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It sounds like your front pads have worn out or close to it. 70% of braking is done on the front wheels. Alternatively the front calipers may be seized.
The brakes would benefit from a strip, clean out with brake cleaner & a good brush, then re-assembly using a copper based grease on the back of the pads (maybe replace them if below half left) also smear the same copper based grease on any part the metal backing of the pad that touches the caliper, but NOT THE DISC OR BRAKE PAD SURFACE!
If you are unsure, dont attempt it, leave it to a professional. Depending on condition it may also be sensible to replace the disc rotors themselves too...