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Old 02-27-12, 08:23 PM   #1
chrisd0729
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Rear rotors /reinstall and rivets

I'm replacing rear calipers and pads on a '72 and was planning to cut the rotors while I have it apart. A few questions on the rotors and rivets:
1) Is it worth pulling the rotors and cutting them if they look clean?
2) What are the rivets for and do I need to bolt or rivet the rotors back on when reinstalling?
3) If I do pull the rotors, what's the best way to remove the rivets? I assume drilling them all out?

Thanks in advance,

Last edited by chrisd0729; 02-27-12 at 08:49 PM.
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Old 02-27-12, 09:17 PM   #2
thoyer
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Quote:
Originally Posted by chrisd0729 View Post
I'm replacing rear calipers and pads on a '72 and was planning to cut the rotors while I have it apart. A few questions on the rotors and rivets:
1) Is it worth pulling the rotors and cutting them if they look clean?
2) What are the rivets for and do I need to bolt or rivet the rotors back on when reinstalling?
3) If I do pull the rotors, what's the best way to remove the rivets? I assume drilling them all out?

Thanks in advance,
Chris,

If the rotors look good I would check them for run out. If the run out checks good, then leave them alone.

If you have to pull the rotors, you'll have to drill out the rivets. this can be time consuming so make sure you have some sharp bits.

Once you have the rotors cut and you don't plan on riveting them back on, bolt them onto the hub using the lug nuts upside down and check the rotor run out. I like to shoot for less then 0.002" of run out, the service manual says 0.005". Keep in mind that the rotors were riveted on so the rotor stays firmly in place when the wheel is removed. This guarantees the runout doesn't change. Even with my lug nut method, once you loosen them and install the wheel, you may not have the same runout you measured. Excessive runout causes the caliper pistons to pulse leading to air getting into the system. You use shims between the rotor and hub to adjust the runout. Also keep in mind that bearing play can come into effect when making these measurements. The runout is over and above any bearing play.

There are several articles on the internet on this subject. A google search may be in order.

Also if you do remove them, make sure you align the emergency brake adjustment hole on the hub with the rotor.

Good luck!

Tom
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Last edited by thoyer; 02-27-12 at 09:35 PM.
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Old 02-28-12, 06:49 AM   #3
Dennis Trayes
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If you do drill the rivets out, put a paint spot on the rotor and hub to get them back on in the same position
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Old 02-28-12, 11:18 AM   #4
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Right on Dennis, I was just going to add that.
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