Passenger side rear brakes making a metallic grinding noise - Chevy Impala Forums
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post #1 of (permalink) Old 08-25-2016 Thread Starter
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Passenger side rear brakes making a metallic grinding noise

Hello I have a 2006 Impala SS 161k miles

About 2 months ago I had a mechanic replace my brake pads both front and back.

Now the passenger side rear brakes are making a metallic grinding noise... I heard no squealing noise that usually comes with wearing brake pads. Looked at the rotor and there a clear signs of grinding. As well as brake dust/metallic dust on the rim. So I would assume the brake pads are bad.

But how would they get this bad this fast to the point were its grinding the rotor?
Why would only one set of brake pads go out just like that? The rear brakes at that?


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Last edited by Nstaten2; 08-25-2016 at 07:21 PM.
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post #2 of (permalink) Old 08-25-2016 Thread Starter
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Sorry not caliper, I mean rotor


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post #3 of (permalink) Old 08-25-2016
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Mine are doing the exact same thing, both on the Monte Carlo and the Impala. On the Monte, it seems like when I turn right it's bad. On the Impala, if I turn left, it's faint but noticeable and that's how the Monte started.

I'm thinking it has to be warping or some sort of rust buildup on the inner or outer edge of the rotors themselves. The Monte can give a bad vibration but the Impala is smooth while making a similar sound. Think these cars just eat rotors as candy. Which, if that's the worst it gets, I can deal!
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post #4 of (permalink) Old 08-26-2016
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Sounds to me like you need to get the mechanic who put on the new pads to check for a bad one. If it makes a grinding noise every time you apply the brakes, there is definitely a problem.
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post #5 of (permalink) Old 08-26-2016 Thread Starter
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post #6 of (permalink) Old 08-26-2016 Thread Starter
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Where you see silver is where it's been grinding at


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post #7 of (permalink) Old 08-26-2016
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Quote:
Originally Posted by Nstaten2 View Post
Hello I have a 2006 Impala SS 161k miles

About 2 months ago I had a mechanic replace my brake pads both front and back.

Now the passenger side rear brakes are making a metallic grinding noise... I heard no squealing noise that usually comes with wearing brake pads. Looked at the rotor and there a clear signs of grinding. As well as brake dust/metallic dust on the rim. So I would assume the brake pads are bad.

But how would they get this bad this fast to the point were its grinding the rotor?
Why would only one set of brake pads go out just like that? The rear brakes at that?
Looking at the pics, it appears that the pad is worn all the way down to the rivets. Or at least down to the sensor.

Several thoughts on this...

One is that you have a bad master cylinder, but I doubt that's the case. If it fails to suck the piston back when the pedal is released, you could get accelerated brake wear, but I would expect that on more than one wheel.

Two would be that the right rear brake was not bled properly and has air in it which is causing the pad to ride on the rotor thus causing premature wear.

Three would be that the glide pins are sticking, causing the caliper to be biased to one side resulting in one pad wearing (much) faster than the other. (The piston side pad releases, but the other side doesn't move much and rubs the rotor.) I've also seen where too much grease was packed around the glide pin which can also push the caliper to one side.

BTW, Do you see any signs of brake fluid leaking?

My take is either 2 or 3, both of which can cause one pad to get worn while the mating one still looks new. I'd put a new pad on it, bleed it, and inspect the glide pins, making sure the caliper can move freely both ways.

One last thought - what kind of pads are they (ie, material)? Cheap pads can wear extremely fast if there's an issue as described above. You want to be sure your mechanic didn't tell you one type, then put some cheapos on instead.

HTH.

Doug

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post #8 of (permalink) Old 08-26-2016
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Quote:
Originally Posted by Nstaten2 View Post
I heard no squealing noise that usually comes with wearing brake pads.
It seems like, while keeping all my fleet in service, that we only get the warning squeal from the sensor about half the time. All too often, we don't know about it until they start grinding.

When I put new pads on, I inspect them to be sure the sensor is positioned properly so that it will engage the rotor BEFORE the pad is paper thin. But my kids still bring me cars with chewed up rotors.

I do seem to recall one situation where, when I asked about squealing, one of my kids replied, "It did it for a while, but then it stopped, so I figured it had fixed itself."

