Master cylinder shot?

my 2009 150 hour KTM xcw 300 rear master cylinder doesn't hold pressure.

I can't see any leaks.

the rotor doesn't have a noticeable warp.

Pads good.

I just flushed and bleed the brakes both manually and with a hand pump vaccum bleeder.

The pedal still bottoms out.

Is the master cylinder shot?

Is this common on the KTM?

Check the o-ring/seal at the caliper

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