The handbrake is adjusted by moving the 2 nuts on the threaded part of the handbrake cable, iether side of the retaining bracket, on the rear suspension. Extend the cable outer to make the handbrake 'tighter', shorten the cable outer to make the hand-btake 'looser' Both sides should be adjusted equally. Ther is also the chance that either the handbrake is overtightened on one side, or is 'hanging-on' because it is slightly siezed. Check ALL your linkage and make sure it is all moving freely.