When your car is squeaking when driving but stops squeaking when you brake it could be because your brake calipers are not releasing fully and allowing your brake pads to rub up against the rotors.
Or you could have worn brake pads and the squealing or squeak could be caused by the brake pad wear indicator that is alerting you to the worn brake pads.
When your brake pads get worn out the brake pad wear indicator rubs constantly against the brake rotors when you're not braking and it will continue to squeak or squeal as you drive.
So get your brake pads checked out and also your brake rotors could also be warped as well.
If the squeaking noise is going away when you stop the vehicle but continues when you release the brake pedal and drive down the road then it's very likely it's the brake pad wear indicators.
Or it could be the shocks when you're driving down the road.
Bad shocks can make a car squeak especially when you go over bumps or are driving down rough roads.
If your car is bouncing when you go over rough roads or speed bumps and the car is squealing then the shocks could be at fault.
A good way to see if the shocks are causing the car to squeak is to push down on the back of the car and see if it goes down easily and then squeaks as you push down on the car.
if the car is squeaking when you push down on the car over and over then it could be the shocks going bad.
Another cause of a car squeaking is bad struts or something rubbing up against the wheel or rubbing when the vehicle is bouncing.
Other causes of a car squeaking are worn ball joints or worn bushings even in the shocks.