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Old 02-28-2009, 02:40 AM
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MINIR53 MINIR53 is offline
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Default Uneven Brake Pad Wear

Ok, here's a question for some of you experienced mechanical types....

I replaced my pads and rotors at all four corners about 5000 miles ago with Hawk HPS pads and Power Slot slotted rotors. I was visually inspecting them today (without taking the wheels off) and noticed that all the outer pads (haven't checked the inner pads yet) at all four corners are wearing unevenly. They look to be either wearing at an angle or concave.

Do any of you have any idea what might be causing this? It seems odd that it's happening at all four. Thanks in advance!

Chris
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Old 02-28-2009, 02:51 AM
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The angle is likely a combination of it being a sliding caliper design coupled with the relatively soft stock caliper bushings. The soft bushings let the caliper wiggle itself into different angles instead of the desired perpendicular slide of the design. You can remedy this by going with some solid bushings like Tyrolsports, but you'll have to make sure they stay lubricated, something you don't have to think about with the soft stock ones. It's more just a wear thing than a performance thing really, so if it doesn't bother you that you get a little less wear because of it, I wouldn't worry about it too much. The squishiness of the stock bushings do have another effect in that they make your pedal feel a squishier, since the calipers have to take up slack in the bushing when you step on the pedal before they start to transfer braking force.

Squishy OEM-style bushings:
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Tyrolsport-style bushings:
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As far as all four wearing unevenly goes, that could be the calipers sticking a bit, or it could be a side-effect of the brakeforce distribution or corner brakeforce control systems, since they brake unevenly both front-to-rear and left-to-right, depending on the situation.
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Old 02-28-2009, 03:56 AM
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My rear calipers do this. I have a set of the TyrolSports to install next time. The R53 JCW fronts don't have the squishy bushings so they seem to do pretty well.
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Old 02-28-2009, 05:58 AM
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Thanks guys, I guess it's worth a try. This is my fourth set of pads on the car and the first time this as happened. Still stops good!
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Old 03-01-2009, 05:38 AM
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Could be squishy bushing, but it also could be a sticking caliper slide.
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