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what will cause dust cover shield rub after rotor replacement?


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blahcomp222
User

Aug 29, 2019, 8:23 PM

Post #1 of 3 (710 views)
what will cause dust cover shield rub after rotor replacement? Sign In

 
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.


(This post was edited by Hammer Time on Aug 30, 2019, 4:02 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 29, 2019, 11:03 PM

Post #2 of 3 (702 views)
Re: what why cause dust cover shield rub rotor replace new install? grind squeal noise? Sign In

That's a lot to read and respond to all at once but I'll give it a try.
Quote you ">Are new rotors sometimes thicker than OEM? <" NO! Correct OE size for new not different.
Rubbing backing plates: Not a new problem is frequently from jacking up vehicles improperly bent things or just cheap junk parts. Each one is treated for what you see to bend it out of the way or replace if need be. Lots of problems come from improper hoisting of vehicles when in doubt where to place lifting device and jack stands don't guess, know each vehicle where things are placed. They are NOT all the same.
Wear sensors: Those are intended as a warning should be put on inside pad towards rear or down on assorted applications such that it's likely to make noise first before more problems. YOU check adjustment when new that they are NOT bent too far in new - dropped or wrong new or bend from handling.
Basics on disc brakes any vehicles about now: Do NOT just push back pistons to make room for new pads and rotors rather bleed out as they go back. This is time to think and watch if they are worthy of going another round or not also. Always replace hardware and grease the parts as per each type would require or risk failure early.


Suggestion: Save old parts and match to new, however acquired see if they are correct. AYOR with cloned parts. It can be hard to know too many not marked.
Brakes should be tested out when finished that they perform before put to real use if only to double check they are working properly most will work better after a short tie of use than when all new,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 30, 2019, 4:01 AM

Post #3 of 3 (698 views)
Re: what why cause dust cover shield rub rotor replace new install? grind squeal noise? Sign In

Yep, way too much typing for this issue.
As Tom already stated, the rotor size does not change. If the backing plates are rubbing, it'd because you bent them while doing the job. It's not rocket science, simply a bent piece of tin.

There is also no need to make an unreadable title. I will correct that.



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