Driving comfort for riders and passengers is a key target to be achieved. Fluctuations in vehicle loads, bumps,
perforated surfaces, and other road damage will greatly affect the vehicle suspension working system. This study aims to
(1)examine more about the effect of vertical dynamic load of vehicles and changes in dimensional barriers on the road
surface in its path.(2) obtain the amount of vibration and load reduced by the working of the spring and shock absorber.
Load changes arising from the number of non-permanent passengers always burden the vehicle suspension in a fluctuating
manner. Experimentally these load fluctuations are replaced by pneumatic actuator forces of varying magnitude based on
the regulatory pressure of the regulator. The deviations generated by the varying load work are measured by placing a
proximity sensor along the spring movement. The vertical dynamic load transformation up to the road surface is measured
using a "Load cell" mounted under the wheels of the vehicle. Characteristics of vertical dynamic vibration occurring due to
several dimensional barriers, U (cm) obtained using mathematical modeling method with 2 DOF suspension system
transfer function. The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14
seconds with a deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d =
1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is
only duration t = 0.22 s, because of the reaction of the spring and a shock absorber that can dampen the vibration not less
than 25% to the vibration caused by the vertical load of the body and the axle of the vehicle.
Keywords: vibration, spring, shock absorber, deviation, vertical load.