Doug

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post #9 of (permalink) Old 08-26-2016 Thread Starter
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Passenger side rear brakes making a metallic grinding noise

Quote:
Originally Posted by plano-doug View Post
Looking at the pics, it appears that the pad is worn all the way down to the rivets. Or at least down to the sensor.

Several thoughts on this...

One is that you have a bad master cylinder, but I doubt that's the case. If it fails to suck the piston back when the pedal is released, you could get accelerated brake wear, but I would expect that on more than one wheel.

Two would be that the right rear brake was not bled properly and has air in it which is causing the pad to ride on the rotor thus causing premature wear.

Three would be that the glide pins are sticking, causing the caliper to be biased to one side resulting in one pad wearing (much) faster than the other. (The piston side pad releases, but the other side doesn't move much and rubs the rotor.) I've also seen where too much grease was packed around the glide pin which can also push the caliper to one side.

BTW, Do you see any signs of brake fluid leaking?

My take is either 2 or 3, both of which can cause one pad to get worn while the mating one still looks new. I'd put a new pad on it, bleed it, and inspect the glide pins, making sure the caliper can move freely both ways.

One last thought - what kind of pads are they (ie, material)? Cheap pads can wear extremely fast if there's an issue as described above. You want to be sure your mechanic didn't tell you one type, then put some cheapos on instead.

HTH.

Doug

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No brake fluid leak... And they were semi metallic brake pads. And thanks for your input. I'm gonna look into that right now.

Also, would it be ok to put new brake pads on the same rotor. Should I have the rotors machined first?


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post #10 of (permalink) Old 08-26-2016
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Quote:
Originally Posted by plano-doug View Post
"It did it for a while, but then it stopped, so I figured it had fixed itself."


Doesn't that seem to usually be the case? Wife does stuff like that to me all the time.
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post #11 of (permalink) Old 08-26-2016
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Quote:
Originally Posted by Nstaten2 View Post
Also, would it be ok to put new brake pads on the same rotor. Should I have the rotors machined first?
In the past, I was a stickler for machining the rotors or replacing them. But as I've gotten more experience (and lazier) I've experimented with just pad replacement, even on a rotor that showed wear like in your pics, and had good results.

I just put new fronts on my 99 Lumina the other day, and one side of one rotor was a bit chewed, but they seem to be working fine. The pedal feels good, and there's no indication of any problems - no pulling to one side under braking, for example. So, I suggest just putting new pads on that one corner (using the same type/brand) and see how it goes.

If it really needs machining and you don't do it, there won't be any catastrophic failures. You'll get some brake noise, and maybe some pulling. That's about all.

And keep in mind, the new brake pad will do a decent job of machining the rotor for you

Doug

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post #12 of (permalink) Old 08-26-2016
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Quote:
Originally Posted by plano-doug View Post
It seems like, while keeping all my fleet in service, that we only get the warning squeal from the sensor about half the time. All too often, we don't know about it until they start grinding.

When I put new pads on, I inspect them to be sure the sensor is positioned properly so that it will engage the rotor BEFORE the pad is paper thin. But my kids still bring me cars with chewed up rotors.

I do seem to recall one situation where, when I asked about squealing, one of my kids replied, "It did it for a while, but then it stopped, so I figured it had fixed itself."

Doug

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I fear the day the wife pulls this one on me....UGH!!!!
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post #13 of (permalink) Old 08-26-2016 Thread Starter
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Quote:
Originally Posted by plano-doug View Post



If it really needs machining and you don't do it, there won't be any catastrophic failures. You'll get some brake noise, and maybe some pulling. That's about all.



And keep in mind, the new brake pad will do a decent job of machining the rotor for you



Doug



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Music to my ears... Appreciate the advice


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post #14 of (permalink) Old 08-26-2016
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Quote:
Originally Posted by Joes74challenger View Post
I fear the day the wife pulls this one on me....UGH!!!!

It will happen, trust me.

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post #15 of (permalink) Old 08-26-2016
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You may also go through brake pads faster if the rotor is chewed up. Personally, I'd either replace the rotor or have it cut (aka "turned"). Just my opinion though!

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