Applying the brakes.
brakes, or no sun
Applying the brakes with your foot!
Good question. You may have an antilock brake circuit that is not sensing the brakes correctly and improperly correcting. Anti lock pulses the brakes when you apply them. I don't know if this is perfected or not.
yes
warped rotors(brakes)...most likely front ones
STICKING BRAKE CALIPER
If the steering wheel shakes, but to car doesn't, when applying brakes - your front rotors are warped (if you have disc brakes)...if you have drum brakes, the drum could be cracked or the pads worn unevenly If the whole car shakes, and the steering wheel only seems to react to that, when applying brakes - see above statement, but apply to the rear end. If the whole car shakes, including the steering wheel - all four corners are bad, and you're an accident looking for a place to happen soon. In any case, go to your nearest service center ASAP.
You increase the frictional force by applying the brakes.
Vibration when applying brakes is most likely warped rotors. Another cause could be loose caliper bolts.
I would advise bringing your car to a mechanic as quickly as possible. Your brakes could fail. This puts you at a high risk for injury or even death.
it could be that your brakes are dirty or that you need new pads