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new pads, new rotors but brake grinding sound, why?

 
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Old 02-27-2012, 08:21 PM
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new pads, new rotors but brake grinding sound, why?

Hey friends. Here's my situation. Changed all four rotors (purchased from iRotors on eBay with ceramic pads). They've been on for a few weeks now when I noticed a strong grabbing feel/grind sound when I apply the brakes, especially when I brake and turn. Today I took off the wheel and noticed a scratches all over the rotor from the brakes, none of the other ones seem to have anything wrong with them. I also noticed the front pad had much more wear to it than the rear pad.

Doesn't seem like the brakes are sticking or anything is wrong with the bearing because both tires turn with ease when I had the front end jacked up. Doesn't seem like anything is wrong with caliper either.

What could be the issue that's causing this?
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Old 02-27-2012, 08:45 PM
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Re: new pads, new rotors but brake grinding sound, why?

easy way to check a bearing is to turn side to side while driving straight in a slight S pattern and listen for a loud whurring noise.. but cheap pads could be an issue... more info would be nice
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Old 02-27-2012, 08:53 PM
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Re: new pads, new rotors but brake grinding sound, why?

Yeah I'm quite positive it isn't a bearing issue, I forgot I had that bearing changed just about a year ago. I've had bearing issues before, pretty easy to diagnosis.

As far as more info, I'm not sure what else to add lol. I noticed it about a week ago when I came to rolling to a stop and especially when I applied the brakes hard. Then I noticed it even more when I was braking and turning into it at the same time. I wouldn't describe the sound as grinding but it sounds like pads are gripping it hard, which I can see from the scratch pattern that only appears on the one rotor.
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Old 02-27-2012, 09:35 PM
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Re: new pads, new rotors but brake grinding sound, why?

Dust shield hitting the rotor?
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Old 02-27-2012, 09:40 PM
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Re: new pads, new rotors but brake grinding sound, why?

Nah. Definitely seems like pad and rotor friction seeing as the front pad is already looking really wore and there are tons scrape marks all around the rotor in the same place that the pad would make contact.
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Old 02-27-2012, 09:49 PM
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Re: new pads, new rotors but brake grinding sound, why?

ive put cheapy pads on a friends car and thats what it sounded like... did you by chance take the anti squeel pad off or something?
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Old 02-27-2012, 09:55 PM
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Re: new pads, new rotors but brake grinding sound, why?

It's not so much the sound I'm concerned with, it's really not loud at all, it's the incredibly noticeable marks its leaving in my rotor that have me worried. When you look at it it almost looks like the brake is stuck but it isn't sticking.
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Old 02-27-2012, 09:55 PM
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Re: new pads, new rotors but brake grinding sound, why?

I'm not too familiar with anti squel pad, those little metal shims?
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Old 02-28-2012, 12:17 AM
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Re: new pads, new rotors but brake grinding sound, why?

ya they are the shims on the outside of the pads. have you removed th pads and visually inspected them? there might be some crap caught in the middle split on the friction side. the cradle or the caliper isn't interfering at all? there has to be something foreign stuck somewhere in your assembly there's nothing foreign stuck on your wheel that might be doing it?
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Old 02-28-2012, 12:20 AM
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Re: new pads, new rotors but brake grinding sound, why?

Did you properly bed the pads in or did you just go crazy and started going 60mph then hit the brake? Brakes aren't as easy as take out the old and putting the new sometimes you gotta bleed the brakes slowly and slightly and Always properly bed in the new pads otherwise all that work is for nothing and you often damage the brake system.
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Old 02-28-2012, 12:40 AM
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Re: new pads, new rotors but brake grinding sound, why?

Cheap ebay pads... I go Hawk performance pads or EBC all the way.. If im trying to go cheap, like on my girls beater daily driver, just some pads from autozone. cheap, warrantied, do job, and for the most part last as well.
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Old 02-28-2012, 02:17 AM
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Re: new pads, new rotors but brake grinding sound, why?

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Originally Posted by MUGENBB4JDM View Post
Did you properly bed the pads in or did you just go crazy and started going 60mph then hit the brake? Brakes aren't as easy as take out the old and putting the new sometimes you gotta bleed the brakes slowly and slightly and Always properly bed in the new pads otherwise all that work is for nothing and you often damage the brake system.
I didn't bleed the brakes, I just replaced them and pumped on the brake pedal while it was in the garage. I don't know, it's not the first time I've changed the pads and everything went fine before :(

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Cheap ebay pads... I go Hawk performance pads or EBC all the way.. If im trying to go cheap, like on my girls beater daily driver, just some pads from autozone. cheap, warrantied, do job, and for the most part last as well.
Think just the pads alone would do this? If so, that would be lovely. I think I'll pick up some new pads and try it out. If it does the same, maybe the rotor is ****?

