Possibly a rotor scored badly or warped from overheating, maybe a piston that's sticking. Either way, essential to strip the front brakes and check everything.
not usually. warped rotors will cause a vibration during braking.
The shuddering could be caused by several things. Check the front end parts on the Fiesta to start with. A loose or worn part is the most likely cause of the problem.
Your rotors are probably warped from getting hot during braking and need to be "turned" or replaced. I suggest you take it to a brake shop or dealer.
warped rotor
replace front brake rotors and pads.
My first guess would be the front end alignment and possibly the brakes. During braking, you engine and transmission are not under a load so they should not cause any vibration.
When a front differential goes bad, you may notice symptoms such as loud noises coming from the front end, difficulty steering, vibrations, or the vehicle may feel like it's slipping or shuddering during turns. It is important to address these issues promptly to avoid further damage to the drivetrain.
Warped rotors
realignment, 60 to 80 bucks
Get you front end aligned, that should take care of the shakes.
the brake rotars are out of round or warped.have them machined
Yes, a bad wheel bearing can cause the front end to shake while braking. When a wheel bearing is worn or damaged, it can lead to increased play in the wheel assembly, which may result in vibrations or shaking, especially under the stress of braking. This shaking can also be exacerbated by other issues, such as warped brake rotors or misaligned wheels, so it's important to have the entire braking and suspension system inspected.