after changing rotors
2 wheel or 4 wheel drive, front or rear rotors, it makes a big difference.
Before-a bad alignment cannot "unbalance" a wheel, but an unbalanced wheel, if bad enough, can throw off an alignment.
Whistling at low speeds tends to indicate worn wheel bearings.
Are you sure the rotors are responsible? Check for tires out of round, or poor wheel balancing. Also check thrust angle on wheel alignment. Any of these can also cause shaking.
It could be the rotors are getting bad, and it also could be the car's wheel alignment.
Three things to check, Wheel balance, Alignment, or most likely the front rotors may be slightly warped.
You "CAN" but even old tires that look good can cause all sorts of trouble that feel like alignment problems. The alignment shop is going to recomend changing them.
Your driveline may need alignment (front end alignment), you may have warped rotors, or you could have bad "ball joints".
If you are changing the rims yes you will need it checked. If you are just changing over a tyre it isn't essential and most probably will still be balanced.
I called MIDAS, for front 2 wheel alignment after changing steering rack. its cost CAD$69plus tax. I would say around $100.
No, you do not need new tires to get a wheel alignment. Wheel alignment can be performed on existing tires, regardless of their condition, as long as they are not excessively worn or damaged. However, if your tires are significantly worn, it might be a good idea to replace them before or shortly after an alignment to ensure optimal performance and safety.
You will find that the front brake rotors are located behind the front of your wheel spindle, (behind your wheel and brakes). There you will see the rotors.