Why Your Car Brakes Are Making Noise - Squeaking Screeching Scraping Grinding Brake Noise

hey this is Joshua budget mechanic today I'm gonna be talking to you about break noise and I would separate the categories break noise into two groups squeaking and grinding and there's a lot of reasons why these noises happen and we're gonna go over the main ones right now before we get into the specific break sounds let me just show you basically how a break system works these are brake pads and this is a brake rotor and these pads are squeezed on either side of the rotor til the rotor stops and that's what slows your car down these are gonna be on the front of your vehicle and on a lot of vehicles especially older ones in the rear instead of having a disc you're gonna have a drum and it's the same principle but instead of the pads squeezing on the outside of the surface pads or shoes as they're called in the rear press against the inside so you're going to have two shoes that press out against the inside and slow it down this is a motorcycle one just so you can see the the shape and then this mechanism pushes them outwards so that it slows your car down a lot of newer cars have discs or rotors on the front and the rear but sometimes you'll have both on one car so the first category of brake noise we want to talk about is squeaking [Applause] and the most common reason for that is your brake pads wearing out so you have a metal plate glued to that is a composite material which actually contacts your rotor and stops the car but that eventually will wear out over time and most brake pads have these little indicator Clips installed on them if they're installed correctly and those will start to squeak before your brake pad completely runs out and it's designed so that it touches the rotor and makes a squeaking noise that you hear most times you'll hear it when you're not applying the brakes you're just going down the road it'll start squeaking or when you're in Reverse often you'll start to hear it and then when you press the brakes the sound goes away so if you're hearing that and it has those conditions it's probably time to check your pads out this is a brand new pad quite a bit of meat on there this is an older pad obviously a different car but getting quite low and quite a big difference this one's about to hit the indicator another really common reason for squeaking is brake glazing and that happens when your brakes overheat here on the Big Island of Hawaii we run into this a lot because we have a lot of steep hills high temperatures and if you're riding down a long steep hill and you're just holding the brakes the whole way down it's creating a lot of heat and that's eventually going to glaze your pads and rear rotor another way this it can happen is if you leave your emergency brake on and you drive away drive for a couple miles create so much heat that it actually starts burning them stuck calipers will do this there's a lot of reasons but essentially if your brakes are being pressed for too long too hard they'll overheat and what this does actually is it changes the surface of this pad which is it looks hard but it's actually a fiber it's a it's a bunch of fibers that are meant to to really grab the disc but they get glazed or burned and they get hard and really slippery so instead of grabbing your rotor it just slides right or right across it and doesn't stop you as well and also creates a squeaking noise you'll see this on the pad with the surface being more shiny than it is right now this is kind of a mat you'll see it on the rotor the rotor brand-new one is smooth but it's got these you know these these lines in them but when they become a mirror-like surface then you know you've got a glazing problem so if you have great glazing you'll often hear the sound right as you're rolling up to a stop sign right as you come to a stop you'll kind of hear it squeak or sometimes the first thing in the morning you'll kind of hear it as you as you're leaving your first time you hit your brakes you'll hear it it depends on how bad the glazing is as to when you'll hear but it can be confused with a low brake pad sound which is why you want to get in there and check things out unfortunately once you glaze your pads your rotors are both you need to get it fixed it's not going to go away so you need to get your rotors resurfaced or replaced and put on some new pads another really common reason for brakes squeak is foreign contaminants getting into your brakes and this could be dust this could be water rocks rust so say you're driving on a really dusty road your brake pads are getting covered in dust you may start to get that squeak because it's filling in the porous cracks of your pads and not grabbing like it's supposed to another really common reason you get it is it rains at night and you get a thin film of rust on your metal rotor so the first time you go to stop there's kind of a rusty dust on there and you'll get the squeak as well if you ever noticed you drive through a big puddle and water gets all through all of your brakes you'll get that squeak just briefly because there's water in there messing with your surfaces more you'll get a little rock stuck in in the pads maybe in the cracks or something like that you'll get squeak so it's something that usually will go away as soon as the contaminant is it wears off so it's not usually something that's permanent the fourth reason for brakes squeak which is not as common but definitely happens is issues with worn out or improperly installed brake hardware so by Hardware I mean the little retaining clips that hold your pads into the calipers the little indicator squeaker there's a lot of parts to brakes and they need to be clean they need to be functioning properly and some of the most common are you want to clean and lube the parts of the brake that are moving in and out with your brake pedal to make sure nothing sticking otherwise you'll get squeaking noise sometimes it is possible to get vibrations between the pad and the metal of the of the caliper you can use the disk break quiet on the back of the pad so that there's not that micro vibration obviously if someone forgets to put in a piece of hardware you'll get vibrations and stuff happening that will cause squeaking mismatched hardware if you replace your rotor or your pads but not the other they're not quite mating properly and you'll get you'll get funky sound so it really depends on what's going on as to when you'll hear the noise but if you're not experiencing any of the squeaking issues that I mentioned previously might be time to check out your hardware the second category of brake noise that you would hear is a grinding or a scraping noise usually the the reason that happens is your brake pad has completely run out of pad material and now you're the metal backing plate is actually starting to rub on the metal of the rotor so it's metal to metal it's just a nasty scraping grinding sound and you'll feel it in your brake pedal you're gonna know right away it's probably gonna happen pretty suddenly like one day it won't be there in the next day it's going to be there and by the time you're hearing and feeling that noise it's too late your pad is obviously gone and you also are really tearing up your rotor as well so you can look down inside your wheel and you'll see deep grooves in your rotor unless it's starting to happen on the inside in which case you wouldn't be able to see it from the outside but by then it's time for new pads and new rotors a second common reason for that scraping grinding noise you'll hear from your brakes is due to overheating again like we talked about before when when your brakes get too hot the material of your brake pad actually starts to break down you can see on this pad where it's gotten hot it's created a pitted pitted surface that is no longer nice and smooth and it can in some cases create a really uneven almost like a sponge-like surface that really does not rub the road or evenly and you'll get kind of a grind ding sound it's different than running out of pad in that it's not gonna ruin your rotor as fast but it's definitely going to not work as effectively and have a scraping grinding sound for some reason I often run into it with rear brakes people run with the the e brake on for too long and then whenever they come to a stop sign and hit their brakes and they hear in the back like a kind of a scraping grinding now there are gonna be other things that would cause your brakes to squeak or scrape but the majority that sounds you're going to encounter are going to be something that we cover here today well I hope this takes some of the mystery out of your brake sounds and thanks for watching we'll see you again next time

Channel: Budget Mechanic Hawaii

Views: 785,887

Keywords: Brake Noises, brake squeaks, brakes grinding, brakes, brakes squealing, brakes scraping, car brakes screech, brakes screeching, brakes rough, brake noise in reverse, brake noise when turning, what is brake noise, release brake noise, brake scraping while driving, brake scraping noise while driving, noisy brakes when stopping, new brakes squealing, new brakes squeaking when driving, new brakes noise low speed, new brakes noise, brake pads, brake rotors noise

Id: K-8-XB9NuM4

Length: 8min 45sec (525 seconds)

Published: Thu Dec 19 2019