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ya they are the shims on the outside of the pads. have you removed th pads and visually inspected them? there might be some crap caught in the middle split on the friction side. the cradle or the caliper isn't interfering at all? there has to be something foreign stuck somewhere in your assembly there's nothing foreign stuck on your wheel that might be doing it?
I didn't really pay much attention to the shims to be honest. But I'll give them an inspection. The caliper seems fine, brakes were fine before changing pads and rotors.
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Old 02-28-2012, 08:10 AM
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Re: new pads, new rotors but brake grinding sound, why?

Did you tighten the wheel/lugs correctly?
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Old 02-28-2012, 11:11 AM
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Re: new pads, new rotors but brake grinding sound, why?

Could be cheap pads, in which the pads are not breaking down correctly. Instead of dust, it's more like chipping away. The chips or pieces of the brake pad are stuck between the rotor and the pad, which causes scaring. In that case get new pads for the front, and get some quality made ones.
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Old 02-28-2012, 11:46 AM
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Re: new pads, new rotors but brake grinding sound, why?

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Did you tighten the wheel/lugs correctly?
Yeah. I should add that I took the tire off last night, took the caliper and pads off to take a look at them, seemed fine so I put it all back together and the same thing is happening.

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Could be cheap pads, in which the pads are not breaking down correctly. Instead of dust, it's more like chipping away. The chips or pieces of the brake pad are stuck between the rotor and the pad, which causes scaring. In that case get new pads for the front, and get some quality made ones.
I think I'm going to grab some AutoZone pads today. Just bums me that this new rotor I have is already scarred and scratched to ****.
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Old 02-28-2012, 02:19 PM
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Re: new pads, new rotors but brake grinding sound, why?

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I'm not too familiar with anti squel pad, those little metal shims?
yes its the metal backing plate on the pad..
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Old 02-28-2012, 02:23 PM
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Re: new pads, new rotors but brake grinding sound, why?

id grab a new set of pads as rebel luder98 said those two brands are HP and it will only stop the noise and make your braking performance higher
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Old 02-28-2012, 03:14 PM
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Re: new pads, new rotors but brake grinding sound, why?

You Don't need $80 Brake pads like the HP's and EBC's so they don't squeak! You can get good pads at O'reillys or Autozone. Just make sure their ceramic. O'reillys has the Bestbrake and Autozone has the Cmax pads. Both are great pads with lifetime warranty. And what type of pads do you have now? Non asbestos? Semi-Metallic? those are the cheaper type of pads.
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Old 02-28-2012, 08:02 PM
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Re: new pads, new rotors but brake grinding sound, why?

Did you grind the caliper brackets down on where the pad slides onto and lube up the slide pins?
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Old 02-28-2012, 09:13 PM
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Re: new pads, new rotors but brake grinding sound, why?

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Originally Posted by MUGENBB4JDM View Post
You Don't need $80 Brake pads like the HP's and EBC's so they don't squeak! You can get good pads at O'reillys or Autozone. Just make sure their ceramic. O'reillys has the Bestbrake and Autozone has the Cmax pads. Both are great pads with lifetime warranty. And what type of pads do you have now? Non asbestos? Semi-Metallic? those are the cheaper type of pads.
OFF Track for a sec since OP hasn't informed us if he got the pads yet.

Just to correct some misconception about "lifetime warranty"
It's actually limited lifetime warranty, which is limited to the pads being defective themselves. Such as you installed them, and they cracked right down the middle due to poor manufacturing. But if you used them for 40,000 miles it cannot be warrantied. Why? Well because that the life expectancy of the pads are around 45,000 miles or so. To further think about it, let's say you opened your own Autozone and you offered lifetime warranty pads. You would make the initial profit, but screwed yourself in the long run for future profits.
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Old 03-06-2012, 09:43 AM
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Re: new pads, new rotors but brake grinding sound, why?

Just an update, changed all pads, braking smoooooth. Thanks for the help.
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Old 03-06-2012, 09:47 AM
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Re: new pads, new rotors but brake grinding sound, why?

So it was el cheapo pads, eh?
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Old 03-06-2012, 10:15 AM
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Re: new pads, new rotors but brake grinding sound, why?

if they were nice performance pads they will make noise and sound horrible. they are designed for race track and good stopping, road noise inst much of a concern at that point so they sound horrible and grind but work amazing
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Old 03-07-2012, 10:50 AM
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Re: new pads, new rotors but brake grinding sound, why?

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So it was el cheapo pads, eh?
Yeah, brakes feel so much better now. I forget the name off the top og my head but I'll check the name when I got home. The guy from NAPA who always sells me parts (also a Prelude owner) highly suggested them and I got front and rear with new metal spacer shimmys for about $80.
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if they were nice performance pads they will make noise and sound horrible. they are designed for race track and good stopping, road noise inst much of a concern at that point so they sound horrible and grind but work amazing
Not only did they sound horrible but they were scratching my rotors to ****. I highly doubt I got performance pads in an eBay bundle.
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