Your car has rear DISC BRAKES that require NO ADJUSTMENT.
Does the pedal tighten up at all when you press it down, or does it go to the floor with little or no effort. If it requires little or no effort and does not tighten up as you get lower, then its likely a broken cable.
If the pedal gets tighter as it is depressed then it would appear that the cable itself has become stretched and needs to be adjusted. There is an adjustment bolt along the cable where it splits between the two wheels, its a pretty easy, quick fix assuming the adjuster is not rusted completely solid.
A respectable mechanic should adjust the cable for a measly 20-30 bucks as well
2002 Nissan Maxima SE - 15.143 at 91.74mph - Short Ram Intake - 2* Timing Advance- Tein Coilovers - Front Strut Brace
00-01 SE Tails - Smoked side markers - Painted and Cleared Headlights - Weathertech rainguards - Tinted to 27% - CF Gauge Trim
Stereo: Eclipse CD8445 - Kenwood KAC7201 - Kenwood KAC-729s - Cadence Components - 2x MB Quart Reference 12s
2000 Bonneville SE - Retired