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Brakes & Suspension Forum sponsored by The Tire Rack |
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05-04-2021, 12:12 PM | #1 |
Scooby Newbie
Member#: 36884
Join Date: May 2003
Chapter/Region:
South East
Location: Cary, NC
Vehicle:2019 Sti WR Blue |
Odd Pad Wear 2019 STi
2019 STI with only 16k miles. I started hearing a squeak from the brakes occasionally and noticed the pad on the front passenger side seems to be wearing unevenly, the inside, at the top is much thicker than the outside. I assume this will be under warranty and I've made an appointment, but wanted to get some insight before I go. I have not taken them apart at all, the retaining clips appear to be the same on both driver and passenger side. How is it possible to wear unevenly inside/outside? The car is stock, but did recently change the wheels to the S209 BBS's. The wheels only have maybe 600 miles, so I don't believe that to be related.
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05-04-2021, 01:26 PM | #2 | |
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Quote:
If you're seeing substantially different wear on the inner and outer pads, it's possible that the less-worn pad is somehow hung up (on the guide pins, or against the caliper body) and it's not being pushed onto the rotor face as firmly as the more-worn pad. |
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05-04-2021, 02:54 PM | #3 | |
Scooby Newbie
Member#: 36884
Join Date: May 2003
Chapter/Region:
South East
Location: Cary, NC
Vehicle:2019 Sti WR Blue |
Quote:
No, I'm being specific to just the outer pad in the photo. That's the view from above/front. It looks like the inside edge (hub side) has more material than the outside edge (Tire side). If you look at the backing and the pad wear, they aren't parallel, the wear appears to be wedge shaped. I've certainly seen pads wear as you are describing and even top to bottom if a piston were hung up, but these seem to be hub edge is thicker than wheel edge. I was able to get an appointment today, so I'm not going to bother taking it apart myself to see, I suppose it's possible I'm seeing things. |
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05-04-2021, 06:03 PM | #4 |
Scooby Newbie
Member#: 36884
Join Date: May 2003
Chapter/Region:
South East
Location: Cary, NC
Vehicle:2019 Sti WR Blue |
Must just be an optical illusion, or I'm an idiot. They said there was nothing wrong with them.
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05-04-2021, 08:47 PM | #5 |
Scooby Newbie
Member#: 489993
Join Date: Aug 2018
Chapter/Region:
NWIC
Location: PNW
Vehicle:2019 WRX STI LTD Pure Red |
Calm down, you are getting all excited over nothing. You are not an idiot, just uninformed about brake pads. What you are looking at there is called Chamfer and that's how brake pads come in, especially high performance brakes such as Brembo.
Go to the following sites or do a search online to learn more about what Chamfer is: https://www.brakeandfrontend.com/bra...revent%20noise. https://www.wagnerbrake.com/technica.../chamfers.html |
05-05-2021, 07:09 AM | #6 |
Scooby Specialist
Member#: 498642
Join Date: Mar 2019
Chapter/Region:
Tri-State
Location: our wrx IS the family sedan
Vehicle:'19 WRX Ltd 6M dgm '08 Mustang GT (the toy) |
Not sure about that being a chamfer - that'd be a leading edge/trailing edge detail, and for that I'd expect the friction material thickness relative to the backing plate thickness to be constant going radially outward. The chamfer angle would show up along the inside surface down near the rotor hat.
I'd pull the pads on that corner to see what the full wear pattern looks like. xothermic - what does the pad on the other front brake look like? Similarly worn? Norm Last edited by Norm Peterson; 05-05-2021 at 07:25 AM. |
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