sorry for my bad english, i will try to explain it:

i have a 2010 rx350 that when i shut off my car, the car moves back and forth a little

is normal? are the parking brakes bad?

thanks

 

A little movement in P is normal. Try setting the parking brake. It should not move then.

 

I agree. Very normal.

 

with your foot firmly pressed onto the brake, go from "D" or "R" to "N", apply parking brake, let go the brake, make sure no movement, with your foot again firmly pressed onto the brake, go from "N" to "P", then shut off engine

*when parking brake is applied in "N" and your car rolls even just a little bit, it's time to have the parking brake adjusted