When I press the brake pedal, the front end shakes a lot.
I have seen this many times before. Warped rotors are a common issue. The rotors are a machined metal surface that the brake pads ride on. If this surface gets warped the vibrating/pulsating sensation when you brake is how it manifest itself. The repair is pretty simple. If your rotors still have plenty of metal on them, they can be machined straight again. If they have been machined before and are too thin at this point, rotor replacement may be necessary. Get a mechanic, such as one from YourMechanic, to help you determine if the rotors are still within machining thickness or if they need to be replaced.
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