I have a 2006 Ford Focus wagon. The front brakes and rotors were replaced. The brake pedal feels "squishy" and in stop and go traffic, twice, while stopped, with my foot on the pedal, the pedal went right down to the floor... any suggestions?

first replace master cylinder the replace rear wheel brake cylinders.. Inspect front pads for non uniform wear, inspect front rotors replace if badly worn or scarred. You are dealing with 23-24 year old parts.

If it shakes while applying the brake I would say you have a warped rotor on the front

are your rotors still in spec and it could still be a faulty r/f caliper if it is a reman caliper vs oem

saw your other post and thought you just let it go for 2 years.
did they change the rotors? an imperfection in the rotor can cause it to make a noise, you would think that the first mechanic would have changed out the rotors and pads to rule it out, i doubt it would be the caliper because it is not close enough, did they check the bearing and axle?

if you feel a pulsation in pedal when stopping. its a warped brake rotor.

Sounds like you need a brake job. I would replace the front pads and front rotors and that should take care of the problem.

will try to help. when front wheels shake while applying brakes and you can feel shake in steering wheel, front brakes and rotors need replacement.rotors are warped,if you replace front brake pads, it will return[shaking when you apply brakes] suggest that you replace front rotors[both] replace [both]front brake pads. cost? i would charge [brake pads cost $55.00] labor,$60.00] total $115.00 thank you for choosing fixya.com

Did you turn the rotors? Drivers that drive fast, brake hard and hold the pedal down hard after stopping will warp these small rotors.

check balance of tires; if ok, have rotors refinished or replaced; most likely warped rotors if you can feel it in the brake pedal when braking

You have to remove the air trapped in the hydraulic system. Look at change of brakefluid in a repair handbook and perform it as described.

Useful to change the brakefluid at least once every five years anyway.