I am sure this was due to my own ignorance on proper technique, but immediately after landing in a Cessna 172, I applied brakes and some moderate aerodynamic braking and experienced an awful and violent rapid shake of the plane. I let off the brakes but the plane continued to shake for a few seconds.
This caught me off guard and certainly had my anxiety pretty high given I've never experienced this before. I cannot recall at the moment what I did to get the shaking to stop. I believe I simply let off the brakes and tried to steer the plane with the rudder. Again, this took a while (which felt like an eternity and had me wondering if I was going to lose control of the aircraft).
Once the shaking stopped, I tried to just lightly touch the brakes. The shaking started immediately again.
At this point I was very conscious about making sure I was using the most aerodynamic braking as possible and simply trying to steer the plane down the runway with no brakes.
What causes this? Are all Cessna 172s like this? I was advised when talking with a CFI to essentially not use the brakes until I've slowed down significantly.
For background, I'm used to flying the 4 seater Pipers (140, 160, 180, 200) and am transitioning to fly the 172's because my rental location no longer owns Pipers. I have never had this problem with a Piper. I could land, apply maximum aerodynamic braking and a good amount of toe brakes without issue (and optionally continually increasing the braking as the plane slowed more).
If I were to guess, I imagine this is due to the Pipers landing gear being short and stubby whereas the Cessna's gear is much longer and thus probably has more bend in the gear as well as torque it can impart on the aircraft.
The nose wheel was on the ground. Sounds like a lot of you are thinking its nose wheel shimmy. I'm inclined to think you're right, but I'm surprised at the intensity of it because it was LOUD and things in the plane were shaking pretty significantly.