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Old 05-17-2018, 04:45 PM
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Do I need to replace brake rotors?

I have a 2011 X5 with 20K miles and original brakes, front pads are now worn and need to be replaced. I'm switching to Akebono pads, can I reuse the rotors that appear to be in good condition? Will they make noise or cause other issues? Can I just change the pads and see what happens and change rotors later if needed? I don't like to replace parts unless worn. Thanks
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Old 05-17-2018, 07:11 PM
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The technically correct answer: You should either have your rotors resurfaced (if they still are thick enough, which they should be at only 20k miles), or replace them with new ones.

Practical answer: If they do not have much wear on them, and they are not warped (no pulsing of the brake pedal when brakes are applied), then you could just scuff the existing rotors with 80-120 grit sandpaper to knock the glaze off of them, and replace just the brake pads. The new brake pads need to wear in with the rotors, and they can't do that on a smooth glazed surface. I did all 4 corners of my 2012 like this (also with Akebono ceramic pads), and they work fine afterwards.
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Old 05-17-2018, 11:52 PM
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Perfect! That's what I'll do, thank you!
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Old 05-18-2018, 01:34 AM
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Eh, IMO you dont need to resurface them. Ive just slapped new pads on existing rotors without issue for years.

HOWEVER, you should measure them. A visual tells you nothing.

There is a minimum rotor thickness, it should be stamped on the edge of the rotor. Oh, I too agree that with only 20k miles on them, they should be good....
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Old 05-18-2018, 07:20 AM
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As stated above, just measure. For reference, mine were below spec at 35k miles on a 7 year old E70. My father can get 100k out of rotors on his which sees 20+k miles per year on the highway.
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Old 05-18-2018, 02:25 PM
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Quote:
Originally Posted by ard View Post
Eh, IMO you dont need to resurface them. Ive just slapped new pads on existing rotors without issue for years.

HOWEVER, you should measure them. A visual tells you nothing.

There is a minimum rotor thickness, it should be stamped on the edge of the rotor. Oh, I too agree that with only 20k miles on them, they should be good....

Thats what I do, clean up everything with brake clean, check the rotor for spec and put it all back together. Never had any issues.
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Old 05-20-2018, 06:52 PM
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As others have posted…
After confirming the rotors are above minimum thickness, and cleaning everything with brake clean, I just install the new pads. BUT…

if the rotors have a lip, I break in the new pads over the next 50ish miles by braking longer but more gently. This wears the edges off of the pads (where they touch the lip) so that they get full contact with the rotor. This probably doesn’t take 50 miles, but that’s how far it is into town

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