 Hey guys, today I'm going to show you how to bleed a brake, but first things first When should you bleed a brake? Actually, it's pretty simple to check it out First thing you'll notice is that the brake will start losing some pressure For example on this bike a few weeks ago you could feel a lot of pressure on the brake around here And now I can only feel a lot of pressure around here So it's definitely a sign that the hydraulic system is losing some pressure and you definitely should bleed the brakes again But then why does this happen? Actually, it's pretty simple The hydraulic system isn't full proof So sometimes you get some air, some water in or simply because it starts leaking some oil and some air starts getting in And that can happen for several reasons simply because riding if the vibration of the bike and where you're riding Causes a lot of vibration and can get some air in or some water if you ride on some riverbeds for example Simply by cleaning the bike as well with the water pressure you can have some water getting in the oil system So you will mess in with you the water. It won't work the same way. Yeah, this poor guy is about to get knocked down Or sometimes just because the brakes feel like it and it will get some air or water in For this oil change you'll need a plastic syringe with a plastic tube, a Phillips screwdriver An 8 millimeter wrench, a reservoir or somewhere to put used oil and some dot for brake fluid oil Why use a plastic syringe? Well, it's pretty simple. A while ago I didn't use this system But I was completely sold after the first time I use it because Why do you simply pour the oil on the reservoir? The oil will be Over the air that will be on the hydraulic system So what happens is that you'll spend a lot of time pumping the brake lever in order for the air to go over the oil With the plastic syringe what you can do is push the air right from the bottom of the hydraulic system So it will push all the air out at once and in the air will come out from the brake reservoir So you'll pretty much eliminate the step of pumping The brake lever until the air comes out simply because you start from the bottom and not from the top and trust me That saves you a lot of time We first start by removing the reservoir's cap And if you don't change Regularly these bolts can be pleated hard to remove so be careful because Being in aluminium they are really easy to damage and if you check it out this oil is clearly bad because it's completely dark if you see it and It should be yellow kind of so it's definitely a sign as well that you should change Now we remove this small protection that usually comes with every brake and you insert The 8mm wrench in this case Usually it's always this size and with the plastic too you make sure it's well Tight So now what you're gonna do is Unscrew this bolt and let the oil Get in this range as you can see there's a lot of small bubbles so that means that There was clearly too much air on the brake system be careful not to spill this oil because Dot for brake fluid is a bit corrosive so Be careful where you let it drip So break Or you can Because this is bad Once there's no more fluid coming out check on the oil reservoir How is it if it's dry? There's anything left and if there is clean it Use some old rags or some paper to clean it well to remove all the old brake fluid and fill this range with oil and now simply insert the tube the brake again let it loose and You pump it back in and you'll see that on the reservoir up top You'll see it start filling in because you're pushing well oil from the bottom to regain pressure what you have to do is keep pumping the brake lever and Loosen the brake calipers bolt what will happen is that you'll break some oil will come out and what you have to do is While you are breaking you have to close the The brake caliper is not this step is actually the most important because it's the step that Allows you to build up some pressure on the hydraulic system This step is something that you have to do according to your field So it's something that you might have to do three four even five times until you build up enough Hydraulic pressure and that's it. That's easy as that Now you don't think you need to do to finish it up You need to fill the rest of the reservoir with oil close the cap and make sure you don't have any air in it And it's all done. Hope you liked it and subscribe