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Old 04-28-2011, 09:07 AM   #1 (permalink)
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Doobie03
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Brake Rotors, Replace or Resurface & TOLERANCE ? -- hi - Son has a 2006 Sonata GLX, 6 cyl. Has some pretty minor pulsating when braking at 70-ish (which is rare. He does not drive that fast, I just did it for testing). Otherwise he is getting what I call normal squealing noise as the front pads need to be replaced, rears are close enough to replace since it will be up on the rack anyway.... car was bought used at 47k miles has 100k on it now. Normal driving conditions.

The mechanic just said replace rotors (and probably calipers) without even looking. They quoted $325 front and $350 rear - without calipers. They said can't resurface OEM rotors as they are not thick enough. (I told him to find a new mechanic).

QUESTIONS:

Can the original rotors be resurfaced? They appear fine, very minor pitting some minor track worn in the fronts only.

What is the tolerance for thickness? I cannot find that info tidbit anywhere! I can measure them, but need the minimum thickness tolerance per Hyundai specs.

What is difference in cost to have the rotor resurfaced vs. replacement. Back in the days I worked at Ford dealerships, they just set the rotors on lathe and walked away to get ahead of the book job labor hours.

Thanks.
dd
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Old 04-28-2011, 09:38 AM   #2 (permalink)
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Front rotor/Rear rotor - 28 mm/10 mm - standard thickness --- 26.4 mm/8.4 mm - minimum thickness

At 100,000 miles you are probably better off replacing them. If they are already warped and you have them machined they will be even more likely to warp afterwards. Decent aftermarket rotors are not that expensive for the Sonata.
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Old 04-28-2011, 09:48 AM   #3 (permalink)
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TYVM
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Old 04-28-2011, 01:14 PM   #4 (permalink)
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I had the pulsation start at 60k. It will get worse as time goes on.

If you re-surface, the pulsation will go away temporarily and come back in ~10k.

I replaced all rotors/pads with Centric premium parts for $690 including brake fluid flush at an independent wheel shop (in Natick) at 70k.

Re-surfacing would have saved me maybe $300+, but is a waste imho. You'll end up doing it again and again until you eventually replace the rotors.

All is well ever since I got new pads/rotors!
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Old 04-28-2011, 03:21 PM   #5 (permalink)
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this is a no-brainer.
Replace rotors
there are millions of aftermarket rotors and pads with oem specs out there that will outperforms the originals by miles.


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Old 04-28-2011, 06:10 PM   #6 (permalink)
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I got 120K+ from my originals until they started making scary, grinding noises so I never had the option of turning them. My experience on the Fords was that turning saves a little but only lasts a while. Replace.
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Old 04-29-2011, 06:56 AM   #7 (permalink)
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I replaced pads @ about 60K on all wheels with generic aftermarket pads for about $40. Rotors only had minor noticeable wear at the time. Will replace rotors with next pad replacement. REARS run about $35, FRONTS run around $65. Very easy brakes to service.
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