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Brought to you by 1AAuto.com-- your source for quality replacement parts and the best service on the internet.
Hi, I'm Mike Green. I'm one of the owners of 1A Auto. I want to help you save time and money repairing and maintaining your vehicle. I'm going to use my 20 plus years' experience restoring and repairing cars and trucks like this to show you the correct way to install parts from 1AAuto.com. The right parts installed correctly, that's going to save you time and money. Thank you and enjoy the video.
In this video, we're going to show you how to remove and replace the front wheel bearing hub on this 2004 Trailblazer. This is the same for many 02' to 09' Trailblazer, Envoy, Bravada, Rainier, Saab 9-7X, as well as Isuzu Ascenders. Tools you'll need are various millimeter sockets, a breaker bar or pipe, if you need some extra leverage. I actually didn't need the extra leverage on this vehicle, but I do show you how to use it, flat blade screwdriver, wire brush, a large c-clamp to reset the pistons in the caliper, torque wrench, 35-millimeter socket, which is something that most toolboxes don't have, but you do need that 35-millimeter socket and then jack and jack stands.
Start by prying your cap off. That's a 19 millimeter and if you don't have air tools, you want to start with the wheel on the ground, loosen the lug nut, then raise it, port it with jack stands and then remove the wheel and the tire. I'll just fast forward taking off the rest of those lug nuts and then removing the wheel and tire.
Now either pull or using the steering wheel, turn your wheels, so you have easy access to the back of the brake calipers. Now, we're going to check the condition of the brakes. Now, I spin this, you'll the rotor move. Okay. Then right to the right there, there's actually your pad. As you can see, there's not that much life left and it's not looking well on the outside either. We're going to remove the caliper, which is removing a bolt up here and a bolt down here and then after that, we're going to remove the caliper bracket, which is two large bolts, 18 millimeter one here and one up here.
The bolts on the caliper, relatively easy, 13 millimeter, use a small wrench. We'll just speed it up here as I remove those two bolts. Okay, the caliper comes right off. You can put that over here. Okay. These are 18-millimeter bolts for the caliper bracket. You're going to want a breaker bar, which is a bar to give you extra leverage. Okay. As you can see, it actually come apart pretty easy. If you don't have a breaker bar like this, you just have a ratchet, you can put a piece of pipe on to give you extra leverage and pull it easy on the pipe and it should have come loose.
When you're all the way up, you can just take your pads off. Take your screwdriver, which should pretty easily pry out. All right. You can see this one. That little line down the middle is the wear and tear. It's actually just about at the end of its life.
We'll fast forward again as we remove those two 18-millimeter bolts that hold that caliper bracket. Okay, that comes off. Then your discs should just come off. If your discs don't come off, there are threaded holes and you need to use some bolts. What you do is you put the bolts in there and the bolts crack against the hub to push them out. Okay. These rotors are pretty crusty looking so I am going to replace them using a 35-millimeter socket. If you don't have an impact wrench, what you'll need to do is, you'll do this at the beginning, you pull that cap off your wheel and then with the big breaker bar and a pipe, you'll loosen this hub nut. Because I have an impact wrench, I can do it this way.
When you're replacing the hub, you don't want to go just hammering away on the axle because you can damage your CV joint, but most of the time, if you just give this one good whack, you'll see that it's broken loose. Basically, just watch the relationship of your axle to your hub when you give it a good hit. Okay and it moved just fine. Just a note, I've yet to have a GM car, where just hitting it with the hammer once didn't break it free.
Right in behind there are three bolts, one here, one up there and then there's one around the back side as well, right down there. Now I get to those bolts. I'm going to take an 18-millimeter socket with a short extension. Okay, put it right on there. I'm going to use the poor man's method. I've got my ratchet and keep the pipe for leverage. Okay. Now I'm going to pull nice and easy and actually these come apart pretty nicely.
