Typically, it's either shocks or struts, depending on which your car has. Shocks/struts absorb the resonance energy of springs. The PURPOSE of the shock/strut is to stop the wheel from bouncing when you hit a bump. Without the shocks, the wheel would continue to bounce, sort of like a Basketball. When the shocks work properly the wheel is "dampened", keeping the tire in contact with the road and giving better control. The bonus is, the car doesn't bounce, the way you're describing. The good news is, they're not terribly expensive and they're usually not impossible for the DIY'er. But if you prefer, it's not terribly expensive, as auto repairs go. If you have someone do the shocks, have them check other suspension components at the same time. No point in replacing just the shocks if the whole front end is worn out.
Possibly a bad wheel bearing.
try new tires and a front end aiighnment.
You are driving over the 'cats eyes' marking the lane boundries.
check your your front and back diff also check upper end of coil springs on front struts
Fix it before you drive again-can be multi causes but is very unsafe
Worn steering parts, worn suspension parts, tires out of balance, out of alignment,
if you are driving and you go to stop, then that means that the front rotors are warped. if the front rotors are bad, you will feel a pulsation in pedal while applying brakes. change rotors on front.
You need to look for the obvious from underneath while someone is bouncing the cars bumper. If no luck, one area to look at is the front brake pad anti- rattle clips; possible missing or broken. Good luck.
rises slowly
i have a 93 nissan and the front brakes are getting hot when driving
If it sounds like it's from one of the front wheels, you may have a worn out CV joint.
A cold front