My car shimmies upon braking from high speeds

Warped rotors usually causes this due to excessive braking. Could be bad belt in tire also, or possibly a bent or cracked rim.

how old are your tires and do they match and at recommended pressure? does it pull to one side or just shake/shimmy?

Hi,
from your description I would list these possibles.
One or both front brake disc's / rotors are warped.
One or both front brake disc's are badly scored

If the fault, as you described it only happens when braking from a "high" speed, I would check the above.

Front end shimmy under "normal" driving can be caused by numerous faults in addition to those I stated above. However, I am using your definition as a scenario.

Good luck.

most common problem is warped discs/rotors.change them as a pair with new pads....could also be....worn hub bearings,rubber bushing,track rod ends,car needs to be put on a ramp and inspected for these faults.

This sounds like tie rod ends are going out. Before you remove the old ones, mark on the threads where it currently is seated or you will throw it out of alingment when you put new ones on. You may need to borrow or buy the tool for poping out the tie rod end. They aren't a big deal to change if you have some basic tools and sometimes you don't need the wedge tool either. Once you get the old one out, try moving it around. If it is real loose and moves easily, thats your problem. But the swaying you are describing sound like this is the problem. Could be you steering control arms as well but because the inside of the tires are worn I doubt it.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/matthew_d24b835e574ef6ca

If it shimmies with the brakes applied, it's a rotor problem....but like you say, it shimmies just at a certain speed with no brakes applied, check tires for out-of-roundness. If they look ok, you are looking at a balance problem with the tires.

have u had your shokes check

Usually if u can drive into and out of a shimmy it is tire problems, usually balance. It can happen at diffenent speeds. The "shimmy" is the tires bouncing.

In absence of more information, this is usually an symptom of warped brake rotors. A rotor can build up enough heat in a hard stop to be bendable especially with the high hydrolic pressure a brake pad can bring to bear. Simply, If you keep the brake pedal depressed hard after a hard/long stop it can warp the rotor. (NOTE: at a hard stop, as soon as possible let the car creep forward a few inches at a time so the brake pad won't be on any one spot too long, plus keep light brake pressure --only enough to keep the car from rolling). The warped rotor causes the brake pad and caliper to float too far from the rotor and you won't feel the shimmy until you apply brakes. Under brake pedal pressure each time the wheel rotates under brake pressure the rotor and caliper will rapidly vibrate a few millimeters to each side giving the sensation of a shimmy in the sterring wheel. Most of the time this can be corrected by having the rotors resurfaced( aka Turned)

Out of balance or out of round tires can also cause a shimmy but should occur at a given speed range. Warpped rotor shimmy occurs during deceleration.

Balance your wheels at a good shop. Have the tires checked for out of round/side wear. Are there any sidewall bubbles?

You could have a problem with the wheels themselves...but it is rare.