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Old 08-29-2019, 10:22 PM   #1
blahcomp222
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what why cause dust cover shield rub rotor replace new install? grind squeal noise?

sorry for title, I wanted to put many key words to help anyone else trying to figure this out.

I read many threads people had this happen but no real explanation as to why.

Are new rotors sometimes thicker than OEM? I know break pads don't contact or wear down the outer rim of the rotors where mine is now rubbing, so it's not that but maybe these rotors are like 1/4" thicker than the previous?

I've read threads of people who seem to know a lot about mechanics and installed $500 higher quality rotors and get this problem.

I changed pads and rotors on a 2006 Honda pilot for my sister. About a week later she says there's some sort of leak and bad grinding noise.Turns out the leak was just normal air conditioner drip lol.

I changed pads + rotors like 8 times no problem on various cars, so I didn't want to open up the wheels to check but the thing I noticed that made me open the wheels was the wear indicator tab on the brake pads - I never really gave much thought as to which side of rotor to put that tab but this time I googled and they say to make it so the rotor spins in a way that the tab is ahead of the pad. So as you know the caliper's inside section is the piston and only that piston seats against the back of the inner brake pad. And the outer section of the caliper (towards lug nuts) is sort of a C shape. Well I noticed the C shape side of the caliper (which is where I put the wear indicator) pinches the wear indicator (on some vehicles) because the indicator tab is sometimes secured to the pad in a way that when you install that C side of the caliper only one side of the C is seated against the wear indicator and thus the pad is sort of seated on an angle - so I took the wheels apart to put the wear indicator on the inner side of rotors in case this was causing the noise. As I'm putting it back together I notice the grinding sound that started all this. Then discover it's the rotors rubbing on the dust shield, so I just bent the dust shield back a bit.

But WHY does this happen if not that the new rotors are a bit thicker? When I took the old rotors off, I banged them with a mallet to get them unstuck but even that shouldn't cause the rotor to tilt back and bend the dust cover, and even if it did, the dust cover is bent towards the rotors, not away.
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Old 08-30-2019, 08:19 AM   #2
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Re: what why cause dust cover shield rub rotor replace new install? grind squeal noise?

There's no clearance for new rotors and new pads if the rotors were appreciably thicker than new OEM. When everything is new OEM you have to have the caliper compressed pretty much completely to fit it back together. So thicker rotors than spec is most likely NOT the issue. I suspect more what happened is in the process of fighting the old rotor off you managed to bend the dust shield in some directly. It may have been from a mis-applied blow with the mallet or possibly from walking the rotor off. If this was the type of rear brake where the parking brake is a drum setup inside the hat of the rotor, fighting the rotor off could pull against the dust shield since the parking brake shoes make contact with the dust shield. The dust shields are kind of like pie tins in that pushing back on one end will result in the opposite end moving the opposite direction. So even when attempting to straighten a dust shield, just because you're manipulating one area, the opposite end will also move/deform.



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Old 09-08-2019, 10:32 PM   #3
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Re: what why cause dust cover shield rub rotor replace new install? grind squeal noise?

Quote:
Originally Posted by beepbeepph View Post
Head gasket seals the engine as well as the pathways of oil and coolant. While intake manifold gasket is responsible for delivering the mixture of air and fuel to the cylinders. I think the problem is coming from a head gasket leak due to coolant leaks that result in engine steaming or overheating. But some motors are prone to coolant leaks in their intake gaskets. With this, I think its best to visit your trusted car shop for a thorough diagnostic to avoid problem that could ruin your car completely and risk your safety. Hope this helps!

Did you mean to post this to a different thread? Your response is not at all related to the subject of this thread.


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