How to Adjust a Hydraulic Brake Caliper on a Bicycle By ahtopahtel in OutsideBikes6048Introduction: How to Adjust a Hydraulic Brake Caliper on a BicycleBy ahtopahtelFollowMore by the author:When removing front or rear wheels, sometimes the caliper gets misaligned and needs a quick reset.Usually the bolts are either 4 or 5mm hex-key.