Altima, Frontier 3.3L, Maxima, Pathfinder 2WD, QX4 2WD, Sentra & Xterra

Raise and support vehicle. On Frontier, Pathfinder, QX4 and Xterra, remove front left tire. On all models, using 2 pressure gauges, attach one to a front brake bleeder and one to a rear brake bleeder. Bleed air from front and rear pressure gauges. Depress brake pedal slowly until front brake pressure reading is achieved. Check rear brake pressure. See PROPORTIONING VALVE PRESSURE SPECIFICATIONS  table. If not within specification, replace dual proportioning valve (separated type) or master cylinder assembly (built-in type).