Now I'm going to speed up as I loosen the other two and remove those three bolts. Okay, your lead comes out. Okay, follow it around and we'll clip back here, push with the screwdriver, push on the other side, and push that out. Okay, and pry these right out. Now I'm going to really speed through here. All I'm going to do is follow the ABS lead up and pry out the connectors. One note is to check your new hub because that will tell you kind of how the connectors come apart, whether or not you need to pry them out of the frame or just open them up, so that you can put the new lead in.
This last connector with a tab right beside here, go in, lift up, and pull that off here. Okay, turn to the side, that out, off. All three of my bolts are off and my harness is disconnected. Just take a hammer. Okay. It all pops off. You need to get this metal shield off. Okay, get the metal shield off by using a combination of tap it off with a hammer and there's your hub. Take a wire brush here. Just clean off some of the scale. Okay, put that back on and a new hub from 1A Auto, exact same thing as the old one. Take the harness and put it back in place, work it onto the CV, push it on, take one of the bolts, put it through here, move the back end plate and start it into the hub. Grab the other two bolts.
I'm just going to speed it up as I reconnect that harness and route all the clips. It's very important to clip it back into place as it was originally, keeps the ABS harness from rubbing against anything and possibly damaging your ABS brakes.
Now we're going to put the torque on these three bolts to 90-foot pounds. I'll fast forward a little bit as I torque the other two bolts and again, I said I torqued them to 90-foot pounds. We're going to put our hub nut on and we're just going to ... we're not torquing it right now. We're just pulling the CV axle into the hub. Here, I'm going to fast forward through putting the brakes back together. If you'd like to see this in real time, just check out our video for the Trailblazer brakes and do please keep watching because I do go through torquing the center nut on the hub, as well as some other important information about what you need to do after you've had your brakes apart.
With the tire back on the ground, I'm going to torque the lug nuts to between 100 and 120-foot pounds, kind of just using a crossing pattern. Now here, I'm going to tighten that lug nut to 103-foot pounds. Very important after doing brake work, always pump your brakes many times and then before you do a road test, make sure the brakes hold the vehicle in gear and then do a stop from five miles an hour and ten miles per hour before hitting the brakes.
We hope this helps you out. Brought to you by www.1AAuto.com-- your source for quality replacement parts and the best service on the internet.
Please feel free to call us toll free, (888) 844-3393. We're the company that serves you on the internet and in person.
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Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.
Hi, I'm Mike from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks.
In this video, we're going to show you how to replace a front hub on this 2003 GMC Envoy XL. The items that you'll need for this is a new hub from 1AAuto.com, a 17mm, 18mm, 19mm and 35mm socket and ratchet, a piece of pipe for extra leverage, 18mm wrench, flat blade screwdriver, torque wrench, hammer, and jack and jack stands.
Start off by prying off your hub cap. Then just loosen up this 35mm nut. Now loosen the lug nuts in a crossing pattern. We'll just fast-forward as Mike does this. Once you've loosened them, just jack the vehicle up, and then remove the lug nuts the rest of the way. Now the wheel will pull off.
Now, you want to remove these two 17mm bolts, and you can see Mike's using an 18mm wrench to hold the nut on the inside. That'll just make it easier to remove that bolt. Now, using a flat blade screwdriver, just pry out on the caliper. Then you can just set that aside.
Now pry out your brake pads. Now, you want to remove these two 18mm bolts. We'll just fast-forward as Mike does that, and you can see he's using a piece of pipe for some extra leverage to help break those bolts free. Remove the bolts the rest of the way, and then the caliper bracket comes off. Now, you need to remove your rotor, and hopefully you can just use a hammer, tap on the rotor a little bit, and it will come off. Our vehicle has some corrosion, so we end up using the alternate method.
If you have trouble getting the rotor off, it actually has press holes. You would get a bolt that's the proper size, I believe this an M12 bolt, and you use two bolts, thread them into those holes, and as you tighten them up, they press against the hub and push the rotor off. Once you've removed the rotor, if you haven't already, remove the center hub nut the rest of the way. Give the axle a good firm hit with a hammer, and once you see it's moving, then you know it's free.
