EnglishSubtitle: added by anonim
How to Replace Rear Brake Pads : About Compressing a Caliper
1 00:00:01,750 --> 00:00:04,390 MARK BLOCKER: Okay. In this segment, we're going to cover compressing the rear caliper. 2 00:00:04,390 --> 00:00:09,440 The rear caliper on this system, because the parking brake is integrated with the caliper 3 00:00:09,440 --> 00:00:15,759 is different than your standard brake caliper where you use like a pair of pliers or maybe 4 00:00:15,759 --> 00:00:20,289 a C-clamp to compress the caliper in where it's just hydraulic fluid behind it and you're 5 00:00:20,289 --> 00:00:24,260 just squeezing-- compressing the caliper back in, so you have enough turns to put your pads 6 00:00:24,260 --> 00:00:31,800 back in. Because this system uses a parking brake integrated with it, the center piston 7 00:00:31,800 --> 00:00:35,550 actually, for the parking brake application when you apply park and the brake lift up 8 00:00:35,550 --> 00:00:40,250 on the handle, it pulls on a cable and that cable pulls a ratchet which turns the piston. 9 00:00:40,250 --> 00:00:46,379 It actually forces it out into the--make contact with the brake pad under the rotor to give 10 00:00:46,379 --> 00:00:52,50 you the rear brakes for the parking brake application. And they use a mechanical device 11 00:00:52,50 --> 00:00:56,250 rather than trying to use a hydraulic device. Whereas you put your foot on the brake, it 12 00:00:56,250 --> 00:01:01,520 gives you hydraulic pressure to stop the car. You have to continue the hydraulic pressure 13 00:01:01,520 --> 00:01:05,660 there in order to lock the break or hold pressure against the brake. That can't be done when 14 00:01:05,660 --> 00:01:10,970 you're out of the vehicle in those methods. So, they came up with the ratchety mechanical 15 00:01:10,970 --> 00:01:15,402 mechanism to hold the piston against the brake pads to give you pressure there for you for 16 00:01:15,402 --> 00:01:20,820 use of the parking brake. So, you simply just can't squeeze that back in like you would 17 00:01:20,820 --> 00:01:25,450 a standard caliper. That one has to be twisted and turned as it's pushed in. It's kind of 18 00:01:25,450 --> 00:01:33,79 a simultaneous thing where you're twisting and pushing inward at the same time. They 19 00:01:33,79 --> 00:01:39,590 have a specialty tool designed specifically for that. It can be gotten at most any auto 20 00:01:39,590 --> 00:01:44,920 repair place where you pick up parts or tools and equipment for automobile repair. It's 21 00:01:44,920 --> 00:01:52,649 a small cube that has various points of contact on there for depending on your point of application, 22 00:01:52,649 --> 00:01:57,20 because this system is used on a lot of the newer cars with rear disc brakes. This tool 23 00:01:57,20 --> 00:02:04,180 provides you with the different fasteners or different teeth requirement, a lot of them 24 00:02:04,180 --> 00:02:12,599 are spanner type socket wrench. But it gives you an assortment of six different combinations 25 00:02:12,599 --> 00:02:15,470 depending on the application of the vehicle that you're using. In this particular one, 26 00:02:15,470 --> 00:02:21,569 there's two different sides that have round pivot points on it, and this is the narrower 27 00:02:21,569 --> 00:02:28,170 of the two sides that I'm going to use for this caliper here. The tool would cost between 28 00:02:28,170 --> 00:02:33,90 $5 and $15. It's highly recommended. The money you're going to save by doing your rear brakes 29 00:02:33,90 --> 00:02:38,530 by yourself the first time will pay for the tool. If you can't find it, don't have accessibility 30 00:02:38,530 --> 00:02:42,361 to it, can't get it or for whatever case you don't have it with you, and at that time, 31 00:02:42,361 --> 00:02:46,349 there's a couple of other methods that you can use to press that caliper. One of which, 32 00:02:46,349 --> 00:02:52,940 if you just took a large channel lock if you look at the caliper itself, the piston has 33 00:02:52,940 --> 00:02:58,569 got notches in it. There are four of them. And that's the selection you want to choose, 34 00:02:58,569 --> 00:03:04,870 whichever application, drive or fits in those correctly, and fits snugly, and you'll turn 35 00:03:04,870 --> 00:03:09,40 it with an extension and a ratchet. If you don't have that available, you can grip it 36 00:03:09,40 --> 00:03:14,670 on the outer edge only, just out here on the very edge. You don't want to go pass where 37 00:03:14,670 --> 00:03:19,569 the rubber boot is or drip at all where the rubber boot is; that's going to damage a portion 38 00:03:19,569 --> 00:03:25,540 of the piston that uses a seal for the boot to prevent dust and contaminants from getting 39 00:03:25,540 --> 00:03:30,970 inside caliper assembly. And you just grip it on the outside by the very edge, and as 40 00:03:30,970 --> 00:03:35,519 you're twisting you want to turn it in counterclockwise position, you also want to be providing the 41 00:03:35,519 --> 00:03:40,730 downward force. This is kind of tricky and cumbersome, and it's going to slip off on 42 00:03:40,730 --> 00:03:44,959 you if you're not careful and you could pinch your finger or thumb. So if you use this method, 43 00:03:44,959 --> 00:03:51,370 go very slowly and be very careful because you don't want to mar up those surfaces and 44 00:03:51,370 --> 00:03:56,810 you don't want these pliers to slip off and grip or injure your fingers. That's one alternative 45 00:03:56,810 --> 00:04:05,530 method. Another alternative method you could use is a small wrench that's just large enough 46 00:04:05,530 --> 00:04:09,40 to span the distance between the two points and big enough to have to make contact into 47 00:04:09,40 --> 00:04:13,400 the two grooves, then you push in with this, using a pair of pliers or a presser and slide 48 00:04:13,400 --> 00:04:20,160 it on the end of the wrench, that's where [INDISCERNIBLE] in the grooves and that gives 49 00:04:20,160 --> 00:04:25,50 you the leverage that you need. And then you could twist and turn in with the piston in 50 00:04:25,50 --> 00:04:31,780 that format. Okay, now I'm going to show you a procedure for compressing the caliper and 51 00:04:31,780 --> 00:04:34,910 I've given you a couple of different options. If you don't have the specialty tools that 52 00:04:34,910 --> 00:04:39,440 are readily available, we'll go ahead. That will conclude how to compress the piston in 53 00:04:39,440 --> 00:04:46,669 the rear brake caliper with the parking brake mechanism. Watch our next segment, we're going 54 00:04:46,669 --> 00:04:51,440 to do the actual compressing the caliper with the specialty tool, rear brake system with 55 00:04:51,440 --> 00:04:52,110 parking brake.
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