video today I'm going to be explaining power brakes also referred to as a vacuum assist brakes so what we've got going on here it may look a little complicated but I'll go through the system and hopefully in the end it will all make sense so here on the right we've got our brake pedal this is what you'll actually be pushing your foot on and the ultimate goal that we want to achieve is to move this piston in and increase the fluid pressure of this brake fluid which will go out to all your brake pads uh and then you'll break your car slow down your car so what we've got going on in the inside of this vacuum assist chamber is we've got two Chambers one on the left side which will pretty much always have a vacuum and then this chamber on the right side which can either have a vacuum or atmospheric pressure now we've got a link so there's this plate in the center that has a hole in it so that the vacuum can reach this other chamber now what happens is is this plate here can move up and down with these hinges or left and right rather and as you push in this brake pedal what's going to happen is you've got these seals here now these seals are preventing the atmospheric air which is in this from getting inside of this chamber so once you press on the brake pedal it's going to push in and this seal right here is going to be opened up and that atmospheric air is going to be allowed to enter into here simultaneously this seal here is going to close off so there's no longer a hole between this the chamber with a vacuum and the Chamber without the vacuum so as that's sealed and the atmospheric pressure comes in it's going to push very hard on this plate because you've got a vacuum on one side high pressure on the other it'll force it this direction and that'll make it much easier for you when you push on the gas pedal so you don't have to push in as hard so as that Force pushes in it pushes this cylinder which pushes on the brake fluid which distributes out to your brakes and you slow down your car so the real important thing here basically is just these two seals so this black part here can move forward and this green part here is going to seal off this hole and that happens simultaneously so as you open up you seal off this and then the atmospheric air rushes in to fill the vacuum because that vacuum has been created um from your intake manifold so your intake manifold is going to have a vacuum in it because your engine cylinders are pulling in air well they're also going to be pulling in air from this vacuum chamber and when you're not on the brakes that vacuum chamber is connected to here so it's going to have a vacuum in this whole area that's why if you ever uh turn off your car and you push in the brakes and you're still moving it'll work once because it'll fill up this chamber with the uh that had the vacuum in it but if you try to break again and you're still moving with the car off you're not going to have that vacuum filled because the engine isn't running so then you're going to have to push a lot harder and just use the leverage point that you have to force in that brake fluid so it's going to be a lot more difficult which is a great benefit of vacuum assist so this big black chamber you see here is the uh vacuum assist for the power brakes uh here we've got our brake fluid and so as you can see it's got a tube running from the vacuum assist if we follow that to the intake manifold so as the engine is running and pulling in air into the cylinders there's going to be a vacuum in here and that vacuum will also pass along into this chamber to be used to assist in brakinghello everyone and welcome to this week's video today I'm going to be explaining power brakes also referred to as a vacuum assist brakes so what we've got going on here it may look a little complicated but I'll go through the system and hopefully in the end it will all make sense so here on the right we've got our brake pedal this is what you'll actually be pushing your foot on and the ultimate goal that we want to achieve is to move this piston in and increase the fluid pressure of this brake fluid which will go out to all your brake pads uh and then you'll break your car slow down your car so what we've got going on in the inside of this vacuum assist chamber is we've got two Chambers one on the left side which will pretty much always have a vacuum and then this chamber on the right side which can either have a vacuum or atmospheric pressure now we've got a link so there's this plate in the center that has a hole in it so that the vacuum can reach this other chamber now what happens is is this plate here can move up and down with these hinges or left and right rather and as you push in this brake pedal what's going to happen is you've got these seals here now these seals are preventing the atmospheric air which is in this from getting inside of this chamber so once you press on the brake pedal it's going to push in and this seal right here is going to be opened up and that atmospheric air is going to be allowed to enter into here simultaneously this seal here is going to close off so there's no longer a hole between this the chamber with a vacuum and the Chamber without the vacuum so as that's sealed and the atmospheric pressure comes in it's going to push very hard on this plate because you've got a vacuum on one side high pressure on the other it'll force it this direction and that'll make it much easier for you when you push on the gas pedal so you don't have to push in as hard so as that Force pushes in it pushes this cylinder which pushes on the brake fluid which distributes out to your brakes and you slow down your car so the real important thing here basically is just these two seals so this black part here can move forward and this green part here is going to seal off this hole and that happens simultaneously so as you open up you seal off this and then the atmospheric air rushes in to fill the vacuum because that vacuum has been created um from your intake manifold so your intake manifold is going to have a vacuum in it because your engine cylinders are pulling in air well they're also going to be pulling in air from this vacuum chamber and when you're not on the brakes that vacuum chamber is connected to here so it's going to have a vacuum in this whole area that's why if you ever uh turn off your car and you push in the brakes and you're still moving it'll work once because it'll fill up this chamber with the uh that had the vacuum in it but if you try to break again and you're still moving with the car off you're not going to have that vacuum filled because the engine isn't running so then you're going to have to push a lot harder and just use the leverage point that you have to force in that brake fluid so it's going to be a lot more difficult which is a great benefit of vacuum assist so this big black chamber you see here is the uh vacuum assist for the power brakes uh here we've got our brake fluid and so as you can see it's got a tube running from the vacuum assist if we follow that to the intake manifold so as the engine is running and pulling in air into the cylinders there's going to be a vacuum in here and that vacuum will also pass along into this chamber to be used to assist in braking\n"