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New brake pads grinding.

Posted on 1/3/24 at 10:10 am
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36035 posts
Posted on 1/3/24 at 10:10 am
So I changed my front brake pads and the new ones are grinding in both sides.

It seems the old ones didn't go completely to the edge of the rotor and wore a small lip on the very outside edge of the rotor that has some rust. And the new brake pads are wider and rubbing that lip.

What's the best move here? Just let them grind and wear the lip down? Try to get different pads that are more like the old ones? Or should I be thinking new rotors.

Thanks.
This post was edited on 1/3/24 at 10:19 am
Posted by Warfox
B.R. Native (now in MA)
Member since Apr 2017
3142 posts
Posted on 1/3/24 at 10:12 am to
Rotors are so relatively cheap that I just throw new ones on every time I change my pads…
Posted by Northshore Aggie
Mandeville, LA
Member since Sep 2022
4655 posts
Posted on 1/3/24 at 10:13 am to
i usually just do pads and rotors together.
Posted by sta4ever
The Pit
Member since Aug 2014
15152 posts
Posted on 1/3/24 at 10:14 am to
I would start by doing it the correct way the first time.
Posted by BayouBengal51
Forest Hill, Louisiana
Member since Nov 2006
6535 posts
Posted on 1/3/24 at 10:14 am to
You will need to either get the rotors turned to have the lip machined down or put on new rotors. Getting them turned is probably the cheapest and easiest route for you. Also your pads are not flush due to being raised up on one end due to the lip. You will get better braking once the pads fit flush like they should on the rotor face.
This post was edited on 1/3/24 at 10:15 am
Posted by Classy Doge
Member since Nov 2021
2775 posts
Posted on 1/3/24 at 10:15 am to
Get the rotors turned down if the bedded section is still in spec as you should have done when changing the pads. Or replace rotors.
This post was edited on 1/3/24 at 10:17 am
Posted by NewIberiaHaircut
Lafayette
Member since May 2013
11553 posts
Posted on 1/3/24 at 10:16 am to
If your rotors have a lip they are due to be swapped.
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36035 posts
Posted on 1/3/24 at 10:19 am to
Thanks, new rotors it is.
Posted by ProbyOne
Louisiana
Member since Dec 2004
1914 posts
Posted on 1/3/24 at 10:22 am to
Your brake pads should match the old ones exactly

If your new pads are touching the lip of rotor then something is wrong with install or new pads

And also, rotors have a minimum thickness rating, so no you don’t have to replace if they are in spec
Posted by Cracker
in a box
Member since Nov 2009
17696 posts
Posted on 1/3/24 at 10:22 am to
replace the rotors the brake pads won't wear down that lip they will just eat your pads just go get a pair of rotors and if its a toyota, oem are cheaper online than crap you get at auto zone
Posted by EMAW2000
Member since Feb 2023
55 posts
Posted on 1/3/24 at 10:30 am to
You put the pads on backwards. Flip them around.
Posted by WHATASHAME
Louisiana
Member since Sep 2009
614 posts
Posted on 1/3/24 at 10:31 am to
They will wear in for free. Spend your money if you like.
Posted by Boudreaux35
BR
Member since Sep 2007
21449 posts
Posted on 1/3/24 at 10:34 am to
This may sound completely stupid, but check those pads. Make sure they aren't installed backward.
Posted by couyon2
Member since May 2019
74 posts
Posted on 1/3/24 at 10:43 am to
happened on wifes car recently. Evetime you would depress the brake after a redlight or if the car was in park it would grind and release a few seconds later. The parking brake apparently needed a fine adjustment.
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36035 posts
Posted on 1/3/24 at 10:54 am to
quote:

You put the pads on backwards. Flip them around.


Don't think so, I checked.

But I'll double check them.

I did engage the parking break which I haven't used in a while, so that might be involved.
Posted by TSS_Tiger
Baton Rouge
Member since Oct 2013
189 posts
Posted on 1/3/24 at 11:33 am to
Before you chase a lot of other parts… Double check the type of pads you got.

Some brake pads are designed to rub (even to the point of being able to smell them) because the heat up actually works to harden the ceramic and increase service life.
Posted by SRV
Banging in The Rock
Member since Nov 2021
1190 posts
Posted on 1/3/24 at 12:19 pm to
quote:

Your brake pads should match the old ones exactly If your new pads are touching the lip of rotor then something is wrong with install or new pads And also, rotors have a minimum thickness rating, so no you don’t have to replace if they are in spec


^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Posted by TigerFanatic99
South Bend, Indiana
Member since Jan 2007
27561 posts
Posted on 1/3/24 at 12:32 pm to
quote:

Rotors are so relatively cheap that I just throw new ones on every time I change my pads…


The rotors on my car are attached to the hub with a screw that is impossible to remove. I've tried everything amd can't get that bastard out.
Posted by keakar
Member since Jan 2017
30003 posts
Posted on 1/3/24 at 12:40 pm to
quote:

Rotors are so relatively cheap that I just throw new ones on every time I change my pads…



this ^^^^^^^

but to answer your question, do nothing, just drive it. after about 100 miles they will wear into the pads and stop making noise.

if it really bothers you that much you cant wait, then use side grinder to grind off and smooth out that lip
Posted by keakar
Member since Jan 2017
30003 posts
Posted on 1/3/24 at 12:44 pm to
quote:

Thanks, new rotors it is.


yes, and the reasons are 2 fold, 1 the new rotors have a rough surface that ensure better breaking, and 2 the new pads need that rough surface to wear in correctly. if not you can get squeaking brakes and other breaking issues
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