 Hey everyone today Want to put a new master cylinder? Well, it's used But we're going to change the master cylinder on this 1990 Corvette C4 convertible and Well, I don't know if I'm going to bleed the brakes today But I think what I'm going to do is open the bleeders up and see if it'll gravity bleed If not, I've got a tool that I want to try out that'll be in another video But we're just going to change the master cylinder today. I'll show you how we're going to do that. It's really simple. Stick around Okay, guys, so like I said, it's real simple. You've got two bolts back here. You've got one on each side one here One here and you've got your two lines for your front and rear There's one here and one here and you have your brake light It's not for your tail light brake lights. This is to let you know if you're low on fluid or whatever Your dash light the brake light in your dash will come on. So we're going to pull this off That can stay there because the lines aren't coming off. We're just going to break them loose from here. So let me get a couple wrenches and This one looks like it has a ground wire on it for some reason, but just make sure you put everything back Oh where it goes. This is for holding wires Okay, so Let's get let me get a couple wrenches Well probably just one wrench These might be different sizes. It looks like these are different size. So you can't mix them up. That's that's good I'll get a socket wrench for this couple line wrenches Let's get after it. Okay. So the first thing you want to do is Crack your lines loose first that way this is not wobbling around on you The back one Want to use nine sixteenths on I'm kind of limited on my line wrenches, I've got several but a lot of them's duplicates so Probably as with anybody not a lot of people have line wrenches unless you do the stuff all the time Which I do but I need more line wrenches. This is a 12 now ball means you can use a Regular wrench on these you have to be real careful what I've done before Is actually made my own line wrench see that's just a box-in wrench really with that cut out That has worked for me before too and that one's slipping around So Let me see if I can find something else that's gonna fit a little better than that. I'm gonna try my open end 12 Okay, it worked Awesome Now, let me go get something Because I know this is gonna start leaking It already has So let me get something Lay down here to catch that stuff just to try to you know stop some of that brake fluid from going all over the place now These are 12. I'm just gonna use a wrench on them Then take this off Take my wire holder I've got a wire with a plug a small wire. It's hanging down there. It was really close to the headers I'm gonna take this one off if you're not gonna unhook the battery just be careful over here so your wrench don't hit the Hit your positive cable So we've got this one Take that little ground cable off Yours may not have it. I don't even know if that's original. I can't I never had to do anything with mine Up here, so I don't even know if it had a ground cable up here but you know these are These bodies are Fiberglass, so you know, there's a lot of grounds on these cars Any ground or anywhere you take off make sure you put it back on and take these off These lines are weird because Like the 12 was really loose on it Well, not really loose. It was loose, but 7 16th would not go on and a half inch was well way too loose. So it's kind of kind of like an in-between really strange On these lines now We're gonna take this off And we're gonna set it up beside See how much fluids coming out of this one none's coming out of that one. That was our issue We're gonna set these up side by side make sure we got the right part. Okay, so as you can see Here's the old one. Well The malfunction one here's the new one, which is actually It's used You can tell that See that tells you rear R and F or rear in front They both have that they both have this this doesn't matter in what orientation it is You know, it doesn't matter if it's turn this way or turn like that one is I'll be mindful if you buy these new It doesn't come with these reservoirs or caps. So try not to break yours if you take it apart So, yeah, it looks looks pretty good Yeah, that's I would say that's the issue. We were having right there because nothing's coming out of that hole so this There's a problem with one of the cops up in here it had brakes that had back brakes, but you know PBR Paps blue ribbon Paps blue ribbon actually not but you get the idea So it's the same master cylinder awesome. So let's take this one over here and let's put it on and these caps If you do have to take them off They hook in right here and right there and I see a little dry cracking there I'll have to keep an eye on it Make sure it doesn't start leaking But if it does you just You put a little screwdriver right down in there Pry this out a little bit and these will pop up off. They're harder to get on than they are to take off Okay, now see right in here That's a leak so There's seals in here And that's a piston and there's a seal. Let's see It looks like this one's all the way back the other one's not But I don't see any leak here Maybe there no I don't see it leaking so probably probably leaked at one time So all right, let me get you on the stand and we'll get this one put on but see that one's Not clear all the way back You should bench bleed these you put them in a vise filled up with fluid and your run lines from here and Back into there or you can put plugs on there and pump it till you don't see any more bubbles But you can also do it on the car, which is what I'm gonna do. All right, so I'm not sure Why this it's not popping clear out so Could just be stuck from sentin I want to see if I can get that out of there Yeah, that should come all the way back huh Well, let's put it on here and we'll get some kind of pressure going And maybe That'll pop back Here's a little a slight adjustment here All right, so now I'm