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Minimum Rotor Thickness

 
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Old 15 Oct 2010, 12:57 pm
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Default Minimum Rotor Thickness

Can anyone tell me what the minimum rotor thickness is for a 2005 Classic? I've looked at the rotors on both sides and can't find anything stamped in them. These are original rotors with 75K miles on them and they're starting to develop a noticeable lip around the edges. I've measured them at 22.41 mm left side and 22.64mm right side. The drums in the back are still legible as far as minimum thickness, so I'll measure those as well since I believe they are also original equipment.
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Old 15 Oct 2010, 03:45 pm
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Default Re: Minimum Rotor Thickness

You'll have more wear on the front as they do 80+% of the stopping of your PT.
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Old 15 Oct 2010, 04:28 pm
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Default Re: Minimum Rotor Thickness

dont knwo what the specs are However you can turn them 1 time maybe 2 if they are not warped really bad and are still in the "SAFE" zone

to be honest as cheap as a new set of rotors are I might turn them once and then replace them the next time

(The original replacments are inder $35 at NAPA I am sure you can get drilled and slotted that are way more
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Old 16 Oct 2010, 08:50 am
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Default Re: Minimum Rotor Thickness

Seriously? With all the expertise on this forum, someone has to know minimum thickness. Oh, and I did measure the back. They're at 227.8mm and maximum diameter is 230.6. Looks like its time to replace those.
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Old 16 Oct 2010, 09:04 am
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Default Re: Minimum Rotor Thickness

From PT Do-It-Yourself.net

With the OE rotors there are two different sizes available dependent on brake application. Vehicles with the brake sales code BRB (Disc/Drum combination) and BRT (Disc/Disc combination) use standard size brake rotors. Vehicles equipped with the brake sales code BR4 (Performance Disc/Disc combination) use heavier brake rotors.

BRB minimum rotor thickness after turning: 21.40mm or 0.843” (you have 22.4 and 22.6)

BR4 minimum rotor thickness after turning: 26.40mm or 1.039”

In your first post: It looks like they are still good.

In your last post you said you have 227.8mm. That equates to 8.97 inches. Why are you measuring the diameter of the rotors ?? Am I missing something. Do the rotors get smaller as they wear out....don't think so.

Last edited by CREWZIN; 16 Oct 2010 at 09:18 am.
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Old 16 Oct 2010, 04:13 pm
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Default Re: Minimum Rotor Thickness

I wasn't measuring the diameter of the rotors, but the diameter of the drums in the back. They appear to be below minimum spec, but only by 3mm, so I'll probably wait to replace them till I need to replace the front rotors.
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