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Front Brake rotor question?

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Old Aug 30, 2010 | 12:41 PM
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Clams Canino's Avatar
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Default Front Brake rotor question?

Which one is factory - if either?

1. Both have been there since at least the late 70's.
2. Both had all the rivets in place when I took tthem apart last month.
3. Both are in real good shape - sandblast and go shape.

One rotor is marked: "MIN. THICK 1.215
The other is marked with just a "K"

-W
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Old Aug 30, 2010 | 01:03 PM
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From: Massapequa Park NY
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Originally Posted by Clams Canino
Which one is factory - if either?

1. Both have been there since at least the late 70's.
2. Both had all the rivets in place when I took tthem apart last month.
3. Both are in real good shape - sandblast and go shape.

One rotor is marked: "MIN. THICK 1.215
The other is marked with just a "K"

-W

Both of my originals are marked "MIN. THICK 1.215"

Jim
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Old Aug 30, 2010 | 01:06 PM
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Either/both/neither could be original. GM sold pre-assembled hubs and rotors over the counter for many years .
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Old Aug 30, 2010 | 01:13 PM
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Originally Posted by Mike Ward
Either/both/neither could be original. GM sold pre-assembled hubs and rotors over the counter for many years .
yep. BTW why would you be blasting a rotor?
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Old Aug 30, 2010 | 02:00 PM
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Originally Posted by SanDiegoPaul
yep. BTW why would you be blasting a rotor?
To break the glaze without altering the run-out, like turning it would - of course.
(You also mark the hub position so as to return them to the same orientaion on thier hubs.)

You blast it to de-glaze it. And then you take a wire brush wheel (or sandpaper) to the platters to kill the blast roughness. The end result is a pretty near perfect rotor surface - ready to break in with new pads.

-W

Last edited by Clams Canino; Aug 30, 2010 at 04:42 PM.
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Old Aug 30, 2010 | 02:03 PM
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From: Anderson SC
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Originally Posted by Mike Ward
Either/both/neither could be original. GM sold pre-assembled hubs and rotors over the counter for many years .
That does kinda seem like the logical way to sell them if you think about it.
Oh well.... I was just curious.

Both of them are near perfect and easily on my re-use list.

-W
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