In this study, the effects of hard damper setting on ABS braking performance have been experimentally investigated by taking brake pressure changes as a reference. For this aim, ABS tests have been conducted under wet and slippery rough road conditions by using medium-hard and hard dampers. In order to assess the test results, three braking maneuvers are considered. Test results show that hard damper setting improves ABS-braking performance under slippery road condition, while it deteriorates with wet road condition because of brake pressure oscillations occurring in vehicle body, axle and brake pressure pumping resonances. For this reason, the hard setting causes the bad braking performance during transition from slippery to wet road conditions.