is it is or pm And xt brake question

Hi i bought a ibis mojo sl but the rear rotor is hugh making it lock up all the time so i want to change it but i dont no what mount i need ie is or pm. Also the brakes are xt and is the lever cover (the bit you remove to add fluid) the size as xtr brakes thanks.
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Posts
Don't know what you're asking.
Frames are generally IS.
That explains the type of mounts.
From a quick Google search, I'm pretty sure the lever caps are not the same.
http://www.bikeradar.com/forum/viewtopic.php?t=1590919
Parktools :?:SheldonBrown
need more info pal.