are BRAKING! LIST CAR TYPE and TRANS TYPE here! FRONT drive, REAR drive? BOTH?? engine size and country of origin as well! You can test your OWN tie rods easily by having a pal JIGGLE the steering wheel! Put your hand on the TOP of your tire and "FEEL" for LOOSENESS< or even a CLICKING feeling! TIRES should jiggle EXACTLY THE SAME as the steering wheel does! NO PLAY! ANY TIRE SHOP can tell you about this! Tie rod ends are VERY CHEAP at about $20 or so for each one! INNER TIE RODS are more expensive as it takes MORE TIME to install them! GOOD LUCK!!
Its either wheel balance problem or warped brake discs.
You have warped rotors. Nothing serious but annoying none the less. Warped rotors happen from overheated brakes caused by either poor quality parts or braking too hard and long. Easy fix, just take them off and take them to a parts store. Most do it for about 15 a rotor as long as they are still thick enough a to cut safely. If they are too thin then you need to get new ones. Also check your pads if they are low. To see if the fronts or rears are warped just see if the steering wheel shakes when you brake. If it does then fronts are warped if you feel it more in you seat or pedal then its the rears.
Why are you driving so fast for? This is a terrible waste of fuel and very dangerous. And you do this knowing about this mechanical problem you ask here? The driver of this destroyed Corvette also went fast and he also "knew" how to drive. Now, he does not. Next in the logic department. Cars are repaired and serviced by mechanics. What do you expect to accomplish be asking here? So, if the car is behaving as you indicate when the brakes are applied, would not that be a positive indication that there is something wrong with the brakes? If there was something wrong with the tires, would not the shaking be 100% of the time? That is two counts of logical thinking against you. I wonder what shall be the next. I hope you do not end up with an obituary in the local paper.
the rotors are either warped or unparalleled. either way, it is time for a good brake inspection. a slim chance of a loaded misfire but that is slim, as i said.
You have warped brake rotors and may have bad front end bushings/tie rod ends/ball joints that make it even worse/amplify the shake.
something can be bad with your engine or fuel supply system
Sometimes when I'm on the interstate and I'm going like 80 and I start to brake my car shakes. Why is that? Is it something with the tires?