gs550t front brake rotor warped

[Nessism]

I still haven't come up with a dial indicator, but I did measure the thickness of the disk with my dial caliper. The spread of the measurements was .006 inch. Does that mean anything?

Yea, that means something...your disc is junk.

Keep in mind that using calipers is not the most accurate method to measure something like a disc. In fact, .006" of thickness variation is huge - you may have some unexpected measuring error.

[Nessism]

Just pulled out a spare 550 rotor and measured runout - .004" max. This is the older style rotor without the slots but it should fit on your T model - you can have it for $5 + shipping costs. Send me PM if interested.

[Fishman]

Thanks, PM sent!

[Fishman]

The new rotor fixed the problem as Nessism predicted. It was a 6mm thick rotor, whereas the factory spec was a 5.5mm, but no problem. Maybe the extra thickness will reduce warpage

[Nessism]

The new rotor fixed the problem as Nessism predicted. It was a 6mm thick rotor, whereas the factory spec was a 5.5mm, but no problem. Maybe the extra thickness will reduce warpage

Great news. I'm glad it all worked out!

[Fishman]

One thing I forgot to mention, I checked the thickness of the good rotor with my caliper and it was within .003". So, while measuring thickness is crude and doesn't tell you flip about warpage, the two bad rotors were both identifiable using this method.