Why we need to bleed brakes and a cool tool that helps.

Hi everyone. I wanted to do a quick tutorial on hydraulic brakes. I've talked about air brakes in the past, but I wanted to talk about hydraulic brakes. And this is for beginners. All my professionals out there will already know most of this, but the reason why you have to bleed hydraulic brakes is because air is compressible and fluid isn't. So if you think about it, when fluid is coming in here and going into this caliper and pressing against these brake pads, forcing the piston to push the brake pads against the rotor to stop the vehicle, when you push on a fluid, the whole fluid, it moves because it can't be compressed. So when that fluid pushes on that piston, it moves immediately. But if there was a big air pocket in here, that air would compress and then you wouldn't have the immediate action of applying the brakes that we have with pure fluid. So when we do things like replace major components or have a leak that we've fixed or anything that would introduce air into these lines, we have to bleed them. That's what this guy up here at the top is, is it's a bleeder screw. So they make tools where you can put the tool on the master cylinder and bleed it. You have the method where you have someone step on the brake pedal and bleed it. So let's talk about the brake pedal method. You're going to have somebody like in the cab of the truck step on the brake a few times and then hold it down. Once they hold it down, you will break this loose and brake fluid would start coming out. And then once everything stopped coming out before they can let up on that brake pedal, you have to tighten it because if they let up before you tighten it, it's just going to suck air back into the system. So they would let off the brake pedal after you tighten it. And then you might have them do it again until you get the right feel on your brake pedal. That's where something like this comes in super handy. So this is a check valve where if you're working in your driveway by yourself and you don't have somebody else to help you with the brake pedal thing and you don't have one of the more expensive, fancy master cylinder pressurizing machines, then having this guy right here is very useful because one end of this hose is going to fit on the end of this bleeder screw. And this is going to allow the fluid and air that you push out to leave the chamber or the caliper. Sorry, I'm thinking air when you let off the pedal, that check valve is going to prevent any air from being sucked back in. So you're going to be able to make sure that the master cylinder is full, put this tool on here, and you're going to be able to go in the cab and do the brakes yourself and not worry about every time you lift off the brakes of introducing air. About the only reason you might have to stop before you get the right pedal feel is if you're worried about the master cylinder fluid level getting too low. You might have to top it off a little bit and do it some more before you get to that point. But this is definitely a tool I would recommend for anybody that does DIY projects in their garage at home by themselves or if you just want one in your toolbox at work just in case the people are too busy to help you out. This is definitely worth it. It's not that expensive and it makes the job a lot easier. So that's my tool trick of the day for you guys and just a brief explanation of why we have to do this in the first place. Thank you guys for watching. Please give me a like and a follow and I'll see you in the next video.