Q: Cars shakes, like driving over invisible potholes

The vibration in the steering wheel is due to dynamic imbalance, excess radial force variation in the tires and/or faults (looseness) in the suspension that permits the residual imbalances that are normally held in check by a tight suspension to be transmitted through the vehicle. Wheel/tire assemblies balanced at stores are not perfectly balanced. There is always a residual imbalance but such is usually imperceptible to the driver and occupants so long as the wheel is held rigidly along the spinning axis by the suspension. The vibration on braking could be due to warped rotors and/or rotor defects such as hard spots and thickness variation. The cyclical wheel tramp could be due to a tread separation, imbalance, or flat spot on the tire which type of tire damage in turn is usually due to a failed shock or strut. To resolve all of these issues, the front end should thoroughly inspected and if the tires are old they may need to be replaced as part of the diagnostic. If the rotors are warped, those would have to be replaced as well. Please let us know how we can best assist you.