
easy... fit the rotors
next fit the lever to the bars
leave the yellow spacer in untill you have fitted the caliper to the frame or fork and tighten these up.
then slacken the 2 bolts that hold the caliper to the adaptor (not the frame bolts) then pull the spacer out...
put the wheel in (make sure its properly in the drop out.
next pump the brake up once firm hold the lever tighthly in to the bars and tighten the 2 bolts back up this should have centered the caliper over the rotor
visually check that there is equal room between the rotor and the caliper on each side
for Maguras to get good pad life you need to bed te pads in..
so arm yourself with a bottle of clean water soak the pads (pour it over the caliper find a hill and drag it all the way to the bottom followed by 10 hard stops from 20 mph ish
job done ;0)