Brakes lockin up on 00 Elantra

[VGB004]

Any brake experts out there can give me some help on my problem? Just recently my brakes started 2 lock up and losen up every now and then when I drive. SOmetimes when I park and get out there's a burning break smell. Anyone got a clue holla back asap. Its starting to become unsafe for me 2 drive cause the car even slugs along when this is happening. -VgB, Amp AVANTE