Who can check disc warpage?

[Starky307]

how would you measure it?

Use one of these.

They have a magnetic base so it gets stuck to a reference datum point that won't move. Set the arms so the dial gauge pointer is on the rotor and slowly turn the wheel. If the rotor is true and straight then the needle won't move, if its bent then the needle will swing back and forth.

I've got one if you wanna come for a ride out to Pukekohe some time, also got a set of bike stands that lift the front by the bottom steering head mount.

[FJRider]

Use one of these.

They have a magnetic base so it gets stuck to a reference datum point that won't move. Set the arms so the dial gauge pointer is on the rotor and slowly turn the wheel. If the rotor is true and straight then the needle won't move, if its bent then the needle will swing back and forth.

I've got one if you wanna come for a ride out to Pukekohe some time, also got a set of bike stands that lift the front by the bottom steering head mount.

Often the amount of warp is hard to see with the naked eye. One of the above quoted instruments will tell you how bad the warp is.
Some can be trued by competent engineers with a lathe. Not a job to be taken lightly. But the downside is... usually this operation brings the disc thickness below the reccomended margin.

[The Stranger:Me]

how would you measure it?

As per SPB's post. I think sixpack is closer to you however.

[mulletman]

Maybe the caliper and pads need a clean up ?? Could be a build up of dirt and dust making them shudder,

[FJRider]

Maybe the caliper and pads need a clean up ?? Could be a build up of dirt and dust making them shudder,

The surfaces are .. ummmm ... self cleaning , when brakes are applied.