![]() ![]() There is no huge reason to buy whole remanufactured caliper set if your pistons are compressing all right with an extra large pliers or a special tool–that means your pistons are working fine. With time, my ‘half-rubber-tube’ jig might become the ‘new normal’ as the friction increases due to loss of grease and rust issues.Īll said and done, I did order new two sets of rubber boots/jackets (just in case and made by different manufacturers and they do have different shapes) and two new sets of pins (total of 4) for both wheels…for whenever I may get to do them again normally or if they start sticking again. The release of the breaks causes sudden depressuarization in that break system arrea, and I believe it is not gradual. Here is the crux of the matter–I think they prevent the snap back effect, which could be construed as a ‘rattle’ as some have pointed out. It is all hard to say with surety, but I thought I heard brakes snap back a few times when breakes were released as I drove… only a few times. It works fine but I am sure the pins slide more freely than they were designed for. I went with that and assembled everything together (new rotor and break pads having been installed.) ![]() With less rubber friction the pins moved freely! Viola. I threw one away and left the other half of it on. One can observe the jacket being really loose and sliding easily due to rubber deterioration and edges of it frayed.Īfter few futile attempts the rubber jacket finally tore into two pieces. I cleaned the rust, then tried to installed with the old rubber sleeve all packed with gooey grease the above mentioned pin back to no avail–it would stick and wouldn’t go in as the rubber jacket slid. I’ve had a hard time removing my rusty pins out, and only the ones with the inner boot, and it probably was most likely due to extreme pressure created by deteriorating/expanded/loose/and breaking apart rubber jacket (in addition to rust problem.) 1A Auto has thousands of how-to videos with step-by-step instructions and tips from professional mechanics. Learn how to diagnose and replace parts on many makes and models. ![]() So does this theory make sense? Do you have a better explanation of what the rubber caliper bolt sleeve actually does? Tells us in the comment box below. However, when that rubbery sleeve prevents the caliper bolt from sliding, or rust begins pulling the vehicle back into the earth, all bets are off. It works similarly to a shock absorber, where it slows down and dampens the movements of the calipers.Īs long as the whole system stays rust-free and lubricated, it’s truly a simple and effective system. The sleeve provides additional friction, which prevents the brake caliper from rattling/chattering within the confines of the caliper bracket. ![]() These cute little rubber caliper bolt “sleeves” (that’s the most common name for these) are anti-rattle devices for the calipers. However, I have spent quite a few late night hours in search of the truth, and I’m now here to share with you the one theory that makes the most sense to me. The upper caliper bolt does not have this cute rubber sleeve, so why in the world did the car manufacturer put one on the bottom caliper bolt? The truth is, I don’t have an answer for that. If you have ever successfully removed this bolt (which not many have in the Northeast), you know that it has a rather cute little rubbery sleeve on the end of it as if to mock each one of your herculean removal efforts. A Theory: The Brake Caliper Slide Pin Rubber Is an Anti-Rattle Device That’s the bolt we’re talking about here today. It’s the threaded evil that requires a chisel and sledgehammer to remove when the ratchet fails to do its one job. It’s the bolt that gives you a few hope-filled turns with a pipe-extended, half inch drive ratchet, and then crushes your dreams when it becomes stuck solid for absolutely no logical reason. This is the type of bolt that doesn’t want to come out of its hole because rust has essentially fused it with the brake caliper bracket. If you have ever had the pleasure of doing a brake job on a rusty car before, you have likely encountered the engineering nightmare that is known as a “lower brake caliper slide bolt.” Now, if you have erased this hardware-laden memory from your brain, or aren’t familiar with this style of bolt, I’ll do my best to help out. Why Is There a Rubber Sleeve on the Lower Brake Caliper Bolt? ![]()
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