usual thing that causes bouncy ride at normal ride hight is some or all of the spheres have lost there nitrogen(gas),i buy all of my spheres for mine and my customers cars from GSF (not the recon one)just the new AMTEC ones,GSF usualy know what they are talking about,also to check hydraulic fluid level put car up on its highest setting on level ground,wait for it to settle and with engine still running the yellow disc at the top of the float is the level indicater(not the gold one),which is ment to be between the two red bands on the clear plastic dome,the gold (copper)disc just conects thecontacts in the bottom of the dome when the fluid is to low to put the warning lamp on regards malcolm