Next, you want to disconnect these clips along this harness. To do that, you just flip those open with a flat blade screwdriver, or you can just pry them out. First, pull the harness connection out from the car, and then push the tab and disconnect the harness. We'll just fast-forward as Mike pries out those clips. Just note, that we did just unclip the harness that is connected to the upper control arm and left it in place. Now, just remove these three 18mm bolts that hold in the hub.
First, we're just going to spray the other side with some penetrating oil to help remove them. We'll fast-forward as Mike removes these. It does help to turn the wheels so you have better access to whichever one you're working on at whatever time. Now, using a hammer, just hit the back of the hub to loosen it, and then just slide it off the axle, making sure your harness is pulled through. Then just hammer that backing plate off the hub and pull your harness up and out of the plate.
On the left is the old hub; on the right is the new one from 1A Auto. You can see they're identical, and they'll fit exactly the same. Take your backing plate and feed the harness of your new hub through it. Then put the backing plate into place on the wheel knuckle. You want to make sure that the harness is going up through that top part of the plate. Once you have that lined up, push the hub back onto the axle and into place.
Once it's in place take a bolt and just twist in to hold the plate and hub to the wheel knuckle. Then just replace the other two bolts, and tighten all three of them up. Now, torque each of these to 90 foot-pounds. We left some clips in the body of the car, so you just remove the ones you don't need from your new harness, and the ones you do need just leave on there and push into place on the wheel knuckle. We'll just fast-forward as Mike re-clips the harness all the way along.
Then reconnect the harness. You want to make sure these holes line up in between the two holes that are on the hub, and then you just slide your rotor back into place, and replace a lug nut to hold it into place. You want to check these slides on your caliper bracket, and make sure they're greased up. If they're not, just apply some brake grease to them. Then fit the bracket into place and then just start twisting your bolts by hand and then tighten them up. Torque each of these to 110 foot-pounds. Then just replace your brake pads, and if there's no grease on the ends, just apply some brake grease.
Now, push your caliper back down into place and replace those two 17mm bolts. We'll fast-forward as Mike does that and tightens those up. Now torque each of those to 40 foot-pounds. Replace the hub nut. Remove the lug nut that you put on there to hold the rotor in place.
Put your wheel in place. Then replace each of the lug nuts and tighten them preliminarily. If you're working with air tools, you can tighten up the center nut preliminarily or you can wait and do this on the ground. Now torque each of these to 100 foot-pounds in a crossing pattern. Then torque the hub nut to 103 foot pounds. Then replace your hub cap.
After you've done any work on the brakes, you want to just pump the brake pedal until it firms up. Then you want to do a stopping test from five miles per hour and then 10 miles per hour.
We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.
Tools used
Okay, friends. One of the first things we need to do to start this job is to safely raise and support the vehicle. I like to raise it directly on the frame. Once you have the wheel off the ground, we're gonna remove our center cover. That exposes our 19-millimeter lug nuts. Remove them all, and then remove the wheel. The next thing I like to do is remove the caliper from the bracket directly. The reason for that is because I like to take a look at the pads when I'm taking everything apart. I'm gonna use an 18-millimeter to hold the slider from spinning, and then I'm gonna come right from the backside of the caliper, and I'm gonna remove my 13-millimeter nuts that hold the caliper to the bracket. Okay. I've got both our bolts here. Slide the caliper off. It's always a great idea to inspect the caliper directly. Look along these boots to make sure you don't see any moisture or anything like that, and you also wanna make sure that the piston itself isn't chipped or broken in any way. Let's get the pads off of here. Feels as though this rearward one's frozen in there. There we are. I usually like to turn the wheel a little bit so I can expose these 18-millimeter headed bolts. We're gonna remove both those bolts that holds the bracket to the knuckle. I'm gonna leave that in just a little bit. Remove the other one. Grab that bracket, and remove the other bolt. There it is, friends. Now it's time to remove the rotor.
