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Rotor Thickness

2373 Views 8 Replies 6 Participants Last post by  Beoweolf
Anyone know the min. allowable thickness for 65 Mustang w/ front disc brakes. Can't see to find info in the books. Shop manual only list .810 it does not say if that's a new or min. #. i mic'd mine and they are both about .760 thick. Is this enough to have them turned? Any help would be great. I looked all over the rotor's themselves and can not find any markings as to thickness.
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I would say that .810 is discard if that is the only spec. Why would they list the nominal thickness?
Check with a parts store or brake shop. They can give you the min specs.
OR that is the machine to thickness - the minimum thickness you can machine it to.
First off, I don't remember the exact number.
But I will tell you that even brand new out of the
box, the 65/66 rotors were very close to the
discard spec. If there is any time on the rotors
at all, they are below the minimum. Century
was one of the OE rotor suppliers and they
were always that way. Back when I was doing
brake jobs for a living, this was one of the things
we used to joke about behind the counter - do
the pads twice and it was time for new rotors.
I looked in my vintage Chiltons manual yesterday while out in the garage. It only listed drum brakes.
I have been following this thread, but can't understand where the issue comes in?

Am I missing something here? Every factory (Ford OEM) disc/rotor I have seen has had the acceptable thickness and nominal (discard) thickness cast in the area near the inside edge, between the swept area and the hub. Is this a strange application, someone installed some bargin basement copies or is this a case of trying to get the cheapest solution possible? You can grind them thinner, but it isn't safe and no business will (or at least should not) take the chance of breaking the law just to save a few pennies. If it's that close, buy new rotors...they don't cost that much!

<font size=-1>[ This Message was edited by: Beoweolf on 3/27/06 10:44pm ]</font>
Bepweolf as I stated in orignial post there are no markings that tell the thickness on the rotor's themselves. I by no knows am trying to be cheap as I plan to carry small children in vehicle when job is done. All i was trying to do is determine if the rotor's could be turned or needed replacing. I have since learned that they were to thin and have bought replacements. It's all ways better to make a informed decision than just go out and blow money if not's not needed. Thanks!!

I did read your message, I saw the part where you said you couldn't find the point was to indicate where they should or could be found, that wasn't clear, at least not to me. My last point was based on experience, expensive experience - when in doubt, especially when it comes to safety - replace it.

The good thing is you made a decision that resolved everything to your satisfaction, can't be a better solution than that.
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