Warped Rotor?

[David Flori]

This is for a Ven04 system with floating single plate disk.

So I read here that they are OK even “preferred” to be slightly warped, to help spread the pads, but what is an acceptable amount of warpage?

The one I have seems like it is a bit too much.

With brand new unseated pads in, it seems to scrap enough to make a “wop wop” sound once per revolution, when free spun.

Putting a strait edge on the disk seems to give cause for pause...

But I really have no point of reference.
What is acceptable, and is there any sense in straitening it?


While on the topic, what is an acceptable amount of play in the floating system between the disk and brake hub, as well as the retaining disks that allow the floating system to float?


What are acceptable procedures or methods to check the tolerances?

[JIM SILVERHEELS]

Would a suface grinder at a machine shop take care of the warpage?
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Don't get stuck in someone else's discarded chewing gum with your thought process.

[David Flori]

That would be debatable, I am sure.

I would not attempt that simply because the disk has a distinct “S” shape, where if the disk were to be ground untouched, the top seems to lean one way while the bottom the opposite way.


I am not sure if it was caused by a odd heat cycle, and perhaps localized cooling. The breaks have been under a lot of very taxing heat cycles and stress.

Or if perhaps this is typically seen on these types of disks.

Or even if improper procedure to cool the brakes are being used.
Typically take a single cool down lap.

Or if it is simply damage, and or another cause people here have learned about.

[Bill Martin]

[David Flori]

Thats kinda what my concern would be also with grinding.

Wondering if it is advisable to put a little pressure on the high points and push the rotor back to where it belongs via the press very gingerly?

While not ideal, I dont believe those to be too brittle as they are not cast, and I think they would take a little force to move them back where they belong?

Has anyone attempted to straiten the ven04 disks, or is it a replacement only?

They seem to have a very even/good surface wear to them, no slots, waves or uneven wear marks.

[Bill Martin]

Are you measuring with the rotor still attached to the hub? Sometimes the Al. hub gets bent too, so be sure to check it separately if you haven't done that already. i have never been able to get back to "new" straightness with crude techniques, but if not a cast iron rotor, it can be bent back a little bit with just a big crescent wrench, clamping the opposite side in a solid vise. If really in a hurry, like trackside, hit it with a big rubber hammer!

bill
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Bill Martin

[David Flori]

Yes just looking at it while attached to the brake hub ATM, and in use.

I have spanned the disk with a strait edge, and it is definitely slightly bent, as different rotated positions give different readings.

AFAICT the hub looks fine.

Replaced the brake pads, and noticed it had a pronounced wobble to it, and am simply requesting advice as to what should be done.


I think it wouldn't take much to bend it back strait with my press,and as far as my logic would dictate it should be easily doable considering the material and configuration, but I am not sure being as the item is a brake component, (considered my single most important component) whether it should be treated in this manor, or replaced from experience?

IIRC the disk should be right around $180-200, not the end of the world, but if it can be fixed, I wouldn't mind having a go if there is no conceivable danger with doing so.

I guess just looking for a little reassurance that I am not cocking it up, and that it should be safe from experience dealing with this exact specific component?