Next, we're gonna use a little bit of penetrant. We're gonna come right here along where the axle nut is, and then we're gonna come along the wheel bearing where it connects onto the knuckle. We wanna try to spray down that area with some penetrant, and if you can see the bolts coming through the wheel bearing, spray those areas as well. Let's remove that axle nut. The next thing we need to do is make sure that our axle can move around inside the wheel bearing. If for some reason the axle does not slide in and out, take a punch, take a hammer, go right in this center hole, get it to break free. If that's not working, go ahead and spray inside there with some penetrant spray. The next thing we need to do is disconnect and unsecure our ABS wire so when we remove the wheel bearing, it'll be ready to come out. If you were to look at the frame, you're gonna see this area right here. It has a couple wires coming in, a couple wires going out. This area leading towards the front is actually part of the ABS wire we're gonna be removing. So we need to come right here and disconnect this. Just take my little pocket screwdriver. I'll pull it like that until I can see that white piece is pressed up against here, and then you press on this area, and you should be able to take these two apart. There we are.
Now what we need to do is use our little forky tool here or a pry bar or whatever you might have. We're gonna try to get in between this piece and the frame because there's gonna be a little push clip or piton that forces in. I'll show you what it looks like. There it is. That just forces right inside this hole, and it holds it secure. The new wheel bearing is gonna come with all new clips, so you don't have to worry about breaking them. That one out of there. Okay. A lot of times the clips that go up into the control arm, they kinda get stuck up in there. You can try to pry it out of there. More than likely it's gonna break the little piton going up in. So if you wanted to, if you were to look right along this side, you can see an area that we can press with a small pocket screwdriver, and it'll let this come down. That's the way I'm gonna remove this one. Get this one off of here. For this one, you need to squeeze these two tabs right here. Give them a little squeeze with some pliers and should pry off. There we go, friends. Now what we need to do is come from the backside of this knuckle here. If you were to look along where the axle goes through the knuckle, you're gonna see where the bolts are that hold the wheel bearing to the knuckle. We're gonna use an 18-millimeter to remove all 3. There's one of my bolts. Do the same to all.
The next thing that I like to do is use this ABS wire. We're not gonna be reusing it, so this is okay. I'm gonna take it, and I'm just gonna tie it right around the knuckle, just like this. The reason for that is because now what I need to do is start bonking on this with a hammer carefully and try to break it free from the knuckle. When it does break free, the last thing that I want is for it to come shooting off and potentially hurt me. So, this kinda acts as a safety net. Let's go ahead and start hitting this with the hammer. There we are. As you can tell, my safety net worked well. We'll just go ahead and get the backing plate off of here. There it is, friends. The next thing we need to do at this point is to clean up this area. All the areas that you notice where the wheel bearing was sitting up against the knuckle need to be nice and clean. The wheel bearing needs to be able to ground thoroughly through the knuckle. Use something like a scraper, a screwdriver if you have to. You could use a little brush. Use whatever you need to, but try to get off the majority of this rust, especially any raised areas. The next thing we would wanna do is clean up the backing plate the same way. Clean up both sides, the area that's gonna be up against here and then, of course, the area that the bearing's gonna be against. Once you've done that, go ahead and take your bolts. Make sure that they're clean.
These look like they could use a cleanup, so I'm gonna take them to the wire wheel. After I've done that, I'm gonna apply a little bit of threadlocker. So I've got these cleaned up. I've got a little bit of threadlocker on there. The next thing we're gonna do is use a little bit of copper Never-Seez, try to get around the areas where the bearing's gonna be resting in here. It's just gonna help make it come out easier next time. I also like to get the splines on the axle. Now we have our backing plate nice and cleaned up. We did both sides where the bearing's gonna ride like I said. Go ahead and take that ABS wire that comes from your wheel bearing. Slide it right down and through the center there. That's great. Now we're gonna line up the slot with where this is gonna go through, and then we're gonna put the whole unit up on to the knuckle just like this. Now something that's important to remember is that you wanna have the slot in the backing plate facing to where the caliper is. So if I was to put this in like that, it's not gonna be right. You're gonna wanna go twisting it until it lines up right like this. Let's get the ABS wire out of there. Perfect. Let's go ahead and start in those bolts. Now let's just go ahead and bottom out those bolts. Torque these to 77 foot-pounds. Now it's gonna be time to get our ABS wire back resecured.
