Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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There is a small screw at the base of each of your brake's arms. Tightening that screw should make the arm move outward.
Honestly, if it was my bike I'd buy a set of lower end Shimano brake arms and ditch the ProMax. You'll only have to do that once. Keep the ProMax and you'll be jacking with them constantly.