just gonna reverse the process and put these on I'm gonna tighten them down. I'll put some fluid in it a lot of times If you fill them up with fluid and you get good fluid coming out of here They're not as hard to bench bleed which are not really hard anyway but So what I'm gonna do is I'm probably just gonna bleed these things this thing Through the bleeders all right. Well, let me get some fluid. I forgot to bring my fluid out Okay, then I got a little rag in here. I'm just gonna make sure there's no dirt in here. Okay, this is that bleeder tool I bought I never used one like this before but Put your hose on here Okay, now I had to change my end it comes with one, but it's for China size air hose I guess so You put your hose onto this end You put your hose up here and this goes down to your bleeder Make sure your bleeder is loose of course Make sure you're loosing your bleeder make sure they're free because these ones weren't free I actually had to drill some dirt and rust out of them and they had caps on them But this just goes over top of your bleeder. So we're gonna put that on there. All right. Make sure it's on there real good Let's put this on here and what we're gonna do I don't know how well this camera's gonna pick it up But see that because I've already done the other side now normally when you bleed breaks I just wanted to try this out show it to you and get familiar with it You want to always start when you're bleeding breaks start at your farthest wheel Which usually you know in the left-hand drive vehicle it be your right rear your passenger rear and then You go to over to the driver's rear then the passenger front and the driver's front normally So if you can see that That in there now We're just going to turn this valve on and wait And you'll see the stuff coming down out of here and wait until we don't see any more Misses in there when it looks like it's a full a full line then we're pretty much bled Supposedly I've never used one of these before. All right, so let's go ahead Sucking the fluid out See we're not done yet see it's still coming up through there See how it looks like it's missing We're going to keep going until it all until it comes out Until we see it coming out all one steady color Keeping on your master cylinder to make sure it doesn't go empty That's pretty much it I'm going to keep going I'm going to keep going till it doesn't till it doesn't look like that anymore I'll show you what it looks like once it's done. Now this tube that's going down in here If you watch that you'll see a little bubble every now and then if you're seeing bubbles Keep going and keep filling up your master cylinder reservoir when you're done You can take this cap off and drain it into something and keep it or dispose of it if it's still good. This is not too bad But it is a little dark So I'm just putting all new in but if you started out with new lines You're going you should have new fluid and you can just unscrew this and put it let it drain right back in your master cylinder So let's see how we're doing When I don't see any more bubbles I'll take my bleeder back up And it should be blood in theory. I Don't know how well these work. I've never tried one. I just see it. It was cheap. So I bought it okay, guys, so I Gotta wait till tomorrow, but now you know how to change the master cylinder That was the main thing and you know how to bleed them With that tool, but this one's the one we took off. This one's ours See that piston right there look at that one That one stuck Looks like almost halfway down. I couldn't get it done stick I thought maybe if I put it on and got pressure in it It would start working because sometimes I'll do that but But it wouldn't so there's mine There's the one they sent me so Yeah, that's I have an issue with that So now I gotta get a hold of them Give them a little piece of my mind why they're trying to sell me something that's in more shape than mine This one you can't get breaks at all You get because you can't even bench bleed it, you know This one at least I had back brakes. I could move around Not worried about going through the garage door but yeah, so And also if you look down here at the bottom Right there So it looks a little wet. I don't know if you can see that so it looks a little wet. That was actually leaking this one wasn't It had one of them had leaked at one time because I could see it on the booster This one wasn't leaking there, but this one was so that wasn't even gonna be any good anymore They just cleaned it up. So me a piece of junk for 60 bucks. So Ordered one from the parts store 176 bucks So It'll be in in the morning So anyway, I Wanted to get the tires done tomorrow, but I Wanted to get brakes on here first, you know, my dad always taught me if you're building a car or something You know, you got to stop it before you start it. So that's what I'm gonna do at least we got the tires I can take them down any time All right guys. So there you go. Shea bearer myth man legend gone for now. We'll see you guys in the next one I'll give you an update on this When I get the brakes fixed and What they told me about That old master cylinder over there You know, I don't have a problem with buying new parts, you know, you know, you try to save money I mean, this is just an old 1990 c4 granted. It's a convertible. It's got a bunch of extras on it But this ain't never gonna be a $4,000 car or whatever I do to it You know to make this a $4,000 car. I would have to put a good $5,000 in it Doesn't make sense. I'm just wanting something that we can just cruise down to the river to the lake in and you know over to a car show here and there and So, you know, it's it's it's hard to put that kind of money in an old car like this You know, if this was a stingray or something, that's not a problem, but it's not you know, so All right guys. Thanks for watching appreciate it. We'll see you in the next one Hopefully your everyone's weekend went well We'll see you guys soon. Bye. Bye. Take care