Doodle bug with predator engine and hotrod minibike hydrolic brake problem

#1
I put the brake on my minibike and as soon as I go and brake the pad slips out a little and stops the bike and the back wheel is locked.
 
#2
you might need to adjust a little with a set screw.might also want to ck gap is the same when you installed it on each side
or post some pics
 
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