My 98 xplorer has one, there should be a bolt with a jam nut on it, loosen the jam nut, turn the bolt in (both need 7/16" wrenches) till you have a good pedal, then tighten the jam nut. I believe there is even a spec for it, not sure what it is though, just make sure the brake doesn't drag.
I am here: http://maps.google.com/maps?ll=43.092705,-75.706301
Mine- 2011 Sportsman X2 550 With EPS!!-Warn 2500lb Winch, Guru Brush Guard, RZR H13 bulb headlights, KC LED Yellow tint Driving Lights, Rigid light bar mounted in the pod, Autometer Phantom Oil Temperature, Coolant Temperature, and Voltmeter Gauges, Polaris Low Lock and Ride windshield, Acerbis Handguards, Symtec Heated Grips and Thumb warmer, 2+2 gallon Rotopax Fuel packs, STI HD Beadlock wheels and 27" GBC Spartacus Tires
Hers- 2012 Sportsman 550XP EPS Blue Fire LE 27" ITP Mudlites on ITP SS212 Wheels, LED headlights, Mile Marker 2500 lb winch, Polaris bodyguards