We wanna make sure that it doesn't get damaged by hanging around and flopping and all that stuff. So, just take a look at it and take a look at all the areas that we left on here for clips. Any of those corresponding areas, we'll just take them off of the new one, okay? So I've got this clip that just comes around back here. It's gonna slide in. That's the one we got with the pliers. You remember that one. We'll bring this up through here. This one, obviously, we can take this off of here. We'll recycle that. Once up here, click it in. Same thing right here. We'll get this one off of there as well. Put this up in here. Latch it in. Make sure you give it a nice tug. All right. So now we're just gonna follow this and put it back in everywhere where it goes in. That one in there. Now we'll clip these together. Make sure you lock it in, give it a nice tug, and then secure it. Double-check all your anchor points. Make sure that there's no way that this ABS wire can come loose. The last thing you want is for it to get damaged. The next thing we're gonna do is get our axle nut back on here. I like to use a little bit of threadlocker. We'll put it on, bottom it out, and then we'll torque it to manufacturer's specifications. Now to torque this axle nut, what you're probably gonna find is that as you try to turn this to tighten it, the bearing's gonna keep spinning. To cure that, you can use a nice long pry bar. Come right in between the lug studs.
You wanna make sure it's nice and flat so you don't damage the threads. Now we're gonna torque this to 103 foot-pounds. Going with the assumption you're not replacing your brakes or your rotors, you're gonna wanna clean up the mounting area that goes up against where the bearing is. Now we're gonna go ahead and spray down this area of the hub with some copper Never-Seez. Put our rotor on, and then grab one of your lug nuts and start it in so it holds the rotor so it doesn't move around. Next, it's gonna be time to go ahead and push in the caliper pistons. What you'll notice, if you were trying to use a tool that looks like this, which is what most people have, is you would go inside like this, squeezing this piston. As you squeeze this one in, this one would start coming out. That could be an issue. If you're using this tool, the best way to do it would be to go ahead and take one of your old brake pads and then go ahead and grip right in the center and squeeze it down. For me personally, I have this tool right here. As you crank it, it's gonna push in both these pistons at the same time. You could also use this at the same time if you wanted to. Put this in. Now we're just gonna slowly push in the pistons. The next step for preparing this is we wanna add a tiny bit of lubricant along the pistons themselves and then along each of these three ears.
The reason for doing this is for vibration dampening and noise reduction. Time to get the caliper bracket on. Go ahead and take your caliper bolts and use a tiny bit of threadlocker. Let's get these started. Torque these to 118 foot-pounds. Now it's gonna be time to get the brake pads onto the vehicle. What you're gonna notice is you should have some wear indicators. They probably came in your little bag. You can go ahead and squeeze that right onto the pads, and you want them both facing just like this. When we install these, we want the brake indicators facing up. See if I can slide this in here. Should slide in nice and easy. If you have to force it in or use a hammer for any reason, you probably didn't clean up the bracket enough. These look great. Make sure they can move around freely. Go ahead and take that caliper and slide it over. Put it right down on there. Now we're gonna grab our caliper mounting bolts. We've got our caliper bolts with a teeny bit of threadlocker. Start them in, bottom them out, and then we'll torque them down. Let's torque these to 31 foot-pounds. It's always a great idea to double-check everything that you removed and replace. Just make sure everything's secure and good to go. Once you've done that, let's go ahead and get the wheel up on here.
Bring the vehicle down so the tire's just barely touching the ground so we can't spin, and then torque the wheels in a crisscross manner to 103 foot-pounds. Now it's gonna be time to get our center cover on here. If you were to turn it around, you might see something that looks a lot like a valve stem. Line it up with your valve stem and then go ahead and pop it on there. All right. Now I know you think you're done, but you still need to pump up the brake pedal, and then we're gonna go out there and double-check that brake fluid level. Right underneath the hood, you're gonna see your master cylinder. It'll tell you what type of fluid to use. You can give it a little shake and just double-check to make sure you can see it's up at that maximum line.
